pkg/analyzer/test/generated/patterns_parser_test.dart

// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analyzer/src/dart/error/syntactic_errors.dart';
import 'package:analyzer/src/test_utilities/find_node.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../src/dart/resolution/node_text_expectations.dart';
import '../src/diagnostics/parser_diagnostics.dart';
import 'test_support.dart';

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(PatternsTest);
    defineReflectiveTests(UpdateNodeTextExpectations);
  });
}

@reflectiveTest
class PatternsTest extends ParserDiagnosticsTest {
  late FindNode findNode;

  test_caseHead_withClassicPattern_guarded_insideIfElement() {
    _parse('''
void f(x) {
  <int>[if (x case 0 when true) 1];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
''');
  }

  test_caseHead_withClassicPattern_guarded_insideIfElement_hasElse() {
    _parse('''
void f(x) {
  <int>[if (x case 0 when true) 1 else 2];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
  elseKeyword: else
  elseElement: IntegerLiteral
    literal: 2
''');
  }

  test_caseHead_withClassicPattern_guarded_insideIfStatement() {
    _parse('''
void f(x) {
  if (x case 0 when true) {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_caseHead_withClassicPattern_guarded_insideIfStatement_hasElse() {
    _parse('''
void f(x) {
  if (x case 0 when true) {} else {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
  elseKeyword: else
  elseStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_caseHead_withClassicPattern_guarded_insideSwitchStatement() {
    _parse('''
void f(x) {
  switch (x) {
    case 0 when true:
      break;
  }
}
''');
    var node = findNode.switchPatternCase('case');
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 0
    whenClause: WhenClause
      whenKeyword: when
      expression: BooleanLiteral
        literal: true
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_caseHead_withClassicPattern_unguarded_insideIfElement() {
    _parse('''
void f(x) {
  <int>[if (x case 0) 1];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
''');
  }

  test_caseHead_withClassicPattern_unguarded_insideIfElement_hasElse() {
    _parse('''
void f(x) {
  <int>[if (x case 0) 1 else 2];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
  elseKeyword: else
  elseElement: IntegerLiteral
    literal: 2
''');
  }

  test_caseHead_withClassicPattern_unguarded_insideIfStatement() {
    _parse('''
void f(x) {
  if (x case 0) {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_caseHead_withClassicPattern_unguarded_insideSwitchStatement() {
    _parse('''
void f(x) {
  switch (x) {
    case 0:
      break;
  }
}
''');
    var node = findNode.switchPatternCase('case');
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 0
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_caseHead_withNewPattern_guarded_insideIfElement() {
    _parse('''
void f(x) {
  <int>[if (x case 0 as int when true) 1];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
''');
  }

  test_caseHead_withNewPattern_guarded_insideIfElement_hasElse() {
    _parse('''
void f(x) {
  <int>[if (x case 0 as int when true) 1 else 2];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
  elseKeyword: else
  elseElement: IntegerLiteral
    literal: 2
''');
  }

  test_caseHead_withNewPattern_guarded_insideIfStatement() {
    _parse('''
void f(x) {
  if (x case 0 as int when true) {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
      whenClause: WhenClause
        whenKeyword: when
        expression: BooleanLiteral
          literal: true
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_caseHead_withNewPattern_guarded_insideSwitchStatement() {
    _parse('''
void f(x) {
  switch (x) {
    case 0 as int when true:
      break;
  }
}
''');
    var node = findNode.switchPatternCase('case');
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: CastPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      asToken: as
      type: NamedType
        name: SimpleIdentifier
          token: int
    whenClause: WhenClause
      whenKeyword: when
      expression: BooleanLiteral
        literal: true
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_caseHead_withNewPattern_unguarded_insideIfElement() {
    _parse('''
void f(x) {
  <int>[if (x case 0 as int) 1];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
''');
  }

  test_caseHead_withNewPattern_unguarded_insideIfElement_hasElse() {
    _parse('''
void f(x) {
  <int>[if (x case 0 as int) 1 else 2];
}
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 1
  elseKeyword: else
  elseElement: IntegerLiteral
    literal: 2
''');
  }

  test_caseHead_withNewPattern_unguarded_insideIfStatement() {
    _parse('''
void f(x) {
  if (x case 0 as int) {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 0
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_caseHead_withNewPattern_unguarded_insideSwitchStatement() {
    _parse('''
void f(x) {
  switch (x) {
    case 0 as int:
      break;
  }
}
''');
    var node = findNode.switchPatternCase('case');
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: CastPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 0
      asToken: as
      type: NamedType
        name: SimpleIdentifier
          token: int
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_cast_insideCase() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y as int:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: SimpleIdentifier
      token: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: int
''');
  }

  test_cast_insideIfCase() {
    _parse('''
void f(x) {
  if (x case var y as int) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: CastPattern
      pattern: VariablePattern
        keyword: var
        name: y
      asToken: as
      type: NamedType
        name: SimpleIdentifier
          token: int
''');
  }

  test_cast_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [1 as int]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    CastPattern
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 1
      asToken: as
      type: NamedType
        name: SimpleIdentifier
          token: int
  rightBracket: ]
''');
  }

  test_cast_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ as double? && Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: CastPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
        question: ?
      name: _
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: double
      question: ?
  operator: &&
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
    name: _
''');
  }

  test_cast_insideLogicalAnd_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ && double? _ as Object?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
      question: ?
    name: _
  operator: &&
  rightOperand: CastPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
''');
  }

  test_cast_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ as double? || Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: CastPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
        question: ?
      name: _
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: double
      question: ?
  operator: ||
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
    name: _
''');
  }

  test_cast_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ || double? _ as Object?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
      question: ?
    name: _
  operator: ||
  rightOperand: CastPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
''');
  }

  test_cast_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1 as int}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightBracket: }
''');
  }

  test_cast_insideObject_explicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1 as int):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: f
        colon: :
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightParenthesis: )
''');
  }

  test_cast_insideObject_implicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(: var f as int):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: CastPattern
        pattern: VariablePattern
          keyword: var
          name: f
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
  rightParenthesis: )
''');
  }

  test_cast_insideParenthesized() {
    _parse('''
void f(x) {
  switch (x) {
    case (1 as int):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: CastPattern
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: int
  rightParenthesis: )
''');
  }

  test_cast_insideRecord_explicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (n: 1 as int, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: n
        colon: :
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_cast_insideRecord_implicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (: var n as int, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: CastPattern
        pattern: VariablePattern
          keyword: var
          name: n
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_cast_insideRecord_unnamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (1 as int, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: CastPattern
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        asToken: as
        type: NamedType
          name: SimpleIdentifier
            token: int
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_constant_identifier_doublyPrefixed_builtin() {
    _parse('''
void f(x) {
  const y = abstract.as.get; // verify that this works
  switch (x) {
    case abstract.as.get:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PropertyAccess
    target: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: abstract
      period: .
      identifier: SimpleIdentifier
        token: as
    operator: .
    propertyName: SimpleIdentifier
      token: get
''');
  }

  test_constant_identifier_doublyPrefixed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b.c:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PropertyAccess
    target: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: a
      period: .
      identifier: SimpleIdentifier
        token: b
    operator: .
    propertyName: SimpleIdentifier
      token: c
''');
  }

  test_constant_identifier_doublyPrefixed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b.c as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: PropertyAccess
      target: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: a
        period: .
        identifier: SimpleIdentifier
          token: b
      operator: .
      propertyName: SimpleIdentifier
        token: c
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_identifier_doublyPrefixed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case a.b.c) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: PropertyAccess
        target: PrefixedIdentifier
          prefix: SimpleIdentifier
            token: a
          period: .
          identifier: SimpleIdentifier
            token: b
        operator: .
        propertyName: SimpleIdentifier
          token: c
''');
  }

  test_constant_identifier_doublyPrefixed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b.c!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: PropertyAccess
      target: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: a
        period: .
        identifier: SimpleIdentifier
          token: b
      operator: .
      propertyName: SimpleIdentifier
        token: c
  operator: !
''');
  }

  test_constant_identifier_doublyPrefixed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b.c?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: PropertyAccess
      target: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: a
        period: .
        identifier: SimpleIdentifier
          token: b
      operator: .
      propertyName: SimpleIdentifier
        token: c
  operator: ?
''');
  }

  test_constant_identifier_doublyPrefixed_pseudoKeyword() {
    _parse('''
void f(x) {
  const y = show.hide.when; // verify that this works
  switch (x) {
    case show.hide.when:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PropertyAccess
    target: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: show
      period: .
      identifier: SimpleIdentifier
        token: hide
    operator: .
    propertyName: SimpleIdentifier
      token: when
''');
  }

  test_constant_identifier_prefixed_builtin() {
    _parse('''
void f(x) {
  const y = abstract.as; // verify that this works
  switch (x) {
    case abstract.as:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PrefixedIdentifier
    prefix: SimpleIdentifier
      token: abstract
    period: .
    identifier: SimpleIdentifier
      token: as
''');
  }

  test_constant_identifier_prefixed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PrefixedIdentifier
    prefix: SimpleIdentifier
      token: a
    period: .
    identifier: SimpleIdentifier
      token: b
''');
  }

  test_constant_identifier_prefixed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: a
      period: .
      identifier: SimpleIdentifier
        token: b
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_identifier_prefixed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case a.b) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: a
        period: .
        identifier: SimpleIdentifier
          token: b
''');
  }

  test_constant_identifier_prefixed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: a
      period: .
      identifier: SimpleIdentifier
        token: b
  operator: !
''');
  }

  test_constant_identifier_prefixed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case a.b?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: a
      period: .
      identifier: SimpleIdentifier
        token: b
  operator: ?
''');
  }

  test_constant_identifier_prefixed_pseudoKeyword() {
    _parse('''
void f(x) {
  const y = show.hide; // verify that this works
  switch (x) {
    case show.hide:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PrefixedIdentifier
    prefix: SimpleIdentifier
      token: show
    period: .
    identifier: SimpleIdentifier
      token: hide
''');
  }

  test_constant_identifier_prefixedWithUnderscore_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _.b:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: PrefixedIdentifier
    prefix: SimpleIdentifier
      token: _
    period: .
    identifier: SimpleIdentifier
      token: b
''');
  }

  test_constant_identifier_unprefixed_beforeWhen() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y when true:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: ConstantPattern
    expression: SimpleIdentifier
      token: y
  whenClause: WhenClause
    whenKeyword: when
    expression: BooleanLiteral
      literal: true
''');
  }

  test_constant_identifier_unprefixed_builtin() {
    _parse('''
void f(x) {
  const y = abstract; // verify that this works
  switch (x) {
    case abstract:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: SimpleIdentifier
    token: abstract
''');
  }

  test_constant_identifier_unprefixed_insideCase() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: SimpleIdentifier
    token: y
''');
  }

  test_constant_identifier_unprefixed_insideCast() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: SimpleIdentifier
      token: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_identifier_unprefixed_insideIfCase() {
    _parse('''
void f(x) {
  const y = 1;
  if (x case y) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: SimpleIdentifier
        token: y
''');
  }

  test_constant_identifier_unprefixed_insideNullAssert() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleIdentifier
      token: y
  operator: !
''');
  }

  test_constant_identifier_unprefixed_insideNullCheck() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleIdentifier
      token: y
  operator: ?
''');
  }

  test_constant_identifier_unprefixed_insideSwitchExpression() {
    _parse('''
f(x) => switch (x) {
  y => 0
};
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: SimpleIdentifier
    token: y
''');
  }

  test_constant_identifier_unprefixed_pseudoKeyword() {
    _parse('''
void f(x) {
  const y = show; // verify that this works
  switch (x) {
    case show:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: SimpleIdentifier
    token: show
''');
  }

  test_constant_list_typed_empty_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: ListLiteral
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
    leftBracket: [
    rightBracket: ]
''');
  }

  test_constant_list_typed_empty_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[] as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      rightBracket: ]
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_list_typed_empty_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const <int>[]) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: ListLiteral
        typeArguments: TypeArgumentList
          leftBracket: <
          arguments
            NamedType
              name: SimpleIdentifier
                token: int
          rightBracket: >
        leftBracket: [
        rightBracket: ]
''');
  }

  test_constant_list_typed_empty_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[]!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      rightBracket: ]
  operator: !
''');
  }

  test_constant_list_typed_empty_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[]?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      rightBracket: ]
  operator: ?
''');
  }

  test_constant_list_typed_nonEmpty_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[1]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: ListLiteral
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
    leftBracket: [
    elements
      IntegerLiteral
        literal: 1
    rightBracket: ]
''');
  }

  test_constant_list_typed_nonEmpty_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[1] as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_list_typed_nonEmpty_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const <int>[1]) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: ListLiteral
        typeArguments: TypeArgumentList
          leftBracket: <
          arguments
            NamedType
              name: SimpleIdentifier
                token: int
          rightBracket: >
        leftBracket: [
        elements
          IntegerLiteral
            literal: 1
        rightBracket: ]
''');
  }

  test_constant_list_typed_nonEmpty_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[1]!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  operator: !
''');
  }

  test_constant_list_typed_nonEmpty_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>[1]?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  operator: ?
''');
  }

  test_constant_list_untyped_empty_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const []:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: ListLiteral
    leftBracket: [
    rightBracket: ]
''');
  }

  test_constant_list_untyped_empty_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const [] as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      rightBracket: ]
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_list_untyped_empty_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const []) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: ListLiteral
        leftBracket: [
        rightBracket: ]
''');
  }

  test_constant_list_untyped_empty_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const []!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      rightBracket: ]
  operator: !
''');
  }

  test_constant_list_untyped_empty_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const []?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      rightBracket: ]
  operator: ?
''');
  }

  test_constant_list_untyped_nonEmpty_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const [1]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: ListLiteral
    leftBracket: [
    elements
      IntegerLiteral
        literal: 1
    rightBracket: ]
''');
  }

  test_constant_list_untyped_nonEmpty_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const [1] as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_list_untyped_nonEmpty_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const [1]) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: ListLiteral
        leftBracket: [
        elements
          IntegerLiteral
            literal: 1
        rightBracket: ]
''');
  }

  test_constant_list_untyped_nonEmpty_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const [1]!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  operator: !
''');
  }

  test_constant_list_untyped_nonEmpty_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const [1]?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ListLiteral
      leftBracket: [
      elements
        IntegerLiteral
          literal: 1
      rightBracket: ]
  operator: ?
''');
  }

  test_constant_map_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int, int>{1: 2}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: SetOrMapLiteral
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
    leftBracket: {
    elements
      SetOrMapLiteral
        key: IntegerLiteral
          literal: 1
        separator: :
        value: IntegerLiteral
          literal: 2
    rightBracket: }
    isMap: false
''');
  }

  test_constant_map_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int, int>{1: 2} as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_map_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const <int, int>{1: 2}) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: SetOrMapLiteral
        typeArguments: TypeArgumentList
          leftBracket: <
          arguments
            NamedType
              name: SimpleIdentifier
                token: int
            NamedType
              name: SimpleIdentifier
                token: int
          rightBracket: >
        leftBracket: {
        elements
          SetOrMapLiteral
            key: IntegerLiteral
              literal: 1
            separator: :
            value: IntegerLiteral
              literal: 2
        rightBracket: }
        isMap: false
''');
  }

  test_constant_map_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int, int>{1: 2}!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  operator: !
''');
  }

  test_constant_map_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int, int>{1: 2}?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  operator: ?
''');
  }

  test_constant_map_untyped_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1: 2}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: SetOrMapLiteral
    leftBracket: {
    elements
      SetOrMapLiteral
        key: IntegerLiteral
          literal: 1
        separator: :
        value: IntegerLiteral
          literal: 2
    rightBracket: }
    isMap: false
''');
  }

  test_constant_map_untyped_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1: 2} as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_map_untyped_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const {1: 2}) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: SetOrMapLiteral
        leftBracket: {
        elements
          SetOrMapLiteral
            key: IntegerLiteral
              literal: 1
            separator: :
            value: IntegerLiteral
              literal: 2
        rightBracket: }
        isMap: false
''');
  }

  test_constant_map_untyped_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1: 2}!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  operator: !
''');
  }

  test_constant_map_untyped_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1: 2}?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        SetOrMapLiteral
          key: IntegerLiteral
            literal: 1
          separator: :
          value: IntegerLiteral
            literal: 2
      rightBracket: }
      isMap: false
  operator: ?
''');
  }

  test_constant_objectExpression_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const Foo(1):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: MethodInvocation
    methodName: SimpleIdentifier
      token: Foo
    argumentList: ArgumentList
      leftParenthesis: (
      arguments
        IntegerLiteral
          literal: 1
      rightParenthesis: )
''');
  }

  test_constant_objectExpression_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const Foo(1) as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: MethodInvocation
      methodName: SimpleIdentifier
        token: Foo
      argumentList: ArgumentList
        leftParenthesis: (
        arguments
          IntegerLiteral
            literal: 1
        rightParenthesis: )
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_objectExpression_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const Foo(1)) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: MethodInvocation
        methodName: SimpleIdentifier
          token: Foo
        argumentList: ArgumentList
          leftParenthesis: (
          arguments
            IntegerLiteral
              literal: 1
          rightParenthesis: )
''');
  }

  test_constant_objectExpression_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const Foo(1)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: MethodInvocation
      methodName: SimpleIdentifier
        token: Foo
      argumentList: ArgumentList
        leftParenthesis: (
        arguments
          IntegerLiteral
            literal: 1
        rightParenthesis: )
  operator: !
''');
  }

  test_constant_objectExpression_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const Foo(1)?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: MethodInvocation
      methodName: SimpleIdentifier
        token: Foo
      argumentList: ArgumentList
        leftParenthesis: (
        arguments
          IntegerLiteral
            literal: 1
        rightParenthesis: )
  operator: ?
''');
  }

  test_constant_parenthesized_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const (1):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: ParenthesizedExpression
    leftParenthesis: (
    expression: IntegerLiteral
      literal: 1
    rightParenthesis: )
''');
  }

  test_constant_parenthesized_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const (1) as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: ParenthesizedExpression
      leftParenthesis: (
      expression: IntegerLiteral
        literal: 1
      rightParenthesis: )
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_parenthesized_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const (1)) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: ParenthesizedExpression
        leftParenthesis: (
        expression: IntegerLiteral
          literal: 1
        rightParenthesis: )
''');
  }

  test_constant_parenthesized_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const (1)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ParenthesizedExpression
      leftParenthesis: (
      expression: IntegerLiteral
        literal: 1
      rightParenthesis: )
  operator: !
''');
  }

  test_constant_parenthesized_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const (1)?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: ParenthesizedExpression
      leftParenthesis: (
      expression: IntegerLiteral
        literal: 1
      rightParenthesis: )
  operator: ?
''');
  }

  test_constant_set_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>{1}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: SetOrMapLiteral
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
    leftBracket: {
    elements
      IntegerLiteral
        literal: 1
    rightBracket: }
    isMap: false
''');
  }

  test_constant_set_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>{1} as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_set_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const <int>{1}) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: SetOrMapLiteral
        typeArguments: TypeArgumentList
          leftBracket: <
          arguments
            NamedType
              name: SimpleIdentifier
                token: int
          rightBracket: >
        leftBracket: {
        elements
          IntegerLiteral
            literal: 1
        rightBracket: }
        isMap: false
''');
  }

  test_constant_set_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>{1}!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  operator: !
''');
  }

  test_constant_set_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const <int>{1}?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  operator: ?
''');
  }

  test_constant_set_untyped_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  const: const
  expression: SetOrMapLiteral
    leftBracket: {
    elements
      IntegerLiteral
        literal: 1
    rightBracket: }
    isMap: false
''');
  }

  test_constant_set_untyped_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1} as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_constant_set_untyped_insideIfCase() {
    _parse('''
void f(x) {
  if (x case const {1}) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      const: const
      expression: SetOrMapLiteral
        leftBracket: {
        elements
          IntegerLiteral
            literal: 1
        rightBracket: }
        isMap: false
''');
  }

  test_constant_set_untyped_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1}!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  operator: !
''');
  }

  test_constant_set_untyped_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case const {1}?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    const: const
    expression: SetOrMapLiteral
      leftBracket: {
      elements
        IntegerLiteral
          literal: 1
      rightBracket: }
      isMap: false
  operator: ?
''');
  }

  test_errorRecovery_afterQuestionSuffixInExpression() {
    // Based on co19 test `Language/Expressions/Conditional/syntax_t06.dart`.
    // Even though we now support suffix `?` in patterns, we need to make sure
    // that a suffix `?` in an expression still causes the appropriate syntax
    // error.
    _parse('''
f() {
  try {
    true ?  : 2;
  } catch (e) {}
}
''', errors: [
      error(ParserErrorCode.MISSING_IDENTIFIER, 26, 1),
    ]);
  }

  test_functionExpression_allowed_afterSwitchExpression() {
    _parse('''
f(x) => switch(x) {} + () => 0;
''');
    var node = findNode.functionDeclaration('f');
    assertParsedNodeText(node, r'''
FunctionDeclaration
  name: f
  functionExpression: FunctionExpression
    parameters: FormalParameterList
      leftParenthesis: (
      parameter: SimpleFormalParameter
        name: x
      rightParenthesis: )
    body: ExpressionFunctionBody
      functionDefinition: =>
      expression: BinaryExpression
        leftOperand: SwitchExpression
          switchKeyword: switch
          leftParenthesis: (
          expression: SimpleIdentifier
            token: x
          rightParenthesis: )
          leftBracket: {
          rightBracket: }
        operator: +
        rightOperand: FunctionExpression
          parameters: FormalParameterList
            leftParenthesis: (
            rightParenthesis: )
          body: ExpressionFunctionBody
            functionDefinition: =>
            expression: IntegerLiteral
              literal: 0
      semicolon: ;
''');
  }

  test_functionExpression_allowed_insideIfCaseWhenClause_element() {
    _parse('''
f(x, y) => [if (x case _ when y + () => 0) 0];
''');
    var node = findNode.ifElement('if');
    assertParsedNodeText(node, r'''
IfElement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: VariablePattern
        name: _
      whenClause: WhenClause
        whenKeyword: when
        expression: BinaryExpression
          leftOperand: SimpleIdentifier
            token: y
          operator: +
          rightOperand: FunctionExpression
            parameters: FormalParameterList
              leftParenthesis: (
              rightParenthesis: )
            body: ExpressionFunctionBody
              functionDefinition: =>
              expression: IntegerLiteral
                literal: 0
  rightParenthesis: )
  thenElement: IntegerLiteral
    literal: 0
''');
  }

  test_functionExpression_allowed_insideIfCaseWhenClause_statement() {
    _parse('''
f(x, y) {
  if (x case _ when y + () => 0) {}
}
''');
    var node = findNode.ifStatement('if');
    assertParsedNodeText(node, r'''
IfStatement
  ifKeyword: if
  leftParenthesis: (
  condition: SimpleIdentifier
    token: x
  caseClause: CaseClause
    caseKeyword: case
    guardedPattern: GuardedPattern
      pattern: VariablePattern
        name: _
      whenClause: WhenClause
        whenKeyword: when
        expression: BinaryExpression
          leftOperand: SimpleIdentifier
            token: y
          operator: +
          rightOperand: FunctionExpression
            parameters: FormalParameterList
              leftParenthesis: (
              rightParenthesis: )
            body: ExpressionFunctionBody
              functionDefinition: =>
              expression: IntegerLiteral
                literal: 0
  rightParenthesis: )
  thenStatement: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_functionExpression_allowed_insideSwitchExpressionCase_guarded() {
    _parse('''
f(x) => switch(x) { _ when switch(x) { _ when true => () => 0 } => 0 };
''');
    var node = findNode.switchExpressionCase('() => 0');
    assertParsedNodeText(node, r'''
SwitchExpressionCase
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
    whenClause: WhenClause
      whenKeyword: when
      expression: BooleanLiteral
        literal: true
  arrow: =>
  expression: FunctionExpression
    parameters: FormalParameterList
      leftParenthesis: (
      rightParenthesis: )
    body: ExpressionFunctionBody
      functionDefinition: =>
      expression: IntegerLiteral
        literal: 0
''');
  }

  test_functionExpression_allowed_insideSwitchExpressionCase_unguarded() {
    _parse('''
f(x) => switch(x) { _ when switch(x) { _ => () => 0 } => 0 };
''');
    var node = findNode.switchExpressionCase('() => 0');
    assertParsedNodeText(node, r'''
SwitchExpressionCase
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
  arrow: =>
  expression: FunctionExpression
    parameters: FormalParameterList
      leftParenthesis: (
      rightParenthesis: )
    body: ExpressionFunctionBody
      functionDefinition: =>
      expression: IntegerLiteral
        literal: 0
''');
  }

  test_functionExpression_allowed_insideSwitchExpressionScrutinee() {
    _parse('''
f() => switch(() => 0) {};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, r'''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: FunctionExpression
    parameters: FormalParameterList
      leftParenthesis: (
      rightParenthesis: )
    body: ExpressionFunctionBody
      functionDefinition: =>
      expression: IntegerLiteral
        literal: 0
  rightParenthesis: )
  leftBracket: {
  rightBracket: }
''');
  }

  test_functionExpression_allowed_insideSwitchStatementInWhenClause() {
    _parse('''
f(x, y) {
  switch(x) {
    case _ when y + () => 0:
      break;
  }
}
''');
    var node = findNode.switchPatternCase('when');
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
    whenClause: WhenClause
      whenKeyword: when
      expression: BinaryExpression
        leftOperand: SimpleIdentifier
          token: y
        operator: +
        rightOperand: FunctionExpression
          parameters: FormalParameterList
            leftParenthesis: (
            rightParenthesis: )
          body: ExpressionFunctionBody
            functionDefinition: =>
            expression: IntegerLiteral
              literal: 0
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_functionExpression_disallowed_afterSwitchExpressionInWhenClause() {
    _parse('''
f(x) => switch(x) { _ when switch(x) {} + () => 0 };
''');
    var node = findNode.switchExpressionCase('when');
    assertParsedNodeText(node, r'''
SwitchExpressionCase
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
    whenClause: WhenClause
      whenKeyword: when
      expression: BinaryExpression
        leftOperand: SwitchExpression
          switchKeyword: switch
          leftParenthesis: (
          expression: SimpleIdentifier
            token: x
          rightParenthesis: )
          leftBracket: {
          rightBracket: }
        operator: +
        rightOperand: RecordLiteral
          leftParenthesis: (
          rightParenthesis: )
  arrow: =>
  expression: IntegerLiteral
    literal: 0
''');
  }

  test_functionExpression_disallowed_insideSwitchExpressionInWhenClause() {
    _parse('''
f(x, y) => switch(x) { _ when y + () => 0 };
''');
    var node = findNode.switchExpressionCase('when');
    assertParsedNodeText(node, r'''
SwitchExpressionCase
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
    whenClause: WhenClause
      whenKeyword: when
      expression: BinaryExpression
        leftOperand: SimpleIdentifier
          token: y
        operator: +
        rightOperand: RecordLiteral
          leftParenthesis: (
          rightParenthesis: )
  arrow: =>
  expression: IntegerLiteral
    literal: 0
''');
  }

  test_issue50591() {
    _parse('''
f(x, bool Function() a) => switch(x) {
  _ when a() => 0
};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, r'''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  cases
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          name: _
        whenClause: WhenClause
          whenKeyword: when
          expression: MethodInvocation
            methodName: SimpleIdentifier
              token: a
            argumentList: ArgumentList
              leftParenthesis: (
              rightParenthesis: )
      arrow: =>
      expression: IntegerLiteral
        literal: 0
  rightBracket: }
''');
  }

  test_list_insideAssignment_typed_nonEmpty() {
    _parse('''
void f(x) {
  <int>[a, b] = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: [
  elements
    VariablePattern
      name: a
    VariablePattern
      name: b
  rightBracket: ]
''');
  }

  test_list_insideAssignment_untyped_empty() {
    _parse('''
void f(x) {
  [] = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideAssignment_untyped_emptyWithWhitespace() {
    _parse('''
void f(x) {
  [ ] = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideAssignment_untyped_nonEmpty() {
    _parse('''
void f(x) {
  [a, b] = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    VariablePattern
      name: a
    VariablePattern
      name: b
  rightBracket: ]
''');
  }

  test_list_insideCase_typed_nonEmpty() {
    _parse('''
void f(x) {
  switch (x) {
    case <int>[1, 2]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: [
  elements
    ConstantPattern
      expression: IntegerLiteral
        literal: 1
    ConstantPattern
      expression: IntegerLiteral
        literal: 2
  rightBracket: ]
''');
  }

  test_list_insideCase_untyped_empty() {
    _parse('''
void f(x) {
  switch (x) {
    case []:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideCase_untyped_emptyWithWhitespace() {
    _parse('''
void f(x) {
  switch (x) {
    case [ ]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideCase_untyped_nonEmpty() {
    _parse('''
void f(x) {
  switch (x) {
    case [1, 2]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    ConstantPattern
      expression: IntegerLiteral
        literal: 1
    ConstantPattern
      expression: IntegerLiteral
        literal: 2
  rightBracket: ]
''');
  }

  test_list_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case [1] as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ListPattern
    leftBracket: [
    elements
      ConstantPattern
        expression: IntegerLiteral
          literal: 1
    rightBracket: ]
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_list_insideDeclaration_typed_nonEmpty() {
    _parse('''
void f(x) {
  var <int>[a, b] = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: [
  elements
    VariablePattern
      name: a
    VariablePattern
      name: b
  rightBracket: ]
''');
  }

  test_list_insideDeclaration_untyped_empty() {
    _parse('''
void f(x) {
  var [] = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideDeclaration_untyped_emptyWithWhitespace() {
    _parse('''
void f(x) {
  var [ ] = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  rightBracket: ]
''');
  }

  test_list_insideDeclaration_untyped_nonEmpty() {
    _parse('''
void f(x) {
  var [a, b] = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    VariablePattern
      name: a
    VariablePattern
      name: b
  rightBracket: ]
''');
  }

  test_list_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case [1]!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ListPattern
    leftBracket: [
    elements
      ConstantPattern
        expression: IntegerLiteral
          literal: 1
    rightBracket: ]
  operator: !
''');
  }

  test_list_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case [1]?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ListPattern
    leftBracket: [
    elements
      ConstantPattern
        expression: IntegerLiteral
          literal: 1
    rightBracket: ]
  operator: ?
''');
  }

  test_literal_boolean_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case true:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: BooleanLiteral
    literal: true
''');
  }

  test_literal_boolean_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case true as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: BooleanLiteral
      literal: true
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_literal_boolean_insideIfCase() {
    _parse('''
void f(x) {
  if (x case true) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: BooleanLiteral
        literal: true
''');
  }

  test_literal_boolean_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case true!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: BooleanLiteral
      literal: true
  operator: !
''');
  }

  test_literal_boolean_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case true?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: BooleanLiteral
      literal: true
  operator: ?
''');
  }

  test_literal_double_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case 1.0:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: DoubleLiteral
    literal: 1.0
''');
  }

  test_literal_double_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case 1.0 as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: DoubleLiteral
      literal: 1.0
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_literal_double_insideIfCase() {
    _parse('''
void f(x) {
  if (x case 1.0) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: DoubleLiteral
        literal: 1.0
''');
  }

  test_literal_double_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case 1.0!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: DoubleLiteral
      literal: 1.0
  operator: !
''');
  }

  test_literal_double_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case 1.0?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: DoubleLiteral
      literal: 1.0
  operator: ?
''');
  }

  test_literal_integer_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: IntegerLiteral
    literal: 1
''');
  }

  test_literal_integer_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_literal_integer_insideIfCase() {
    _parse('''
void f(x) {
  if (x case 1) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 1
''');
  }

  test_literal_integer_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case 1!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: !
''');
  }

  test_literal_integer_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case 1?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: ?
''');
  }

  test_literal_null_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case null:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: NullLiteral
    literal: null
''');
  }

  test_literal_null_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case null as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: NullLiteral
      literal: null
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_literal_null_insideIfCase() {
    _parse('''
void f(x) {
  if (x case null) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: NullLiteral
        literal: null
''');
  }

  test_literal_null_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case null!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: NullLiteral
      literal: null
  operator: !
''');
  }

  test_literal_null_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case null?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: NullLiteral
      literal: null
  operator: ?
''');
  }

  test_literal_string_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case "x":
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ConstantPattern
  expression: SimpleStringLiteral
    literal: "x"
''');
  }

  test_literal_string_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case "x" as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ConstantPattern
    expression: SimpleStringLiteral
      literal: "x"
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_literal_string_insideIfCase() {
    _parse('''
void f(x) {
  if (x case "x") {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: ConstantPattern
      expression: SimpleStringLiteral
        literal: "x"
''');
  }

  test_literal_string_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case "x"!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleStringLiteral
      literal: "x"
  operator: !
''');
  }

  test_literal_string_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case "x"?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleStringLiteral
      literal: "x"
  operator: ?
''');
  }

  test_logicalAnd_insideIfCase() {
    _parse('''
void f(x) {
  if (x case int? _ && double? _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: BinaryPattern
      leftOperand: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
          question: ?
        name: _
      operator: &&
      rightOperand: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: double
          question: ?
        name: _
''');
  }

  test_logicalAnd_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ && double? _ && Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: BinaryPattern
    leftOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
        question: ?
      name: _
    operator: &&
    rightOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
  operator: &&
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
    name: _
''');
  }

  test_logicalAnd_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ && double? _ || Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: BinaryPattern
    leftOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
        question: ?
      name: _
    operator: &&
    rightOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
  operator: ||
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
    name: _
''');
  }

  test_logicalAnd_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ || double? _ && Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
      question: ?
    name: _
  operator: ||
  rightOperand: BinaryPattern
    leftOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
    operator: &&
    rightOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: Object
        question: ?
      name: _
''');
  }

  test_logicalOr_insideIfCase() {
    _parse('''
void f(x) {
  if (x case int? _ || double? _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: BinaryPattern
      leftOperand: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
          question: ?
        name: _
      operator: ||
      rightOperand: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: double
          question: ?
        name: _
''');
  }

  test_logicalOr_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int? _ || double? _ || Object? _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: BinaryPattern
    leftOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
        question: ?
      name: _
    operator: ||
    rightOperand: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: double
        question: ?
      name: _
  operator: ||
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: Object
      question: ?
    name: _
''');
  }

  test_map_insideAssignment_typed_nonEmpty() {
    _parse('''
void f(x) {
  <String, int>{'a': a, 'b': b} = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: String
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        name: a
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: VariablePattern
        name: b
  rightBracket: }
''');
  }

  test_map_insideAssignment_untyped_empty() {
    // Note: statements aren't allowed to start with `{` so we need parens
    // around the assignment.  See
    // https://github.com/dart-lang/language/issues/2662.
    _parse('''
void f(x) {
  ({} = x);
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  rightBracket: }
''');
  }

  test_map_insideAssignment_untyped_empty_beginningOfStatement() {
    _parse('''
void f(x) {
  {} = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  rightBracket: }
''');
  }

  test_map_insideAssignment_untyped_nonEmpty() {
    // Note: statements aren't allowed to start with `{` so we need parens
    // around the assignment.  See
    // https://github.com/dart-lang/language/issues/2662.
    _parse('''
void f(x) {
  ({'a': a, 'b': b} = x);
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        name: a
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: VariablePattern
        name: b
  rightBracket: }
''');
  }

  test_map_insideAssignment_untyped_nonEmpty_beginningOfStatement() {
    _parse('''
void f(x) {
  {'a': a, 'b': b} = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        name: a
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: VariablePattern
        name: b
  rightBracket: }
''');
  }

  test_map_insideCase_typed_nonEmpty() {
    _parse('''
void f(x) {
  switch (x) {
    case <String, int>{'a': 1, 'b': 2}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: String
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: ConstantPattern
        expression: IntegerLiteral
          literal: 1
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightBracket: }
''');
  }

  test_map_insideCase_untyped_empty() {
    _parse('''
void f(x) {
  switch (x) {
    case {}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  rightBracket: }
''');
  }

  test_map_insideCase_untyped_nonEmpty() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1, 'b': 2}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: ConstantPattern
        expression: IntegerLiteral
          literal: 1
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightBracket: }
''');
  }

  test_map_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1} as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: MapPattern
    leftBracket: {
    elements
      MapPatternEntry
        key: SimpleStringLiteral
          literal: 'a'
        separator: :
        value: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightBracket: }
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_map_insideDeclaration_typed_nonEmpty() {
    _parse('''
void f(x) {
  var <String, int>{'a': a, 'b': b} = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  typeArguments: TypeArgumentList
    leftBracket: <
    arguments
      NamedType
        name: SimpleIdentifier
          token: String
      NamedType
        name: SimpleIdentifier
          token: int
    rightBracket: >
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        name: a
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: VariablePattern
        name: b
  rightBracket: }
''');
  }

  test_map_insideDeclaration_untyped_empty() {
    _parse('''
void f(x) {
  var {} = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  rightBracket: }
''');
  }

  test_map_insideDeclaration_untyped_nonEmpty() {
    _parse('''
void f(x) {
  var {'a': a, 'b': b} = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        name: a
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'b'
      separator: :
      value: VariablePattern
        name: b
  rightBracket: }
''');
  }

  test_map_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1}!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: MapPattern
    leftBracket: {
    elements
      MapPatternEntry
        key: SimpleStringLiteral
          literal: 'a'
        separator: :
        value: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightBracket: }
  operator: !
''');
  }

  test_map_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1}?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: MapPattern
    leftBracket: {
    elements
      MapPatternEntry
        key: SimpleStringLiteral
          literal: 'a'
        separator: :
        value: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightBracket: }
  operator: ?
''');
  }

  test_nullAssert_insideCase() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleIdentifier
      token: y
  operator: !
''');
  }

  test_nullAssert_insideIfCase() {
    _parse('''
void f(x) {
  if (x case var y!) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: PostfixPattern
      operand: VariablePattern
        keyword: var
        name: y
      operator: !
''');
  }

  test_nullAssert_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [1!]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    PostfixPattern
      operand: ConstantPattern
        expression: IntegerLiteral
          literal: 1
      operator: !
  rightBracket: ]
''');
  }

  test_nullAssert_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1! && 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: !
  operator: &&
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_nullAssert_insideLogicalAnd_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 && 2!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: &&
  rightOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 2
    operator: !
''');
  }

  test_nullAssert_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1! || 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: !
  operator: ||
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_nullAssert_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 || 2!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: ||
  rightOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 2
    operator: !
''');
  }

  test_nullAssert_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1!}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: !
  rightBracket: }
''');
  }

  test_nullAssert_insideObject_explicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1!):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: f
        colon: :
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: !
  rightParenthesis: )
''');
  }

  test_nullAssert_insideObject_implicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(: var f!):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: PostfixPattern
        operand: VariablePattern
          keyword: var
          name: f
        operator: !
  rightParenthesis: )
''');
  }

  test_nullAssert_insideParenthesized() {
    _parse('''
void f(x) {
  switch (x) {
    case (1!):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: !
  rightParenthesis: )
''');
  }

  test_nullAssert_insideRecord_explicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (n: 1!, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: n
        colon: :
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: !
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_nullAssert_insideRecord_implicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (: var n!, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: PostfixPattern
        operand: VariablePattern
          keyword: var
          name: n
        operator: !
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_nullAssert_insideRecord_unnamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (1!, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: !
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_nullCheck_insideCase() {
    _parse('''
void f(x) {
  const y = 1;
  switch (x) {
    case y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ConstantPattern
    expression: SimpleIdentifier
      token: y
  operator: ?
''');
  }

  test_nullCheck_insideIfCase() {
    _parse('''
void f(x) {
  if (x case var y?) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: PostfixPattern
      operand: VariablePattern
        keyword: var
        name: y
      operator: ?
''');
  }

  test_nullCheck_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [1?]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    PostfixPattern
      operand: ConstantPattern
        expression: IntegerLiteral
          literal: 1
      operator: ?
  rightBracket: ]
''');
  }

  test_nullCheck_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1? && 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: ?
  operator: &&
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_nullCheck_insideLogicalAnd_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 && 2?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: &&
  rightOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 2
    operator: ?
''');
  }

  test_nullCheck_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1? || 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: ?
  operator: ||
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_nullCheck_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 || 2?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: ||
  rightOperand: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 2
    operator: ?
''');
  }

  test_nullCheck_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': 1?}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: ?
  rightBracket: }
''');
  }

  test_nullCheck_insideObject_explicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1?):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: f
        colon: :
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: ?
  rightParenthesis: )
''');
  }

  test_nullCheck_insideObject_implicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(: var f?):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: PostfixPattern
        operand: VariablePattern
          keyword: var
          name: f
        operator: ?
  rightParenthesis: )
''');
  }

  test_nullCheck_insideParenthesized() {
    _parse('''
void f(x) {
  switch (x) {
    case (1?):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: PostfixPattern
    operand: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    operator: ?
  rightParenthesis: )
''');
  }

  test_nullCheck_insideRecord_explicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (n: 1?, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: n
        colon: :
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: ?
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_nullCheck_insideRecord_implicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (: var n?, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: PostfixPattern
        operand: VariablePattern
          keyword: var
          name: n
        operator: ?
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_nullCheck_insideRecord_unnamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (1?, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: PostfixPattern
        operand: ConstantPattern
          expression: IntegerLiteral
            literal: 1
        operator: ?
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_object_prefixed_withTypeArgs_insideAssignment() {
    _parse('''
void f(x) {
  async.Future<int>() = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: async
      period: .
      identifier: SimpleIdentifier
        token: Future
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_prefixed_withTypeArgs_insideCase() {
    _parse('''
import 'dart:async' as async;

void f(x) {
  switch (x) {
    case async.Future<int>():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: async
      period: .
      identifier: SimpleIdentifier
        token: Future
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_prefixed_withTypeArgs_insideCast() {
    _parse('''
import 'dart:async' as async;

void f(x) {
  switch (x) {
    case async.Future<int>() as Object:
      break;
  }
}
''');
    var node = findNode.switchPatternCase("async.Future<int>() as Object");
    assertParsedNodeText(node, r'''
SwitchPatternCase
  keyword: case
  guardedPattern: GuardedPattern
    pattern: CastPattern
      pattern: ObjectPattern
        type: NamedType
          name: PrefixedIdentifier
            prefix: SimpleIdentifier
              token: async
            period: .
            identifier: SimpleIdentifier
              token: Future
          typeArguments: TypeArgumentList
            leftBracket: <
            arguments
              NamedType
                name: SimpleIdentifier
                  token: int
            rightBracket: >
        leftParenthesis: (
        rightParenthesis: )
      asToken: as
      type: NamedType
        name: SimpleIdentifier
          token: Object
  colon: :
  statements
    BreakStatement
      breakKeyword: break
      semicolon: ;
''');
  }

  test_object_prefixed_withTypeArgs_insideDeclaration() {
    _parse('''
void f(x) {
  var async.Future<int>() = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: async
      period: .
      identifier: SimpleIdentifier
        token: Future
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_prefixed_withTypeArgs_insideNullAssert() {
    _parse('''
import 'dart:async' as async;

void f(x) {
  switch (x) {
    case async.Future<int>()!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ObjectPattern
    type: NamedType
      name: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: async
        period: .
        identifier: SimpleIdentifier
          token: Future
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
    leftParenthesis: (
    rightParenthesis: )
  operator: !
''');
  }

  test_object_prefixed_withTypeArgs_insideNullCheck() {
    _parse('''
import 'dart:async' as async;

void f(x) {
  switch (x) {
    case async.Future<int>()?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ObjectPattern
    type: NamedType
      name: PrefixedIdentifier
        prefix: SimpleIdentifier
          token: async
        period: .
        identifier: SimpleIdentifier
          token: Future
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
    leftParenthesis: (
    rightParenthesis: )
  operator: ?
''');
  }

  test_object_prefixedNamedUnderscore_withoutTypeArgs_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _.Future():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: _
      period: .
      identifier: SimpleIdentifier
        token: Future
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_prefixedNamedUnderscore_withoutTypeArgs_insideDeclaration() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  var _.Future() = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: _
      period: .
      identifier: SimpleIdentifier
        token: Future
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_prefixedNamedUnderscore_withTypeArgs_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _.Future<int>():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: PrefixedIdentifier
      prefix: SimpleIdentifier
        token: _
      period: .
      identifier: SimpleIdentifier
        token: Future
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixed_withoutTypeArgs_insideCast() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1) as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ObjectPattern
    type: NamedType
      name: SimpleIdentifier
        token: C
    leftParenthesis: (
    fields
      RecordPatternField
        fieldName: RecordPatternFieldName
          name: f
          colon: :
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightParenthesis: )
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_object_unprefixed_withoutTypeArgs_insideNullAssert() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ObjectPattern
    type: NamedType
      name: SimpleIdentifier
        token: C
    leftParenthesis: (
    fields
      RecordPatternField
        fieldName: RecordPatternFieldName
          name: f
          colon: :
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightParenthesis: )
  operator: !
''');
  }

  test_object_unprefixed_withoutTypeArgs_insideNullCheck() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: 1)?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ObjectPattern
    type: NamedType
      name: SimpleIdentifier
        token: C
    leftParenthesis: (
    fields
      RecordPatternField
        fieldName: RecordPatternFieldName
          name: f
          colon: :
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightParenthesis: )
  operator: ?
''');
  }

  test_object_unprefixed_withTypeArgs_insideCase() {
    _parse('''
class C<T> {}
void f(x) {
  switch (x) {
    case C<int>():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixed_withTypeArgs_insideDeclaration() {
    _parse('''
class C<T> {}
void f(x) {
  var C<int>() = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixed_withTypeArgs_insideNullAssert() {
    _parse('''
class C<T> {
  T? f;
}
void f(x) {
  switch (x) {
    case C<int>(f: 1)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ObjectPattern
    type: NamedType
      name: SimpleIdentifier
        token: C
      typeArguments: TypeArgumentList
        leftBracket: <
        arguments
          NamedType
            name: SimpleIdentifier
              token: int
        rightBracket: >
    leftParenthesis: (
    fields
      RecordPatternField
        fieldName: RecordPatternFieldName
          name: f
          colon: :
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
    rightParenthesis: )
  operator: !
''');
  }

  test_object_unprefixedNamedUnderscore_withoutTypeArgs_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: _
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixedNamedUnderscore_withoutTypeArgs_insideDeclaration() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  var _() = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: _
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixedNamedUnderscore_withTypeArgs_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _<int>():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: _
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_object_unprefixedNamedUnderscore_withTypeArgs_insideDeclaration() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  var _<int>() = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: _
    typeArguments: TypeArgumentList
      leftBracket: <
      arguments
        NamedType
          name: SimpleIdentifier
            token: int
      rightBracket: >
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_parenthesized_insideAssignment() {
    _parse('''
f(x) {
  (a) = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: VariablePattern
    name: a
  rightParenthesis: )
''');
  }

  test_parenthesized_insideCase() {
    _parse('''
f(x) {
  switch (x) {
    case (1):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  rightParenthesis: )
''');
  }

  test_parenthesized_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case (1) as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: ParenthesizedPattern
    leftParenthesis: (
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    rightParenthesis: )
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_parenthesized_insideDeclaration() {
    _parse('''
f(x) {
  var (a) = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: VariablePattern
    name: a
  rightParenthesis: )
''');
  }

  test_parenthesized_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case (1)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ParenthesizedPattern
    leftParenthesis: (
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    rightParenthesis: )
  operator: !
''');
  }

  test_parenthesized_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case (1)?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: ParenthesizedPattern
    leftParenthesis: (
    pattern: ConstantPattern
      expression: IntegerLiteral
        literal: 1
    rightParenthesis: )
  operator: ?
''');
  }

  test_pattern_inForInitializer_element() {
    _parse('''
void f(x) => [for (var (a, b) = x; ;) 0];
''');
    var node = findNode.forElement('for');
    assertParsedNodeText(node, r'''
ForElement
  forKeyword: for
  leftParenthesis: (
  forLoopParts: ForPartsWithPattern
    variables: PatternVariableDeclaration
      keyword: var
      pattern: RecordPattern
        leftParenthesis: (
        fields
          RecordPatternField
            pattern: VariablePattern
              name: a
          RecordPatternField
            pattern: VariablePattern
              name: b
        rightParenthesis: )
      equals: =
      expression: SimpleIdentifier
        token: x
    leftSeparator: ;
    rightSeparator: ;
  rightParenthesis: )
  body: IntegerLiteral
    literal: 0
''');
  }

  test_pattern_inForInitializer_statement() {
    _parse('''
void f(x) {
  for (var (a, b) = x; ;) {}
}
''');
    var node = findNode.forStatement('for');
    assertParsedNodeText(node, r'''
ForStatement
  forKeyword: for
  leftParenthesis: (
  forLoopParts: ForPartsWithPattern
    variables: PatternVariableDeclaration
      keyword: var
      pattern: RecordPattern
        leftParenthesis: (
        fields
          RecordPatternField
            pattern: VariablePattern
              name: a
          RecordPatternField
            pattern: VariablePattern
              name: b
        rightParenthesis: )
      equals: =
      expression: SimpleIdentifier
        token: x
    leftSeparator: ;
    rightSeparator: ;
  rightParenthesis: )
  body: Block
    leftBracket: {
    rightBracket: }
''');
  }

  test_patternVariableDeclarationStatement_disallowsLate() {
    // TODO(paulberry): do better error recovery.
    _parse('''
f(x) {
  late var (_) = x;
}
''', errors: [
      error(ParserErrorCode.MISSING_IDENTIFIER, 18, 1),
      error(ParserErrorCode.EXPECTED_TOKEN, 18, 1),
      error(ParserErrorCode.EXPECTED_TOKEN, 19, 1),
      error(ParserErrorCode.MISSING_IDENTIFIER, 20, 1),
      error(ParserErrorCode.UNEXPECTED_TOKEN, 20, 1),
      error(ParserErrorCode.MISSING_IDENTIFIER, 22, 1),
    ]);
  }

  test_patternVariableDeclarationStatement_noMetadata_final_extractor() {
    _parse('''
f(x) {
  final C(f: a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: final
    pattern: ObjectPattern
      type: NamedType
        name: SimpleIdentifier
          token: C
      leftParenthesis: (
      fields
        RecordPatternField
          fieldName: RecordPatternFieldName
            name: f
            colon: :
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_final_list() {
    _parse('''
f(x) {
  final [a] = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: final
    pattern: ListPattern
      leftBracket: [
      elements
        VariablePattern
          name: a
      rightBracket: ]
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_final_map() {
    _parse('''
f(x) {
  final {'a': a} = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: final
    pattern: MapPattern
      leftBracket: {
      elements
        MapPatternEntry
          key: SimpleStringLiteral
            literal: 'a'
          separator: :
          value: VariablePattern
            name: a
      rightBracket: }
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_final_parenthesized() {
    _parse('''
f(x) {
  final (a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: final
    pattern: ParenthesizedPattern
      leftParenthesis: (
      pattern: VariablePattern
        name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_final_record() {
    _parse('''
f(x) {
  final (a,) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: final
    pattern: RecordPattern
      leftParenthesis: (
      fields
        RecordPatternField
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_var_extractor() {
    _parse('''
f(x) {
  var C(f: a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: var
    pattern: ObjectPattern
      type: NamedType
        name: SimpleIdentifier
          token: C
      leftParenthesis: (
      fields
        RecordPatternField
          fieldName: RecordPatternFieldName
            name: f
            colon: :
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_var_list() {
    _parse('''
f(x) {
  var [a] = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: var
    pattern: ListPattern
      leftBracket: [
      elements
        VariablePattern
          name: a
      rightBracket: ]
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_var_map() {
    _parse('''
f(x) {
  var {'a': a} = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: var
    pattern: MapPattern
      leftBracket: {
      elements
        MapPatternEntry
          key: SimpleStringLiteral
            literal: 'a'
          separator: :
          value: VariablePattern
            name: a
      rightBracket: }
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_var_parenthesized() {
    _parse('''
f(x) {
  var (a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: var
    pattern: ParenthesizedPattern
      leftParenthesis: (
      pattern: VariablePattern
        name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_noMetadata_var_record() {
    _parse('''
f(x) {
  var (a,) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    keyword: var
    pattern: RecordPattern
      leftParenthesis: (
      fields
        RecordPatternField
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_final_extractor() {
    _parse('''
f(x) {
  @annotation
  final C(f: a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: final
    pattern: ObjectPattern
      type: NamedType
        name: SimpleIdentifier
          token: C
      leftParenthesis: (
      fields
        RecordPatternField
          fieldName: RecordPatternFieldName
            name: f
            colon: :
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_final_list() {
    _parse('''
f(x) {
  @annotation
  final [a] = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: final
    pattern: ListPattern
      leftBracket: [
      elements
        VariablePattern
          name: a
      rightBracket: ]
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_final_map() {
    _parse('''
f(x) {
  @annotation
  final {'a': a} = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: final
    pattern: MapPattern
      leftBracket: {
      elements
        MapPatternEntry
          key: SimpleStringLiteral
            literal: 'a'
          separator: :
          value: VariablePattern
            name: a
      rightBracket: }
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_final_parenthesized() {
    _parse('''
f(x) {
  @annotation
  final (a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: final
    pattern: ParenthesizedPattern
      leftParenthesis: (
      pattern: VariablePattern
        name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_final_record() {
    _parse('''
f(x) {
  @annotation
  final (a,) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: final
    pattern: RecordPattern
      leftParenthesis: (
      fields
        RecordPatternField
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_var_extractor() {
    _parse('''
f(x) {
  @annotation
  var C(f: a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: var
    pattern: ObjectPattern
      type: NamedType
        name: SimpleIdentifier
          token: C
      leftParenthesis: (
      fields
        RecordPatternField
          fieldName: RecordPatternFieldName
            name: f
            colon: :
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_var_list() {
    _parse('''
f(x) {
  @annotation
  var [a] = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: var
    pattern: ListPattern
      leftBracket: [
      elements
        VariablePattern
          name: a
      rightBracket: ]
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_var_map() {
    _parse('''
f(x) {
  @annotation
  var {'a': a} = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: var
    pattern: MapPattern
      leftBracket: {
      elements
        MapPatternEntry
          key: SimpleStringLiteral
            literal: 'a'
          separator: :
          value: VariablePattern
            name: a
      rightBracket: }
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_var_parenthesized() {
    _parse('''
f(x) {
  @annotation
  var (a) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: var
    pattern: ParenthesizedPattern
      leftParenthesis: (
      pattern: VariablePattern
        name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_patternVariableDeclarationStatement_withMetadata_var_record() {
    _parse('''
f(x) {
  @annotation
  var (a,) = x;
}
''');
    var node = findNode.patternVariableDeclarationStatement('= x');
    assertParsedNodeText(node, r'''
PatternVariableDeclarationStatement
  declaration: PatternVariableDeclaration
    metadata
      Annotation
        atSign: @
        name: SimpleIdentifier
          token: annotation
    keyword: var
    pattern: RecordPattern
      leftParenthesis: (
      fields
        RecordPatternField
          pattern: VariablePattern
            name: a
      rightParenthesis: )
    equals: =
    expression: SimpleIdentifier
      token: x
  semicolon: ;
''');
  }

  test_record_insideAssignment_empty() {
    _parse('''
void f(x) {
  () = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_record_insideAssignment_oneField() {
    _parse('''
void f(x) {
  (a,) = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: VariablePattern
        name: a
  rightParenthesis: )
''');
  }

  test_record_insideAssignment_twoFields() {
    _parse('''
void f(x) {
  (a, b) = x;
}
''');
    var node = findNode.patternAssignment('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: VariablePattern
        name: a
    RecordPatternField
      pattern: VariablePattern
        name: b
  rightParenthesis: )
''');
  }

  test_record_insideCase_empty() {
    _parse('''
void f(x) {
  switch (x) {
    case ():
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_record_insideCase_oneField() {
    _parse('''
void f(x) {
  switch (x) {
    case (1,):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 1
  rightParenthesis: )
''');
  }

  test_record_insideCase_twoFields() {
    _parse('''
void f(x) {
  switch (x) {
    case (1, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 1
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_record_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case (1, 2) as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: RecordPattern
    leftParenthesis: (
    fields
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 2
    rightParenthesis: )
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_record_insideDeclaration_empty() {
    _parse('''
void f(x) {
  var () = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  rightParenthesis: )
''');
  }

  test_record_insideDeclaration_oneField() {
    _parse('''
void f(x) {
  var (a,) = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: VariablePattern
        name: a
  rightParenthesis: )
''');
  }

  test_record_insideDeclaration_twoFields() {
    _parse('''
void f(x) {
  var (a, b) = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: VariablePattern
        name: a
    RecordPatternField
      pattern: VariablePattern
        name: b
  rightParenthesis: )
''');
  }

  test_record_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case (1, 2)!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: RecordPattern
    leftParenthesis: (
    fields
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 2
    rightParenthesis: )
  operator: !
''');
  }

  test_record_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case (1, 2)?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: RecordPattern
    leftParenthesis: (
    fields
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 1
      RecordPatternField
        pattern: ConstantPattern
          expression: IntegerLiteral
            literal: 2
    rightParenthesis: )
  operator: ?
''');
  }

  test_relational_insideCase_equal() {
    _parse('''
void f(x) {
  switch (x) {
    case == 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: ==
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideCase_greaterThan() {
    _parse('''
void f(x) {
  switch (x) {
    case > 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: >
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideCase_greaterThanOrEqual() {
    _parse('''
void f(x) {
  switch (x) {
    case >= 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: >=
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideCase_lessThan() {
    _parse('''
void f(x) {
  switch (x) {
    case < 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: <
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideCase_lessThanOrEqual() {
    _parse('''
void f(x) {
  switch (x) {
    case <= 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: <=
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideCase_notEqual() {
    _parse('''
void f(x) {
  switch (x) {
    case != 1 << 1:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RelationalPattern
  operator: !=
  operand: BinaryExpression
    leftOperand: IntegerLiteral
      literal: 1
    operator: <<
    rightOperand: IntegerLiteral
      literal: 1
''');
  }

  test_relational_insideIfCase() {
    _parse('''
void f(x) {
  if (x case == 1) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: RelationalPattern
      operator: ==
      operand: IntegerLiteral
        literal: 1
''');
  }

  test_relational_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [== 1]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    RelationalPattern
      operator: ==
      operand: IntegerLiteral
        literal: 1
  rightBracket: ]
''');
  }

  test_relational_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case == 1 && 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: RelationalPattern
    operator: ==
    operand: IntegerLiteral
      literal: 1
  operator: &&
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_relational_insideLogicalAnd_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 && == 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: &&
  rightOperand: RelationalPattern
    operator: ==
    operand: IntegerLiteral
      literal: 2
''');
  }

  test_relational_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case == 1 || 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: RelationalPattern
    operator: ==
    operand: IntegerLiteral
      literal: 1
  operator: ||
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_relational_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 || == 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: ||
  rightOperand: RelationalPattern
    operator: ==
    operand: IntegerLiteral
      literal: 2
''');
  }

  test_relational_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': == 1}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: RelationalPattern
        operator: ==
        operand: IntegerLiteral
          literal: 1
  rightBracket: }
''');
  }

  test_relational_insideObject_explicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: == 1):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: f
        colon: :
      pattern: RelationalPattern
        operator: ==
        operand: IntegerLiteral
          literal: 1
  rightParenthesis: )
''');
  }

  test_relational_insideParenthesized() {
    _parse('''
void f(x) {
  switch (x) {
    case (== 1):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: RelationalPattern
    operator: ==
    operand: IntegerLiteral
      literal: 1
  rightParenthesis: )
''');
  }

  test_relational_insideRecord_explicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (n: == 1, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: n
        colon: :
      pattern: RelationalPattern
        operator: ==
        operand: IntegerLiteral
          literal: 1
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_relational_insideRecord_unnamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (== 1, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: RelationalPattern
        operator: ==
        operand: IntegerLiteral
          literal: 1
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_rest_subpatternStartingTokens() {
    // Test a wide variety of rest subpatterns to make sure the parser properly
    // identifies each as a subpattern.  (The logic for deciding if a rest
    // pattern has a subpattern is based on the token that follows the `..`, so
    // we test every kind of token that can legally follow `...`).  Note that
    // not all of these are semantically meaningful, but they should all be
    // parseable.
    // TODO(paulberry): if support for symbol literal patterns is added (see
    // https://github.com/dart-lang/language/issues/2636), adjust this test
    // accordingly.
    _parse('''
void f(x) {
  switch (x) {
    case [...== null]:
    case [...!= null]:
    case [...< 0]:
    case [...> 0]:
    case [...<= 0]:
    case [...>= 0]:
    case [...0]:
    case [...0.0]:
    case [...0x0]:
    case [...null]:
    case [...false]:
    case [...true]:
    case [...'foo']:
    case [...x]:
    case [...const List()]:
    case [...var x]:
    case [...final x]:
    case [...List x]:
    case [..._]:
    case [...(_)]:
    case [...[_]]:
    case [...[]]:
    case [...<int>[]]:
    case [...{}]:
    case [...List()]:
      break;
  }
}
''');
    // No assertions; it's sufficient to make sure the parse succeeds without
    // errors.
  }

  test_rest_withoutSubpattern_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [...]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    RestPatternElement
      operator: ...
  rightBracket: ]
''');
  }

  test_rest_withoutSubpattern_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {...}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    RestPatternElement
      operator: ...
  rightBracket: }
''');
  }

  test_rest_withSubpattern_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [...var y]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    RestPatternElement
      operator: ...
      pattern: VariablePattern
        keyword: var
        name: y
  rightBracket: ]
''');
  }

  test_rest_withSubpattern_insideMap() {
    // The parser accepts this syntax even though it's not legal dart, because
    // we suspect it's a mistake a user is likely to make, and we want to ensure
    // that we give a helpful error message.
    _parse('''
void f(x) {
  switch (x) {
    case {...var y}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    RestPatternElement
      operator: ...
      pattern: VariablePattern
        keyword: var
        name: y
  rightBracket: }
''');
  }

  test_skipOuterPattern_eof() {
    // See https://github.com/dart-lang/sdk/issues/50563
    _parse('''
main() {
  int var = 0;
''', errors: [
      error(ParserErrorCode.EXPECTED_TOKEN, 11, 3),
      error(ParserErrorCode.MISSING_IDENTIFIER, 19, 1),
      error(ScannerErrorCode.EXPECTED_TOKEN, 24, 1),
    ]);
  }

  test_switchExpression_empty() {
    // Even though an empty switch expression is illegal (because it's not
    // exhaustive), it should be accepted by the parser to enable analyzer code
    // completions.
    _parse('''
f(x) => switch(x) {};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, '''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  rightBracket: }
''');
  }

  test_switchExpression_onePattern_guarded() {
    _parse('''
f(x) => switch(x) {
  _ when true => 0
};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, '''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  cases
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          name: _
        whenClause: WhenClause
          whenKeyword: when
          expression: BooleanLiteral
            literal: true
      arrow: =>
      expression: IntegerLiteral
        literal: 0
  rightBracket: }
''');
  }

  test_switchExpression_onePattern_noTrailingComma() {
    _parse('''
f(x) => switch(x) {
  _ => 0
};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, '''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  cases
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          name: _
      arrow: =>
      expression: IntegerLiteral
        literal: 0
  rightBracket: }
''');
  }

  test_switchExpression_onePattern_trailingComma() {
    _parse('''
f(x) => switch(x) {
  _ => 0,
};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, '''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  cases
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          name: _
      arrow: =>
      expression: IntegerLiteral
        literal: 0
  rightBracket: }
''');
  }

  test_switchExpression_twoPatterns() {
    _parse('''
f(x) => switch(x) {
  int _ => 0,
  _ => 1
};
''');
    var node = findNode.switchExpression('switch');
    assertParsedNodeText(node, '''
SwitchExpression
  switchKeyword: switch
  leftParenthesis: (
  expression: SimpleIdentifier
    token: x
  rightParenthesis: )
  leftBracket: {
  cases
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          type: NamedType
            name: SimpleIdentifier
              token: int
          name: _
      arrow: =>
      expression: IntegerLiteral
        literal: 0
    SwitchExpressionCase
      guardedPattern: GuardedPattern
        pattern: VariablePattern
          name: _
      arrow: =>
      expression: IntegerLiteral
        literal: 1
  rightBracket: }
''');
  }

  test_variable_bare_insideCast() {
    _parse('''
void f(x) {
  var (y as Object) = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: CastPattern
    pattern: VariablePattern
      name: y
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: Object
  rightParenthesis: )
''');
  }

  test_variable_bare_insideNullAssert() {
    _parse('''
void f(x) {
  var (y!) = x;
}
''');
    var node = findNode.patternVariableDeclaration('= x').pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: PostfixPattern
    operand: VariablePattern
      name: y
    operator: !
  rightParenthesis: )
''');
  }

  test_variable_final_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case final int y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: final
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: y
''');
  }

  test_variable_final_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case final int y as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_final_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case final int y) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: final
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: y
''');
  }

  test_variable_final_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case final int y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  operator: !
''');
  }

  test_variable_final_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case final int y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  operator: ?
''');
  }

  test_variable_final_untyped_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case final y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: final
  name: y
''');
  }

  test_variable_final_untyped_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case final y as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: final
    name: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_final_untyped_insideIfCase() {
    _parse('''
void f(x) {
  if (x case final y) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: final
      name: y
''');
  }

  test_variable_final_untyped_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case final y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    name: y
  operator: !
''');
  }

  test_variable_final_untyped_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case final y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    name: y
  operator: ?
''');
  }

  test_variable_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case int y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: y
''');
  }

  test_variable_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case int y as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case int y) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: y
''');
  }

  test_variable_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case int y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  operator: !
''');
  }

  test_variable_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case int y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: y
  operator: ?
''');
  }

  test_variable_typedNamedAs_absurd() {
    _parse('''
void f(x) {
  switch (x) {
    case when as as when when as as when == as as when:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: CastPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: when
      name: as
    asToken: as
    type: NamedType
      name: SimpleIdentifier
        token: when
  whenClause: WhenClause
    whenKeyword: when
    expression: BinaryExpression
      leftOperand: AsExpression
        expression: SimpleIdentifier
          token: as
        asOperator: as
        type: NamedType
          name: SimpleIdentifier
            token: when
      operator: ==
      rightOperand: AsExpression
        expression: SimpleIdentifier
          token: as
        asOperator: as
        type: NamedType
          name: SimpleIdentifier
            token: when
''');
  }

  test_variable_typedNamedAs_beforeWhen() {
    _parse('''
void f(x) {
  switch (x) {
    case int as when true:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  whenClause: WhenClause
    whenKeyword: when
    expression: BooleanLiteral
      literal: true
''');
  }

  test_variable_typedNamedAs_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case int as:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: as
''');
  }

  test_variable_typedNamedAs_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case int as as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_typedNamedAs_insideIfCase() {
    _parse('''
void f(x) {
  if (x case int as) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: as
''');
  }

  test_variable_typedNamedAs_insideList() {
    _parse('''
void f(x) {
  switch (x) {
    case [int as]:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ListPattern
  leftBracket: [
  elements
    VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: as
  rightBracket: ]
''');
  }

  test_variable_typedNamedAs_insideLogicalAnd_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int as && 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  operator: &&
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_variable_typedNamedAs_insideLogicalAnd_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 && int as:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: &&
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
''');
  }

  test_variable_typedNamedAs_insideLogicalOr_lhs() {
    _parse('''
void f(x) {
  switch (x) {
    case int as || 2:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  operator: ||
  rightOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 2
''');
  }

  test_variable_typedNamedAs_insideLogicalOr_rhs() {
    _parse('''
void f(x) {
  switch (x) {
    case 1 || int as:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
BinaryPattern
  leftOperand: ConstantPattern
    expression: IntegerLiteral
      literal: 1
  operator: ||
  rightOperand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
''');
  }

  test_variable_typedNamedAs_insideMap() {
    _parse('''
void f(x) {
  switch (x) {
    case {'a': int as}:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
MapPattern
  leftBracket: {
  elements
    MapPatternEntry
      key: SimpleStringLiteral
        literal: 'a'
      separator: :
      value: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
  rightBracket: }
''');
  }

  test_variable_typedNamedAs_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case int as!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  operator: !
''');
  }

  test_variable_typedNamedAs_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case int as?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  operator: ?
''');
  }

  test_variable_typedNamedAs_insideObject_explicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(f: int as):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: f
        colon: :
      pattern: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
  rightParenthesis: )
''');
  }

  test_variable_typedNamedAs_insideObject_implicitlyNamed() {
    _parse('''
class C {
  int? f;
}
void f(x) {
  switch (x) {
    case C(: int as):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ObjectPattern
  type: NamedType
    name: SimpleIdentifier
      token: C
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
  rightParenthesis: )
''');
  }

  test_variable_typedNamedAs_insideParenthesized() {
    _parse('''
void f(x) {
  switch (x) {
    case (int as):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
ParenthesizedPattern
  leftParenthesis: (
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: as
  rightParenthesis: )
''');
  }

  test_variable_typedNamedAs_insideRecord_explicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (n: int as, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        name: n
        colon: :
      pattern: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_variable_typedNamedAs_insideRecord_implicitlyNamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (: int as, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      fieldName: RecordPatternFieldName
        colon: :
      pattern: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_variable_typedNamedAs_insideRecord_unnamed() {
    _parse('''
void f(x) {
  switch (x) {
    case (int as, 2):
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
RecordPattern
  leftParenthesis: (
  fields
    RecordPatternField
      pattern: VariablePattern
        type: NamedType
          name: SimpleIdentifier
            token: int
        name: as
    RecordPatternField
      pattern: ConstantPattern
        expression: IntegerLiteral
          literal: 2
  rightParenthesis: )
''');
  }

  test_variable_typedNamedUnderscore_insideCase() {
    // We need to make sure the `_` isn't misinterpreted as a wildcard pattern
    _parse('''
void f(x) {
  switch (x) {
    case _ y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  type: NamedType
    name: SimpleIdentifier
      token: _
  name: y
''');
  }

  test_variable_typedNamedWhen_absurd() {
    _parse('''
void f(x) {
  switch (x) {
    case int when when when > 0:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: when
  whenClause: WhenClause
    whenKeyword: when
    expression: BinaryExpression
      leftOperand: SimpleIdentifier
        token: when
      operator: >
      rightOperand: IntegerLiteral
        literal: 0
''');
  }

  test_variable_typedNamedWhen_beforeWhen() {
    _parse('''
void f(x) {
  switch (x) {
    case int when when true:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: when
  whenClause: WhenClause
    whenKeyword: when
    expression: BooleanLiteral
      literal: true
''');
  }

  test_variable_typedNamedWhen_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case int when:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: when
''');
  }

  test_variable_typedNamedWhen_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case int when as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: when
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_var_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case var y:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: var
  name: y
''');
  }

  test_variable_var_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case var y as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: var
    name: y
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_variable_var_insideIfCase() {
    _parse('''
void f(x) {
  if (x case var y) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: var
      name: y
''');
  }

  test_variable_var_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case var y!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: var
    name: y
  operator: !
''');
  }

  test_variable_var_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case var y?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: var
    name: y
  operator: ?
''');
  }

  test_wildcard_bare_beforeWhen() {
    _parse('''
void f(x) {
  switch (x) {
    case _ when true:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern;
    assertParsedNodeText(node, r'''
GuardedPattern
  pattern: VariablePattern
    name: _
  whenClause: WhenClause
    whenKeyword: when
    expression: BooleanLiteral
      literal: true
''');
  }

  test_wildcard_bare_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  name: _
''');
  }

  test_wildcard_bare_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case _ as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    name: _
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_wildcard_bare_insideIfCase() {
    _parse('''
void f(x) {
  if (x case _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      name: _
''');
  }

  test_wildcard_bare_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case _!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    name: _
  operator: !
''');
  }

  test_wildcard_bare_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case _?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    name: _
  operator: ?
''');
  }

  test_wildcard_final_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case final int _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: final
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: _
''');
  }

  test_wildcard_final_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case final int _ as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_wildcard_final_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case final int _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: final
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: _
''');
  }

  test_wildcard_final_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case final int _!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  operator: !
''');
  }

  test_wildcard_final_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case final int _?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  operator: ?
''');
  }

  test_wildcard_final_untyped_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case final _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: final
  name: _
''');
  }

  test_wildcard_final_untyped_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case final _ as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: final
    name: _
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_wildcard_final_untyped_insideIfCase() {
    _parse('''
void f(x) {
  if (x case final _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: final
      name: _
''');
  }

  test_wildcard_final_untyped_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case final _!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    name: _
  operator: !
''');
  }

  test_wildcard_final_untyped_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case final _?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: final
    name: _
  operator: ?
''');
  }

  test_wildcard_typed_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case int _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  type: NamedType
    name: SimpleIdentifier
      token: int
  name: _
''');
  }

  test_wildcard_typed_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case int _ as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_wildcard_typed_insideIfCase() {
    _parse('''
void f(x) {
  if (x case int _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      type: NamedType
        name: SimpleIdentifier
          token: int
      name: _
''');
  }

  test_wildcard_typed_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case int _!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  operator: !
''');
  }

  test_wildcard_typed_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case int _?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    type: NamedType
      name: SimpleIdentifier
        token: int
    name: _
  operator: ?
''');
  }

  test_wildcard_var_insideCase() {
    _parse('''
void f(x) {
  switch (x) {
    case var _:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
VariablePattern
  keyword: var
  name: _
''');
  }

  test_wildcard_var_insideCast() {
    _parse('''
void f(x) {
  switch (x) {
    case var _ as Object:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
CastPattern
  pattern: VariablePattern
    keyword: var
    name: _
  asToken: as
  type: NamedType
    name: SimpleIdentifier
      token: Object
''');
  }

  test_wildcard_var_insideIfCase() {
    _parse('''
void f(x) {
  if (x case var _) {}
}
''');
    var node = findNode.caseClause('case');
    assertParsedNodeText(node, r'''
CaseClause
  caseKeyword: case
  guardedPattern: GuardedPattern
    pattern: VariablePattern
      keyword: var
      name: _
''');
  }

  test_wildcard_var_insideNullAssert() {
    _parse('''
void f(x) {
  switch (x) {
    case var _!:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: var
    name: _
  operator: !
''');
  }

  test_wildcard_var_insideNullCheck() {
    _parse('''
void f(x) {
  switch (x) {
    case var _?:
      break;
  }
}
''');
    var node = findNode.singleGuardedPattern.pattern;
    assertParsedNodeText(node, r'''
PostfixPattern
  operand: VariablePattern
    keyword: var
    name: _
  operator: ?
''');
  }

  void _parse(String content, {List<ExpectedError>? errors}) {
    var parseResult = parseStringWithErrors(content);
    if (errors != null) {
      parseResult.assertErrors(errors);
    } else {
      parseResult.assertNoErrors();
    }
    findNode = parseResult.findNode;
  }
}