pkg/_fe_analyzer_shared/messages.yaml

# Copyright (c) 2017, 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.

# This file contains error messages that are shared between the analyzer and the
# front end.

# See pkg/front_end/messages.yaml for documentation about this file.

# Currently, the code generation logic uses the presence of an `index` entry to
# determine whether a given error message should be generated into both the
# analyzer and the front end, so all error messages in this file should have a
# non-null `index`.
# TODO(paulberry): remove the need for the `index` field.

ExperimentNotEnabled:
  parameters:
    String string: undocumented
    String string2: undocumented
  index: 48
  problemMessage: "This requires the '#string' language feature to be enabled."
  correctionMessage: "Try updating your pubspec.yaml to set the minimum SDK constraint to #string2 or higher, and running 'pub get'."
  analyzerCode: ParserErrorCode.EXPERIMENT_NOT_ENABLED

ExperimentNotEnabledOffByDefault:
  parameters:
    String string: undocumented
  index: 133
  problemMessage: "This requires the experimental '#string' language feature to be enabled."
  correctionMessage: "Try passing the '--enable-experiment=#string' command line option."
  analyzerCode: ParserErrorCode.EXPERIMENT_NOT_ENABLED_OFF_BY_DEFAULT
  script: |
    // @dart=3.5
    void foo() {
      int i = 42_42_42_42;
    }

RecordLiteralOnePositionalFieldNoTrailingComma:
  parameters: none
  problemMessage: "A record literal with exactly one positional field requires a trailing comma."
  correctionMessage: "Try adding a trailing comma."
  analyzerCode: ParserErrorCode.RECORD_LITERAL_ONE_POSITIONAL_NO_TRAILING_COMMA
  index: 127
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a record literal with a single
    positional field doesn't have a trailing comma after the field.

    In some locations a record literal with a single positional field could
    also be a parenthesized expression. A trailing comma is required to
    disambiguate these two valid interpretations.

    #### Example

    The following code produces this diagnostic because the record literal has
    one positional field but doesn't have a trailing comma:

    ```dart
    var r = const (1[!)!];
    ```

    #### Common fixes

    Add a trailing comma:

    ```dart
    var r = const (1,);
    ```
  script: |
    main() {
      var record = const (1);
    }

RecordLiteralZeroFieldsWithTrailingComma:
  parameters: none
  problemMessage: "A record literal without fields can't have a trailing comma."
  correctionMessage: "Try removing the trailing comma."
  analyzerCode: ParserErrorCode.EMPTY_RECORD_LITERAL_WITH_COMMA
  index: 128
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a record literal that has no
    fields has a trailing comma. Empty record literals can't contain a comma.

    #### Example

    The following code produces this diagnostic because the empty record
    literal has a trailing comma:

    ```dart
    var r = ([!,!]);
    ```

    #### Common fixes

    If the record is intended to be empty, then remove the comma:

    ```dart
    var r = ();
    ```

    If the record is intended to have one or more fields, then add the
    expressions used to compute the values of those fields:

    ```dart
    var r = (3, 4);
    ```
  script: |
    main() {
      var record = (,);
    }

EmptyRecordTypeNamedFieldsList:
  parameters: none
  problemMessage: "The list of named fields in a record type can't be empty."
  correctionMessage: "Try adding a named field to the list."
  analyzerCode: ParserErrorCode.EMPTY_RECORD_TYPE_NAMED_FIELDS_LIST
  index: 129
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a record type has an empty list
    of named fields.

    #### Example

    The following code produces this diagnostic because the record type has an
    empty list of named fields:

    ```dart
    void f((int, int, {[!}!]) r) {}
    ```

    #### Common fixes

    If the record is intended to have named fields, then add the types and
    names of the fields:

    ```dart
    void f((int, int, {int z}) r) {}
    ```

    If the record isn't intended to have named fields, then remove the curly
    braces:

    ```dart
    void f((int, int) r) {}
    ```
  script: |
    main() {
      (int, int, {/*missing*/}) record = (1, 2,);
    }

RecordTypeZeroFieldsButTrailingComma:
  parameters: none
  problemMessage: "A record type without fields can't have a trailing comma."
  correctionMessage: "Try removing the trailing comma."
  analyzerCode: ParserErrorCode.EMPTY_RECORD_TYPE_WITH_COMMA
  index: 130
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a record type that has no
    fields has a trailing comma. Empty record types can't contain a comma.

    #### Example

    The following code produces this diagnostic because the empty record type
    has a trailing comma:

    ```dart
    void f(([!,!]) r) {}
    ```

    #### Common fixes

    If the record type is intended to be empty, then remove the comma:

    ```dart
    void f(() r) {}
    ```

    If the record type is intended to have one or more fields, then add the
    types of those fields:

    ```dart
    void f((int, int) r) {}
    ```
  script: |
    main() {
      (,) record = ();
    }

RecordTypeOnePositionalFieldNoTrailingComma:
  parameters: none
  problemMessage: "A record type with exactly one positional field requires a trailing comma."
  correctionMessage: "Try adding a trailing comma."
  analyzerCode: ParserErrorCode.RECORD_TYPE_ONE_POSITIONAL_NO_TRAILING_COMMA
  index: 131
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a record type annotation with a
    single positional field doesn't have a trailing comma after the field.

    In some locations a record type with a single positional field could also
    be a parenthesized expression. A trailing comma is required to
    disambiguate these two valid interpretations.

    #### Example

    The following code produces this diagnostic because the record type has
    one positional field, but doesn't have a trailing comma:

    ```dart
    void f((int[!)!] r) {}
    ```

    #### Common fixes

    Add a trailing comma:

    ```dart
    void f((int,) r) {}
    ```
  script: |
    main() {
      (int /* missing trailing comma */) record = const (1, );
    }

ExpectedElseOrComma:
  parameters: none
  index: 46
  problemMessage: "Expected 'else' or comma."
  analyzerCode: ParserErrorCode.EXPECTED_ELSE_OR_COMMA
  script: |
    void foo(int i) {
      var x = [
        if (i > 2) 2
        2
      ];
    }

ExpectedStatement:
  parameters: none
  index: 29
  problemMessage: "Expected a statement."
  analyzerCode: ParserErrorCode.MISSING_STATEMENT
  statement: "void;"

ExpectedInstead:
  parameters:
    String string: undocumented
  index: 41
  problemMessage: "Expected '#string' instead of this."
  # This is an alternative to ExpectedButGot when the last consumed token
  # should be replaced with a different token.
  #
  # For example, this is ok...
  #
  #    mixin Foo extends Bar {
  #              ^^^^^^^
  #              Expected 'on' before this
  #
  # but this is easier for the user...
  #
  #    mixin Foo extends Bar {
  #              ^^^^^^^
  #              Expected 'on' instead of this
  #
  analyzerCode: ParserErrorCode.EXPECTED_INSTEAD
  script:
    - "class B {} mixin A extends B { }"

MultipleLibraryDirectives:
  parameters: none
  index: 27
  problemMessage: "Only one library directive may be declared in a file."
  correctionMessage: "Try removing all but one of the library directives."
  analyzerCode: ParserErrorCode.MULTIPLE_LIBRARY_DIRECTIVES
  script:
    library foo;
    library bar;

MultipleExtends:
  parameters: none
  index: 28
  problemMessage: "Each class definition can have at most one extends clause."
  correctionMessage: "Try choosing one superclass and define your class to implement (or mix in) the others."
  analyzerCode: ParserErrorCode.MULTIPLE_EXTENDS_CLAUSES
  script:
    - "class B{} class C{} class A extends B extends C {}"
    - "class B{} class C{} class A extends B, C {}"

MultipleWith:
  parameters: none
  index: 24
  problemMessage: "Each class definition can have at most one with clause."
  correctionMessage: "Try combining all of the with clauses into a single clause."
  analyzerCode: ParserErrorCode.MULTIPLE_WITH_CLAUSES
  script: "class A extends B with C, D with E {}"
  exampleAllowOtherCodes: true

WithBeforeExtends:
  parameters: none
  index: 11
  problemMessage: "The extends clause must be before the with clause."
  correctionMessage: "Try moving the extends clause before the with clause."
  analyzerCode: ParserErrorCode.WITH_BEFORE_EXTENDS
  script: "mixin B {} class C {} class A with B extends C {}"

ImplementsBeforeExtends:
  parameters: none
  index: 44
  problemMessage: "The extends clause must be before the implements clause."
  correctionMessage: "Try moving the extends clause before the implements clause."
  analyzerCode: ParserErrorCode.IMPLEMENTS_BEFORE_EXTENDS
  script: "class A implements B extends C {}"
  exampleAllowOtherCodes: true

ImplementsBeforeOn:
  parameters: none
  index: 43
  problemMessage: "The on clause must be before the implements clause."
  correctionMessage: "Try moving the on clause before the implements clause."
  analyzerCode: ParserErrorCode.IMPLEMENTS_BEFORE_ON
  script: "mixin A implements B on C {}"
  exampleAllowOtherCodes: true

ImplementsBeforeWith:
  parameters: none
  index: 42
  problemMessage: "The with clause must be before the implements clause."
  correctionMessage: "Try moving the with clause before the implements clause."
  analyzerCode: ParserErrorCode.IMPLEMENTS_BEFORE_WITH
  script: "class A extends B implements C with D {}"
  exampleAllowOtherCodes: true

MultipleClauses:
  parameters:
    String string: undocumented
    String string2: undocumented
  problemMessage: "Each '#string' definition can have at most one '#string2' clause."
  correctionMessage: "Try combining all of the '#string2' clauses into a single clause."
  analyzerCode: ParserErrorCode.MULTIPLE_CLAUSES
  index: 121
  script:
    - "mixin B {} enum A implements B implements C, D { v; }"
    - "mixin B {} enum A with B with C, D { v; }"

OutOfOrderClauses:
  parameters:
    String string: undocumented
    String string2: undocumented
  problemMessage: "The '#string' clause must come before the '#string2' clause."
  correctionMessage: "Try moving the '#string' clause before the '#string2' clause."
  analyzerCode: ParserErrorCode.OUT_OF_ORDER_CLAUSES
  index: 122
  script: "class B {} class D {} enum A implements B with D { v; }"

MultipleOnClauses:
  parameters: none
  index: 26
  problemMessage: "Each mixin definition can have at most one on clause."
  correctionMessage: "Try combining all of the on clauses into a single clause."
  analyzerCode: ParserErrorCode.MULTIPLE_ON_CLAUSES
  script: "mixin A on B on C, D {}"
  exampleAllowOtherCodes: true

MixinWithClause:
  parameters: none
  index: 154
  problemMessage: "A mixin can't have a with clause."
  analyzerCode: ParserErrorCode.MIXIN_WITH_CLAUSE
  script: "mixin M {} mixin N with M {}"

ExpectedClassBody:
  parameters: none
  index: 8
  problemMessage: "A class declaration must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_CLASS_BODY
  sharedName: EXPECTED_BODY
  script: |
    class Class

ExpectedMixinBody:
  parameters: none
  index: 166
  problemMessage: "A mixin declaration must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_MIXIN_BODY
  sharedName: EXPECTED_BODY
  script: |
    mixin Mixin

ExpectedExtensionBody:
  parameters: none
  index: 173
  problemMessage: "An extension declaration must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_EXTENSION_BODY
  sharedName: EXPECTED_BODY
  script: |
    extension Extension on int

ExpectedExtensionTypeBody:
  parameters: none
  index: 167
  problemMessage: "An extension type declaration must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_EXTENSION_TYPE_BODY
  sharedName: EXPECTED_BODY
  script: |
    extension type ExtensionType(int i)

ExpectedTryStatementBody:
  parameters: none
  index: 168
  problemMessage: "A try statement must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_TRY_STATEMENT_BODY
  sharedName: EXPECTED_BODY
  script: |
    method() {
      try finally {}
    }

ExpectedCatchClauseBody:
  parameters: none
  index: 169
  problemMessage: "A catch clause must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_CATCH_CLAUSE_BODY
  sharedName: EXPECTED_BODY
  script: |
    method() {
      try {} catch (_);
    }

ExpectedFinallyClauseBody:
  parameters: none
  index: 170
  problemMessage: "A finally clause must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_FINALLY_CLAUSE_BODY
  sharedName: EXPECTED_BODY
  script: |
    method() {
      try {} finally;
    }

ExpectedSwitchExpressionBody:
  parameters: none
  index: 171
  problemMessage: "A switch expression must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_SWITCH_EXPRESSION_BODY
  sharedName: EXPECTED_BODY
  script: |
    method(Never n) => switch (n);

ExpectedSwitchStatementBody:
  parameters: none
  index: 172
  problemMessage: "A switch statement must have a body, even if it is empty."
  correctionMessage: "Try adding an empty body."
  analyzerCode: ParserErrorCode.EXPECTED_SWITCH_STATEMENT_BODY
  sharedName: EXPECTED_BODY
  script: |
    method(Never n) {
      switch (n);
    }

ExpectedIdentifierButGotKeyword:
  parameters:
    Token lexeme: undocumented
  problemMessage: "'#lexeme' can't be used as an identifier because it's a keyword."
  correctionMessage: "Try renaming this to be an identifier that isn't a keyword."
  index: 113
  analyzerCode: ParserErrorCode.EXPECTED_IDENTIFIER_BUT_GOT_KEYWORD
  script: "var default = 42;"

EqualityCannotBeEqualityOperand:
  parameters: none
  index: 1
  problemMessage: "A comparison expression can't be an operand of another comparison expression."
  correctionMessage: "Try putting parentheses around one of the comparisons."
  analyzerCode: ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND
  exampleAllowOtherCodes: true
  script:
    - "main() { var b = a < b < c; }"
    - "main() { var b = a == b != c; }"

VarAsTypeName:
  parameters: none
  index: 61
  problemMessage: "The keyword 'var' can't be used as a type name."
  analyzerCode: ParserErrorCode.VAR_AS_TYPE_NAME
  script:
    - "class A { Map<String, var> m; }"
  exampleAllowOtherCodes: true

MissingExpressionInThrow:
  parameters: none
  index: 32
  problemMessage: "Missing expression after 'throw'."
  correctionMessage: "Add an expression after 'throw' or use 'rethrow' to throw a caught exception"
  analyzerCode: ParserErrorCode.MISSING_EXPRESSION_IN_THROW
  statement:
    - "throw;"

MissingConstFinalVarOrType:
  parameters: none
  index: 33
  problemMessage: "Variables must be declared using the keywords 'const', 'final', 'var' or a type name."
  correctionMessage: "Try adding the name of the type of the variable or the keyword 'var'."
  analyzerCode: ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE
  script:
    - "class C { static f; }"

FunctionTypedParameterVar:
  parameters: none
  index: 119
  problemMessage: "Function-typed parameters can't specify 'const', 'final' or 'var' in place of a return type."
  correctionMessage: "Try replacing the keyword with a return type."
  analyzerCode: ParserErrorCode.FUNCTION_TYPED_PARAMETER_VAR
  script:
    - "void f(const x()) {}"
    - "void f(final x()) {}"
    - "void f(var x()) {}"
  exampleAllowOtherCodes: true

AbstractClassMember:
  parameters: none
  index: 51
  problemMessage: "Members of classes can't be declared to be 'abstract'."
  correctionMessage: "Try removing the 'abstract' keyword. You can add the 'abstract' keyword before the class declaration."
  analyzerCode: ParserErrorCode.ABSTRACT_CLASS_MEMBER
  script:
    - |
      abstract class C {abstract C.c();}
    - |
      abstract class C {abstract m();}
    - |
      abstract class C {abstract get m;}
    - |
      abstract class C {abstract set m(int x);}

AbstractExternalField:
  parameters: none
  index: 110
  problemMessage: "Fields can't be declared both 'abstract' and 'external'."
  analyzerCode: ParserErrorCode.ABSTRACT_EXTERNAL_FIELD
  correctionMessage: "Try removing the 'abstract' or 'external' keyword."
  script:
    - "abstract class C {abstract external var f;}"
    - "abstract class C {external abstract var f;}"

AbstractStaticField:
  parameters: none
  index: 107
  problemMessage: "Static fields can't be declared 'abstract'."
  analyzerCode: ParserErrorCode.ABSTRACT_STATIC_FIELD
  correctionMessage: "Try removing the 'abstract' or 'static' keyword."
  script:
    - "abstract class C {abstract static var f;}"

AbstractLateField:
  parameters: none
  index: 108
  problemMessage: "Abstract fields cannot be late."
  analyzerCode: ParserErrorCode.ABSTRACT_LATE_FIELD
  correctionMessage: "Try removing the 'abstract' or 'late' keyword."
  script:
    - "abstract class C {abstract late var f;}"

AbstractFinalBaseClass:
  parameters: none
  problemMessage: "An 'abstract' class can't be declared as both 'final' and 'base'."
  correctionMessage: "Try removing either the 'final' or 'base' keyword."
  analyzerCode: ParserErrorCode.ABSTRACT_FINAL_BASE_CLASS
  index: 176
  script:
    - "abstract final base class C {}"

AbstractFinalInterfaceClass:
  parameters: none
  problemMessage: "An 'abstract' class can't be declared as both 'final' and 'interface'."
  correctionMessage: "Try removing either the 'final' or 'interface' keyword."
  analyzerCode: ParserErrorCode.ABSTRACT_FINAL_INTERFACE_CLASS
  index: 50
  script:
    - "abstract final interface class C {}"

AbstractSealedClass:
  parameters: none
  problemMessage: "A 'sealed' class can't be marked 'abstract' because it's already implicitly abstract."
  correctionMessage: "Try removing the 'abstract' keyword."
  analyzerCode: ParserErrorCode.ABSTRACT_SEALED_CLASS
  index: 132
  hasPublishedDocs: true
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a class is declared using both
    the modifier `abstract` and the modifier `sealed`. Sealed classes are
    implicitly abstract, so explicitly using both modifiers is not allowed.

    #### Example

    The following code produces this diagnostic because the class `C` is
    declared using both `abstract` and `sealed`:

    ```dart
    abstract [!sealed!] class C {}
    ```

    #### Common fixes

    If the class should be abstract but not sealed, then remove the `sealed`
    modifier:

    ```dart
    abstract class C {}
    ```

    If the class should be both abstract and sealed, then remove the
    `abstract` modifier:

    ```dart
    sealed class C {}
    ```
  script:
    - "sealed abstract class C {}"
    - "abstract sealed class C {}"

ClassInClass:
  parameters: none
  index: 53
  problemMessage: "Classes can't be declared inside other classes."
  correctionMessage: "Try moving the class to the top-level."
  analyzerCode: ParserErrorCode.CLASS_IN_CLASS
  script:
    - "class C { class B {} }"

EnumInClass:
  parameters: none
  index: 74
  problemMessage: "Enums can't be declared inside classes."
  correctionMessage: "Try moving the enum to the top-level."
  analyzerCode: ParserErrorCode.ENUM_IN_CLASS
  script:
    - "class Foo { enum Bar { Bar1, Bar2, Bar3 } }"

TypedefInClass:
  parameters: none
  index: 7
  problemMessage: "Typedefs can't be declared inside classes."
  correctionMessage: "Try moving the typedef to the top-level."
  analyzerCode: ParserErrorCode.TYPEDEF_IN_CLASS
  script:
    - "abstract class C { typedef int F(int x); }"

CovariantMember:
  parameters: none
  index: 67
  problemMessage: "Getters, setters and methods can't be declared to be 'covariant'."
  correctionMessage: "Try removing the 'covariant' keyword."
  analyzerCode: ParserErrorCode.COVARIANT_MEMBER
  script:
    - "class A { covariant get x => 0; }"
    - "class A { covariant int m() => 0; }"

VarReturnType:
  parameters: none
  index: 12
  problemMessage: "The return type can't be 'var'."
  correctionMessage: "Try removing the keyword 'var', or replacing it with the name of the return type."
  analyzerCode: ParserErrorCode.VAR_RETURN_TYPE
  script:
    - "class C { var m() {} }"
    - "class C { var C() {} }"

ConstClass:
  parameters: none
  index: 60
  problemMessage: "Classes can't be declared to be 'const'."
  correctionMessage: "Try removing the 'const' keyword. If you're trying to indicate that instances of the class can be constants, place the 'const' keyword on  the class' constructor(s)."
  analyzerCode: ParserErrorCode.CONST_CLASS
  script: "const class C {}"

ConstAndFinal:
  parameters: none
  index: 58
  problemMessage: "Members can't be declared to be both 'const' and 'final'."
  correctionMessage: "Try removing either the 'const' or 'final' keyword."
  analyzerCode: ParserErrorCode.CONST_AND_FINAL
  declaration:
    - "class C { static const final int x = 5; }"
    - "class C { static final const int x = 5; }"
    - "const final int x = 5;"
    - "final const int x = 5;"

ConflictingModifiers:
  parameters:
    String string: undocumented
    String string2: undocumented
  index: 59
  problemMessage: "Members can't be declared to be both '#string' and '#string2'."
  correctionMessage: "Try removing one of the keywords."
  analyzerCode: ParserErrorCode.CONFLICTING_MODIFIERS
  script:
    - "class C { const var x; }"
    - "class C { var const x; }"
  exampleAllowOtherCodes: true

ConstFactory:
  parameters: none
  index: 62
  problemMessage: "Only redirecting factory constructors can be declared to be 'const'."
  correctionMessage: "Try removing the 'const' keyword, or replacing the body with '=' followed by a valid target."
  analyzerCode: ParserErrorCode.CONST_FACTORY
  script: |
    class C {
      const factory C() => const C.internal();
      const C.internal();
    }

ModifierOutOfOrder:
  parameters:
    String string: undocumented
    String string2: undocumented
  index: 56
  problemMessage: "The modifier '#string' should be before the modifier '#string2'."
  correctionMessage: "Try re-ordering the modifiers."
  analyzerCode: ParserErrorCode.MODIFIER_OUT_OF_ORDER
  script:
    - "class C { factory const C() = prefix.B.foo; }"
    - "class C { factory external C(); }"
    - "class C { const external C(); }"
    - "class C { static external f(); }"
    - "class C { final static int f = 5; }"
    - "class C { var static f; }"
    - "var external foo; main(){}"
  exampleAllowOtherCodes: true

TypeBeforeFactory:
  parameters: none
  index: 57
  problemMessage: "Factory constructors cannot have a return type."
  correctionMessage: "Try removing the type appearing before 'factory'."
  analyzerCode: ParserErrorCode.TYPE_BEFORE_FACTORY
  script: |
    class C {
      T factory C() { return new C.constructor(); }
      C.constructor();
    }

ConstMethod:
  parameters: none
  index: 63
  problemMessage: "Getters, setters and methods can't be declared to be 'const'."
  correctionMessage: "Try removing the 'const' keyword."
  analyzerCode: ParserErrorCode.CONST_METHOD
  script:
    - "class C { const m() {} }"

CovariantAndStatic:
  parameters: none
  index: 66
  problemMessage: "Members can't be declared to be both 'covariant' and 'static'."
  correctionMessage: "Try removing either the 'covariant' or 'static' keyword."
  analyzerCode: ParserErrorCode.COVARIANT_AND_STATIC
  script:
    - "class A {} class C { covariant static A? f; }"
    - "class A {} class C { static covariant A? f; }"

DuplicatedModifier:
  parameters:
    Token lexeme: undocumented
  index: 70
  problemMessage: "The modifier '#lexeme' was already specified."
  correctionMessage: "Try removing all but one occurrence of the modifier."
  analyzerCode: ParserErrorCode.DUPLICATED_MODIFIER
  comment: |-
    Parameters:
    0: the modifier that was duplicated
  exampleAllowOtherCodes: true
  script:
    - "class C { const const m; }"
    - "class C { external external f(); }"
    - "class C { final final m = 5; }"
    - "class C { static static var m; }"
    - "class C { var var m; }"

ExternalConstructorWithFieldInitializers:
  parameters: none
  index: 87
  problemMessage: "An external constructor can't initialize fields."
  correctionMessage: "Try removing the field initializers, or removing the keyword 'external'."
  analyzerCode: ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_FIELD_INITIALIZERS
  script: |
    class Foo {
      var x = -1;
      external Foo.x(this.x);
    }

ExternalFactoryWithBody:
  parameters: none
  index: 86
  problemMessage: "External factories can't have a body."
  correctionMessage: "Try removing the body of the factory, or removing the keyword 'external'."
  analyzerCode: ParserErrorCode.EXTERNAL_FACTORY_WITH_BODY
  script:
    - "class C { external factory C() {} }"
  exampleAllowOtherCodes: true

ExternalLateField:
  parameters: none
  index: 109
  problemMessage: "External fields cannot be late."
  analyzerCode: ParserErrorCode.EXTERNAL_LATE_FIELD
  correctionMessage: "Try removing the 'external' or 'late' keyword."
  script:
    - "external late var f;"
    - "abstract class C {external late var f;}"

ExtraneousModifier:
  parameters:
    Token lexeme: undocumented
  index: 77
  problemMessage: "Can't have modifier '#lexeme' here."
  correctionMessage: "Try removing '#lexeme'."
  analyzerCode: ParserErrorCode.EXTRANEOUS_MODIFIER
  script:
    - "var abstract foo; main(){}"
    - "var static foo; main(){}"
    - "abstract var foo; main(){}"
    - "static var foo; main(){}"
    - "abstract foo; main(){}"
    - "static foo; main(){}"
    - "abstract enum foo {bar}"
    - "abstract void foo() {}"
    - "static void foo() {}"
    - "abstract typedef foo();"
    - "static typedef foo();"
  exampleAllowOtherCodes: true

ExtraneousModifierInExtension:
  parameters:
    Token lexeme: undocumented
  index: 98
  problemMessage: "Can't have modifier '#lexeme' in an extension."
  correctionMessage: "Try removing '#lexeme'."
  analyzerCode: ParserErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION
  hasPublishedDocs: true
  comment: No parameters.
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a member declared inside an
    extension uses the keyword `covariant` in the declaration of a parameter.
    Extensions aren't classes and don't have subclasses, so the keyword serves
    no purpose.

    #### Example

    The following code produces this diagnostic because `i` is marked as being
    covariant:

    ```dart
    extension E on String {
      void a([!covariant!] int i) {}
    }
    ```

    #### Common fixes

    Remove the `covariant` keyword:

    ```dart
    extension E on String {
      void a(int i) {}
    }
    ```
  script:
    - "extension on String { foo(covariant String child) {} }"

ExtraneousModifierInExtensionType:
  parameters:
    Token lexeme: undocumented
  index: 174
  problemMessage: "Can't have modifier '#lexeme' in an extension type."
  correctionMessage: "Try removing '#lexeme'."
  analyzerCode: ParserErrorCode.EXTRANEOUS_MODIFIER_IN_EXTENSION_TYPE
  script:
    - "extension type ET(String i) { foo(covariant String child) {} }"

ExtraneousModifierInPrimaryConstructor:
  parameters:
    Token lexeme: undocumented
  index: 175
  problemMessage: "Can't have modifier '#lexeme' in a primary constructor."
  correctionMessage: "Try removing '#lexeme'."
  analyzerCode: ParserErrorCode.EXTRANEOUS_MODIFIER_IN_PRIMARY_CONSTRUCTOR
  script:
    - "extension type ET(covariant String i) { }"

FinalAndCovariant:
  parameters: none
  index: 80
  problemMessage: "Members can't be declared to be both 'final' and 'covariant'."
  correctionMessage: "Try removing either the 'final' or 'covariant' keyword."
  analyzerCode: ParserErrorCode.FINAL_AND_COVARIANT
  script:
    - "class C { covariant final f = 5; }"
    - "class C { final covariant f = 5; }"
  exampleAllowOtherCodes: true

FinalAndCovariantLateWithInitializer:
  parameters: none
  index: 101
  problemMessage: "Members marked 'late' with an initializer can't be declared to be both 'final' and 'covariant'."
  correctionMessage: "Try removing either the 'final' or 'covariant' keyword, or removing the initializer."
  analyzerCode: ParserErrorCode.FINAL_AND_COVARIANT_LATE_WITH_INITIALIZER
  # Weak and strong doesn't matter in this instance.
  script:
    - "class C { covariant late final f = 5; }"

FinalAndVar:
  parameters: none
  index: 81
  problemMessage: "Members can't be declared to be both 'final' and 'var'."
  correctionMessage: "Try removing the keyword 'var'."
  analyzerCode: ParserErrorCode.FINAL_AND_VAR
  script:
    - "class C { final var x = 5; }"
    - "class C { var final x = 5; }"

StaticConstructor:
  parameters: none
  index: 4
  problemMessage: "Constructors can't be static."
  correctionMessage: "Try removing the keyword 'static'."
  analyzerCode: ParserErrorCode.STATIC_CONSTRUCTOR
  script:
    - "class C { static C() {} }"
    - "class C { static C.m() {} }"

GetterConstructor:
  parameters: none
  index: 103
  problemMessage: "Constructors can't be a getter."
  correctionMessage: "Try removing 'get'."
  analyzerCode: ParserErrorCode.GETTER_CONSTRUCTOR
  script:
    - "class C { get C.m() {} }"

SetterConstructor:
  parameters: none
  index: 104
  problemMessage: "Constructors can't be a setter."
  correctionMessage: "Try removing 'set'."
  analyzerCode: ParserErrorCode.SETTER_CONSTRUCTOR
  script:
    - "class C { set C.m(x) {} }"

StaticOperator:
  parameters: none
  index: 17
  problemMessage: "Operators can't be static."
  correctionMessage: "Try removing the keyword 'static'."
  analyzerCode: ParserErrorCode.STATIC_OPERATOR
  script:
    - "class C { static operator +(int x) => x + 1; }"

BreakOutsideOfLoop:
  parameters: none
  index: 52
  problemMessage: "A break statement can't be used outside of a loop or switch statement."
  correctionMessage: "Try removing the break statement."
  analyzerCode: ParserErrorCode.BREAK_OUTSIDE_OF_LOOP
  script:
    - "main() { break; }"

ContinueOutsideOfLoop:
  parameters: none
  index: 2
  problemMessage: "A continue statement can't be used outside of a loop or switch statement."
  correctionMessage: "Try removing the continue statement."
  analyzerCode: ParserErrorCode.CONTINUE_OUTSIDE_OF_LOOP
  script:
    - "main() { continue; }"
  exampleAllowOtherCodes: true

ContinueWithoutLabelInCase:
  parameters: none
  index: 64
  problemMessage: "A continue statement in a switch statement must have a label as a target."
  correctionMessage: "Try adding a label associated with one of the case clauses to the continue statement."
  analyzerCode: ParserErrorCode.CONTINUE_WITHOUT_LABEL_IN_CASE
  script:
    - "main(List<String> x) { switch (x) {case 1: continue;} }"

DuplicateLabelInSwitchStatement:
  parameters:
    Name name: undocumented
  index: 72
  problemMessage: "The label '#name' was already used in this switch statement."
  correctionMessage: "Try choosing a different name for this label."
  analyzerCode: ParserErrorCode.DUPLICATE_LABEL_IN_SWITCH_STATEMENT
  comment: |-
    Parameters:
    0: the label that was duplicated
  statement:
    - "switch (0) {l1: case 0: break; l1: case 1: break;}"

InitializedVariableInForEach:
  parameters: none
  index: 82
  problemMessage: "The loop variable in a for-each loop can't be initialized."
  correctionMessage: "Try removing the initializer, or using a different kind of loop."
  analyzerCode: ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH
  statement:
    - "for (int a = 0 in <int>[10]) {}"

InvalidAwaitFor:
  parameters: none
  index: 9
  problemMessage: "The keyword 'await' isn't allowed for a normal 'for' statement."
  correctionMessage: "Try removing the keyword, or use a for-each statement."
  analyzerCode: ParserErrorCode.INVALID_AWAIT_IN_FOR
  script:
    - "f() async {await for (int i = 0; i < 5; i++) {}}"

VoidWithTypeArguments:
  parameters: none
  problemMessage: "Type 'void' can't have type arguments."
  correctionMessage: "Try removing the type arguments."
  index: 100
  analyzerCode: ParserErrorCode.VOID_WITH_TYPE_ARGUMENTS
  script:
    - "void<int> f() {}"

# TODO(danrubel): Review where this error is generated and consider generating
# FieldInitializedOutsideDeclaringClass instead of this in some situations.
InvalidInitializer:
  parameters: none
  index: 90
  problemMessage: "Not a valid initializer."
  correctionMessage: "To initialize a field, use the syntax 'name = value'."
  analyzerCode: ParserErrorCode.INVALID_INITIALIZER
  script: |
    class A {
      int a = 0;
    }

    class B extends A {
      B() : super.a = 42;
    }
  exampleAllowOtherCodes: true

FieldInitializedOutsideDeclaringClass:
  parameters: none
  index: 88
  problemMessage: "A field can only be initialized in its declaring class"
  correctionMessage: "Try passing a value into the superclass constructor, or moving the initialization into the constructor body."
  analyzerCode: ParserErrorCode.FIELD_INITIALIZED_OUTSIDE_DECLARING_CLASS
  script:
    - "class A { int a; } class C extends A { C() : super.a = 42; }"
  exampleAllowOtherCodes: true

StackOverflow:
  parameters: none
  index: 19
  problemMessage: "The file has too many nested expressions or statements."
  correctionMessage: "Try simplifying the code."
  analyzerCode: ParserErrorCode.STACK_OVERFLOW

InvalidHexEscape:
  parameters: none
  index: 40
  problemMessage: "An escape sequence starting with '\\x' must be followed by 2 hexadecimal digits."
  analyzerCode: ParserErrorCode.INVALID_HEX_ESCAPE
  expression:
    - "'\\x0'"
    - "'\\x0y'"

InvalidUnicodeEscapeUStarted:
  parameters: none
  index: 38
  problemMessage: "An escape sequence starting with '\\u' must be followed by 4 hexadecimal digits or from 1 to 6 digits between '{' and '}'."
  analyzerCode: ParserErrorCode.INVALID_UNICODE_ESCAPE_U_STARTED
  expression:
    - "'\\u'"

InvalidUnicodeEscapeUNoBracket:
  parameters: none
  index: 124
  problemMessage: "An escape sequence starting with '\\u' must be followed by 4 hexadecimal digits."
  analyzerCode: ParserErrorCode.INVALID_UNICODE_ESCAPE_U_NO_BRACKET
  expression:
    - "'\\u0F'"

InvalidUnicodeEscapeUBracket:
  parameters: none
  index: 125
  problemMessage: "An escape sequence starting with '\\u{' must be followed by 1 to 6 hexadecimal digits followed by a '}'."
  analyzerCode: ParserErrorCode.INVALID_UNICODE_ESCAPE_U_BRACKET
  expression:
    - "'\\u{'"
    - "'\\u{03'"
    - "'\\u{0Z}'"
    - "'\\u{0000003}'"

InvalidEscapeStarted:
  parameters: none
  index: 126
  problemMessage: "The string '\\' can't stand alone."
  correctionMessage: "Try adding another backslash (\\) to escape the '\\'."
  analyzerCode: ParserErrorCode.INVALID_UNICODE_ESCAPE_STARTED
  exampleAllowOtherCodes: true
  expression:
    - |
      print('Hello, World!\
      ');

UnexpectedTokens:
  parameters: none
  problemMessage: "Unexpected tokens."
  analyzerCode: ParserErrorCode.UNEXPECTED_TOKENS
  index: 123
  script: "enum E w Foo { v; }"

LiteralWithClassAndNew:
  parameters:
    String string: undocumented
    Token lexeme: undocumented
  problemMessage: "A #string literal can't be prefixed by 'new #lexeme'."
  correctionMessage: "Try removing 'new' and '#lexeme'"
  analyzerCode: ParserErrorCode.LITERAL_WITH_CLASS_AND_NEW
  index: 115
  script:
    - "var x = new Map{};"
    - "var x = new Set{};"
    - "var x = new List[];"
    - "var x = new Map{1: 2};"
    - "var x = new Set{1};"
    - "var x = new List[1];"

LiteralWithClass:
  parameters:
    String string: undocumented
    Token lexeme: undocumented
  problemMessage: "A #string literal can't be prefixed by '#lexeme'."
  correctionMessage: "Try removing '#lexeme'"
  analyzerCode: ParserErrorCode.LITERAL_WITH_CLASS
  index: 116
  script:
    - "var x = Map{};"
    - "var x = Set{};"
    - "var x = List<String>[];"
    - "var x = Map{1: 2};"
    - "var x = Set{1};"
    - "var x = List<int>[1];"
    - "var x = const Map{};"
    - "var x = const Set{};"
    - "var x = const List[];"
    - "var x = const Map{1: 2};"
    - "var x = const Set{1};"
    - "var x = const List[1];"

LiteralWithNew:
  parameters: none
  problemMessage: "A literal can't be prefixed by 'new'."
  correctionMessage: "Try removing 'new'"
  analyzerCode: ParserErrorCode.LITERAL_WITH_NEW
  index: 117
  script:
    - "var x = new <String, String>{};"
    - "var x = new <String>{};"
    - "var x = new {};"
    - "var x = new [];"
    - "var x = new <String, String>{'a': 'b'};"
    - "var x = new <String>{'a'};"
    - "var x = new {'a': 'b'};"
    - "var x = new {'a'};"
    - "var x = new ['a'];"

OnlyTry:
  parameters: none
  index: 20
  problemMessage: "A try block must be followed by an 'on', 'catch', or 'finally' clause."
  correctionMessage: "Try adding either a catch or finally clause, or remove the try statement."
  analyzerCode: ParserErrorCode.MISSING_CATCH_OR_FINALLY
  statement: "try {}"

TypeAfterVar:
  parameters: none
  index: 89
  problemMessage: "Variables can't be declared using both 'var' and a type name."
  correctionMessage: "Try removing 'var.'"
  analyzerCode: ParserErrorCode.VAR_AND_TYPE
  script:
    - "var String foo; main(){}"
  exampleAllowOtherCodes: true

CatchSyntax:
  parameters: none
  index: 84
  problemMessage: "'catch' must be followed by '(identifier)' or '(identifier, identifier)'."
  correctionMessage: "No types are needed, the first is given by 'on', the second is always 'StackTrace'."
  analyzerCode: ParserErrorCode.CATCH_SYNTAX
  statement:
    - "try {} catch {}"
    - "try {} catch () {}"
    - "try {} catch (e,) {}"

CatchSyntaxExtraParameters:
  parameters: none
  index: 83
  problemMessage: "'catch' must be followed by '(identifier)' or '(identifier, identifier)'."
  correctionMessage: "No types are needed, the first is given by 'on', the second is always 'StackTrace'."
  analyzerCode: ParserErrorCode.CATCH_SYNTAX_EXTRA_PARAMETERS
  statement:
    - "try {} catch (e, s, x) {}"

SuperNullAware:
  parameters: none
  index: 18
  problemMessage: "The operator '?.' cannot be used with 'super' because 'super' cannot be null."
  correctionMessage: "Try replacing '?.' with '.'"
  analyzerCode: ParserErrorCode.INVALID_OPERATOR_QUESTIONMARK_PERIOD_FOR_SUPER
  script: |
    class Super {
      Super.named();
    }
    class Class extends Super {
      Class() : super?.named();
    }
  exampleAllowOtherCodes: true

NullAwareCascadeOutOfOrder:
  parameters: none
  index: 96
  problemMessage: "The '?..' cascade operator must be first in the cascade sequence."
  correctionMessage: "Try moving the '?..' operator to be the first cascade operator in the sequence."
  analyzerCode: ParserErrorCode.NULL_AWARE_CASCADE_OUT_OF_ORDER
  script: |
    void foo(int? x) {
      x
        ..hashCode
        ?..isEven;
    }
  exampleAllowOtherCodes: true

MetadataTypeArguments:
  parameters: none
  index: 91
  problemMessage: "An annotation can't use type arguments."
  analyzerCode: ParserErrorCode.ANNOTATION_WITH_TYPE_ARGUMENTS
  script: |
    // @dart=2.12
    class C<T> {
      const C();
    }
    @C<int>() // Error
    void foo() {}

MetadataTypeArgumentsUninstantiated:
  parameters: none
  index: 114
  problemMessage: "An annotation with type arguments must be followed by an argument list."
  analyzerCode: ParserErrorCode.ANNOTATION_WITH_TYPE_ARGUMENTS_UNINSTANTIATED
  script:
    - "@deprecated<int> class C {}"

MetadataSpaceBeforeParenthesis:
  parameters: none
  index: 134
  problemMessage: "Annotations can't have spaces or comments before the parenthesis."
  correctionMessage: Remove any spaces or comments before the parenthesis.
  analyzerCode: ParserErrorCode.ANNOTATION_SPACE_BEFORE_PARENTHESIS
  script:
    - >-
      class Foo<T> {
        const Foo();
      }
      @Foo<int> () var bar;
    - >-
      class Foo {
        const Foo();
      }
      @Foo () class Bar {}

ConstructorWithReturnType:
  parameters: none
  index: 55
  problemMessage: "Constructors can't have a return type."
  correctionMessage: "Try removing the return type."
  analyzerCode: ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE
  script:
    - "class C { int C() {} }"
    - "class C { void C.m() {} }"

ConstructorWithTypeParameters:
  parameters: none
  index: 99
  problemMessage: "Constructors can't have type parameters."
  analyzerCode: ParserErrorCode.TYPE_PARAMETER_ON_CONSTRUCTOR
  correctionMessage: "Try removing the type parameters."
  script:
    - >-
      class C { C<T>() {} }
    - >-
      class C { C.foo<T>() {} }
    - >-
      class C {
        factory C<T>() => new C.internal();
        C.internal();
      }
    - >-
      class C {
        factory C.foo<T>() => new C.internal();
        C.internal();
      }

ConstructorWithTypeArguments:
  parameters: none
  problemMessage: "A constructor invocation can't have type arguments after the constructor name."
  correctionMessage: "Try removing the type arguments or placing them after the class name."
  analyzerCode: ParserErrorCode.CONSTRUCTOR_WITH_TYPE_ARGUMENTS
  index: 118
  script:
    - "class C<X> { C.foo(); } bar() { new C.foo<int>(); }"
    - "class C<X> { C.foo(); } bar() { C.foo<int>(); }"

ConstructorWithWrongName:
  parameters: none
  problemMessage: "The name of a constructor must match the name of the enclosing class."
  analyzerCode: ParserErrorCode.INVALID_CONSTRUCTOR_NAME
  index: 102
  script:
    - >-
      class A { B.foo() {} }
    - >-
      class A {
        factory B() => new A.internal();
        A.internal();
      }
    - >-
      class A {
        factory B.foo() => new A.internal();
        A.internal();
      }

FieldInitializerOutsideConstructor:
  parameters: none
  index: 79
  problemMessage: "Field formal parameters can only be used in a constructor."
  correctionMessage: "Try removing 'this.'."
  analyzerCode: ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR
  hasPublishedDocs: true
  script:
    - "class C { void m(this.x); }"
  exampleAllowOtherCodes: true

NativeClauseShouldBeAnnotation:
  parameters: none
  index: 23
  problemMessage: "Native clause in this form is deprecated."
  correctionMessage: "Try removing this native clause and adding @native() or @native('native-name') before the declaration."
  analyzerCode: ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION

MissingPrefixInDeferredImport:
  parameters: none
  index: 30
  problemMessage: "Deferred imports should have a prefix."
  correctionMessage: "Try adding a prefix to the import by adding an 'as' clause."
  analyzerCode: ParserErrorCode.MISSING_PREFIX_IN_DEFERRED_IMPORT
  script:
    main.dart: |
      import 'lib.dart' deferred;
    lib.dart: ""

DeferredAfterPrefix:
  parameters: none
  index: 68
  problemMessage: "The deferred keyword should come immediately before the prefix ('as' clause)."
  correctionMessage: "Try moving the deferred keyword before the prefix."
  analyzerCode: ParserErrorCode.DEFERRED_AFTER_PREFIX
  script:
    main.dart: |
      import "lib.dart" as foo deferred;
    lib.dart: ""

DuplicateDeferred:
  parameters: none
  index: 71
  problemMessage: "An import directive can only have one 'deferred' keyword."
  correctionMessage: "Try removing all but one 'deferred' keyword."
  analyzerCode: ParserErrorCode.DUPLICATE_DEFERRED
  script:
    main.dart: |
      import "lib.dart" deferred as foo deferred;
    lib.dart: ""

DuplicatePrefix:
  parameters: none
  index: 73
  problemMessage: "An import directive can only have one prefix ('as' clause)."
  correctionMessage: "Try removing all but one prefix."
  analyzerCode: ParserErrorCode.DUPLICATE_PREFIX
  script:
    main.dart: |
      import "lib.dart" as foo as bar;
    lib.dart: ""

PrefixAfterCombinator:
  parameters: none
  index: 6
  problemMessage: "The prefix ('as' clause) should come before any show/hide combinators."
  correctionMessage: "Try moving the prefix before the combinators."
  analyzerCode: ParserErrorCode.PREFIX_AFTER_COMBINATOR
  script:
    main.dart: |
      import "lib.dart" show Foo hide Foo as Foo;
    lib.dart: ""

MixinDeclaresConstructor:
  parameters: none
  index: 95
  problemMessage: "Mixins can't declare constructors."
  analyzerCode: ParserErrorCode.MIXIN_DECLARES_CONSTRUCTOR
  script: |
    mixin M {
      const M();
    }

ExtensionDeclaresAbstractMember:
  parameters: none
  index: 94
  problemMessage: "Extensions can't declare abstract members."
  correctionMessage: "Try providing an implementation for the member."
  script: |
    extension E on int {
      void method();
    }
  analyzerCode: ParserErrorCode.EXTENSION_DECLARES_ABSTRACT_MEMBER
  comment: No parameters.
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when an abstract declaration is
    declared in an extension. Extensions can declare only concrete members.

    #### Example

    The following code produces this diagnostic because the method `a` doesn't
    have a body:

    ```dart
    extension E on String {
      int [!a!]();
    }
    ```

    #### Common fixes

    Either provide an implementation for the member or remove it.
  hasPublishedDocs: true

ExtensionDeclaresConstructor:
  parameters: none
  index: 92
  problemMessage: "Extensions can't declare constructors."
  correctionMessage: "Try removing the constructor declaration."
  script: |
    extension E on int {
      E();
    }
  analyzerCode: ParserErrorCode.EXTENSION_DECLARES_CONSTRUCTOR
  comment: No parameters.
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a constructor declaration is
    found in an extension. It isn't valid to define a constructor because
    extensions aren't classes, and it isn't possible to create an instance of
    an extension.

    #### Example

    The following code produces this diagnostic because there is a constructor
    declaration in `E`:

    ```dart
    extension E on String {
      [!E!]() : super();
    }
    ```

    #### Common fixes

    Remove the constructor or replace it with a static method.
  hasPublishedDocs: true

ExtensionAugmentationHasOnClause:
  parameters: none
  index: 93
  problemMessage: "Extension augmentations can't have 'on' clauses."
  correctionMessage: "Try removing the 'on' clause."
  analyzerCode: ParserErrorCode.EXTENSION_AUGMENTATION_HAS_ON_CLAUSE
  script: |
    augment extension E on int {}
  comment: No parameters.

AnnotationOnTypeArgument:
  parameters: none
  problemMessage: "Type arguments can't have annotations because they aren't declarations."
  analyzerCode: ParserErrorCode.ANNOTATION_ON_TYPE_ARGUMENT
  index: 111
  script:
    - "class A<E> {} class C { m() => new A<@Object() C>(); }"

ExternalClass:
  parameters: none
  index: 3
  problemMessage: "Classes can't be declared to be 'external'."
  correctionMessage: "Try removing the keyword 'external'."
  analyzerCode: ParserErrorCode.EXTERNAL_CLASS
  script:
    - "external class C {}"

ExternalEnum:
  parameters: none
  index: 5
  problemMessage: "Enums can't be declared to be 'external'."
  correctionMessage: "Try removing the keyword 'external'."
  analyzerCode: ParserErrorCode.EXTERNAL_ENUM
  script:
    - "external enum E {ONE}"

ExternalMethodWithBody:
  parameters: none
  index: 49
  problemMessage: "An external or native method can't have a body."
  analyzerCode: ParserErrorCode.EXTERNAL_METHOD_WITH_BODY
  script:
    - "class C {external foo() {}}"
    - "class C {foo() native {}}"
    - "class C {foo() native 'bar' {}}"

ExternalConstructorWithInitializer:
  parameters: none
  index: 106
  problemMessage: "An external constructor can't have any initializers."
  analyzerCode: ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_INITIALIZER
  script:
    - "class C { int? x; external C() : x = 1; }"
    - "class C { int? x; external C.foo() : x = 1; }"

ExternalTypedef:
  parameters: none
  index: 76
  problemMessage: "Typedefs can't be declared to be 'external'."
  correctionMessage: "Try removing the keyword 'external'."
  analyzerCode: ParserErrorCode.EXTERNAL_TYPEDEF
  script:
    - "external typedef F();"

OperatorWithTypeParameters:
  parameters: none
  index: 120
  problemMessage: "Types parameters aren't allowed when defining an operator."
  correctionMessage: "Try removing the type parameters."
  analyzerCode: ParserErrorCode.TYPE_PARAMETER_ON_OPERATOR
  comment: |-
    7.1.1 Operators: Type parameters are not syntactically supported on an
    operator.
  script:
    - "class C { operator []<T>(T t) => null; }"

LibraryDirectiveNotFirst:
  parameters: none
  index: 37
  problemMessage: "The library directive must appear before all other directives."
  correctionMessage: "Try moving the library directive before any other directives."
  analyzerCode: ParserErrorCode.LIBRARY_DIRECTIVE_NOT_FIRST
  script:
    - "class Foo{} library l;"
    - "import 'x.dart'; library l;"
    - "part 'a.dart'; library l;"
  exampleAllowOtherCodes: true

ImportAfterPart:
  parameters: none
  index: 10
  problemMessage: "Import directives must precede part directives."
  correctionMessage: "Try moving the import directives before the part directives."
  analyzerCode: ParserErrorCode.IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE
  script:
    - "part 'foo.dart'; import 'bar.dart';"
  exampleAllowOtherCodes: true

ExportAfterPart:
  parameters: none
  index: 75
  problemMessage: "Export directives must precede part directives."
  correctionMessage: "Try moving the export directives before the part directives."
  analyzerCode: ParserErrorCode.EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE
  exampleAllowOtherCodes: true
  script:
    - "part 'foo.dart'; export 'bar.dart';"

DirectiveAfterDeclaration:
  parameters: none
  index: 69
  problemMessage: "Directives must appear before any declarations."
  correctionMessage: "Try moving the directive before any declarations."
  analyzerCode: ParserErrorCode.DIRECTIVE_AFTER_DECLARATION
  script:
    - main.dart: |
        class foo { }
        import 'bar.dart';
      bar.dart: ""
    - main.dart: |
        class foo { }
        export 'bar.dart';
      bar.dart: ""

PartOfTwice:
  parameters: none
  index: 25
  problemMessage: "Only one part-of directive may be declared in a file."
  correctionMessage: "Try removing all but one of the part-of directives."
  analyzerCode: ParserErrorCode.MULTIPLE_PART_OF_DIRECTIVES
  script:
    - main.dart: |
        part "part.dart";
        main() {}
      other.dart: ""
      part.dart: |
        part of "other.dart";
        part of "main.dart";
    - main.dart: |
        part of "lib.dart";
        part of "lib.dart";
        main() {}
      lib.dart: |
        part "main.dart";
    - main.dart: |
        part "part.dart";
      part.dart: |
        part of "main.dart";
        part of "main.dart";

FactoryTopLevelDeclaration:
  parameters: none
  index: 78
  problemMessage: "Top-level declarations can't be declared to be 'factory'."
  correctionMessage: "Try removing the keyword 'factory'."
  analyzerCode: ParserErrorCode.FACTORY_TOP_LEVEL_DECLARATION
  script:
    - "factory class C {}"

RedirectionInNonFactory:
  parameters: none
  index: 21
  problemMessage: "Only factory constructor can specify '=' redirection."
  correctionMessage: "Try making this a factory constructor, or remove the redirection."
  analyzerCode: ParserErrorCode.REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR
  script:
    - "class C { C() = D; }"
  exampleAllowOtherCodes: true

TopLevelOperator:
  parameters: none
  index: 14
  problemMessage: "Operators must be declared within a class."
  correctionMessage: "Try removing the operator, moving it to a class, or converting it to be a function."
  analyzerCode: ParserErrorCode.TOP_LEVEL_OPERATOR
  script:
    - "operator +(bool x, bool y) => x | y;"
    - "bool operator +(bool x, bool y) => x | y;"
    - "void operator +(bool x, bool y) => x | y;"

TypeArgumentsOnTypeVariable:
  parameters:
    Name name: undocumented
  index: 13
  problemMessage: "Can't use type arguments with type variable '#name'."
  correctionMessage: "Try removing the type arguments."
  analyzerCode: ParserErrorCode.TYPE_ARGUMENTS_ON_TYPE_VARIABLE
  script:
    - "void method<S>(S<int> a) {}"

# Use this message when a duplicated declaration is introduced.  For example:
#
#    class C {} // First declaration (related information points here).
#    class C {} // Duplicated declaration (error here).
#    main() {
#      new C(); // Use of duplicated declaration.
#    }
#
# We follow the convention from C that a definition is the unique element that
# provides the implementation of a name, and a declaration may not be unique
# (for example, forward declaration). Using this terminology, one could argue
# that a method that is abstract or external is a declaration, not a
# definition. Similarly, imported names are declarations, not
# definitions. Consequently, it is more convenient to use the word
# "declaration" instead of "definition" as the former implies less.
MemberWithSameNameAsClass:
  parameters: none
  problemMessage: "A class member can't have the same name as the enclosing class."
  correctionMessage: "Try renaming the member."
  analyzerCode: ParserErrorCode.MEMBER_WITH_CLASS_NAME
  index: 105
  script:
    - "class C { get C {} }"
    - "class C { get C => 42; }"
    - "class C { set C(x) {} }"
    - "class C { set C(x) => 42; }"
    - "class C { int? C; }"
    - "class C { int? A, B, C, D, E; }"

MissingOperatorKeyword:
  parameters: none
  index: 31
  problemMessage: "Operator declarations must be preceded by the keyword 'operator'."
  correctionMessage: "Try adding the keyword 'operator'."
  analyzerCode: ParserErrorCode.MISSING_KEYWORD_OPERATOR
  script:
    - "class C { +(x) {} }"

InvalidOperator:
  parameters:
    Token lexeme: undocumented
  index: 39
  problemMessage: "The string '#lexeme' isn't a user-definable operator."
  analyzerCode: ParserErrorCode.INVALID_OPERATOR
  comment: |-
    Parameters:
    0: the operator that is invalid
  script:
    - "class C { void operator %=(x) {} }"

InvalidSuperInInitializer:
  parameters: none
  index: 47
  problemMessage: "Can only use 'super' in an initializer for calling the superclass constructor (e.g. 'super()' or 'super.namedConstructor()')"
  analyzerCode: ParserErrorCode.INVALID_SUPER_IN_INITIALIZER

InvalidThisInInitializer:
  parameters: none
  index: 65
  problemMessage: "Can only use 'this' in an initializer for field initialization (e.g. 'this.x = something') and constructor redirection (e.g. 'this()' or 'this.namedConstructor())"
  analyzerCode: ParserErrorCode.INVALID_THIS_IN_INITIALIZER

SwitchHasCaseAfterDefault:
  parameters: none
  index: 16
  problemMessage: "The default case should be the last case in a switch statement."
  correctionMessage: "Try moving the default case after the other case clauses."
  analyzerCode: ParserErrorCode.SWITCH_HAS_CASE_AFTER_DEFAULT_CASE
  script:
    - "class C { foo(int a) {switch (a) {default: return 0; case 1: return 1;}} }"

SwitchHasMultipleDefaults:
  parameters: none
  index: 15
  problemMessage: "The 'default' case can only be declared once."
  correctionMessage: "Try removing all but one default case."
  analyzerCode: ParserErrorCode.SWITCH_HAS_MULTIPLE_DEFAULT_CASES
  script:
    - "class C { foo(int a) {switch (a) {default: return 0; default: return 1;}} }"

ExpectedAnInitializer:
  parameters: none
  index: 36
  problemMessage: "Expected an initializer."
  analyzerCode: ParserErrorCode.MISSING_INITIALIZER
  script:
    - "class C { C() : {} }"

MissingAssignmentInInitializer:
  parameters: none
  index: 34
  problemMessage: "Expected an assignment after the field name."
  correctionMessage: "To initialize a field, use the syntax 'name = value'."
  analyzerCode: ParserErrorCode.MISSING_ASSIGNMENT_IN_INITIALIZER
  script:
    - "class C { C() : x(3) {} }"
  exampleAllowOtherCodes: true

RedirectingConstructorWithBody:
  parameters: none
  index: 22
  problemMessage: "Redirecting constructors can't have a body."
  correctionMessage: "Try removing the body, or not making this a redirecting constructor."
  analyzerCode: ParserErrorCode.REDIRECTING_CONSTRUCTOR_WITH_BODY
  script:
    - "class C { C() : this.x() {} }"
  exampleAllowOtherCodes: true

IllegalAssignmentToNonAssignable:
  parameters: none
  index: 45
  problemMessage: "Illegal assignment to non-assignable expression."
  analyzerCode: ParserErrorCode.ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE
  script:
    - "main(){ f()++; }"

MissingAssignableSelector:
  parameters: none
  index: 35
  problemMessage: "Missing selector such as '.identifier' or '[0]'."
  correctionMessage: "Try adding a selector."
  analyzerCode: ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR
  script:
    - "main(){ ++f(); }"

ColonInPlaceOfIn:
  parameters: none
  index: 54
  problemMessage: "For-in loops use 'in' rather than a colon."
  correctionMessage: "Try replacing the colon with the keyword 'in'."
  analyzerCode: ParserErrorCode.COLON_IN_PLACE_OF_IN
  script: |
    void foo() {
      for(var x : []) {}
    }

BinaryOperatorWrittenOut:
  parameters:
    String string: undocumented
    String string2: undocumented
  index: 112
  problemMessage: "Binary operator '#string' is written as '#string2' instead of the written out word."
  correctionMessage: "Try replacing '#string' with '#string2'."
  analyzerCode: ParserErrorCode.BINARY_OPERATOR_WRITTEN_OUT
  script: |
    int foo(int x, int y) => x xor y;

ExternalFactoryRedirection:
  parameters: none
  index: 85
  problemMessage: "A redirecting factory can't be external."
  correctionMessage: "Try removing the 'external' modifier."
  analyzerCode: ParserErrorCode.EXTERNAL_FACTORY_REDIRECTION
  script: |
    class Foo {
      Foo._(int i);
      external factory Foo.x(int i) = Foo._;
    }

MultipleVarianceModifiers:
  parameters: none
  index: 97
  problemMessage: "Each type parameter can have at most one variance modifier."
  correctionMessage: "Use at most one of the 'in', 'out', or 'inout' modifiers."
  analyzerCode: ParserErrorCode.MULTIPLE_VARIANCE_MODIFIERS
  experiments: variance
  script: |
    class C<in out X> {}


BaseEnum:
  parameters: none
  index: 155
  problemMessage: "Enums can't be declared to be 'base'."
  correctionMessage: "Try removing the keyword 'base'."
  analyzerCode: ParserErrorCode.BASE_ENUM
  script:
    - "base enum E { v }"

FinalEnum:
  parameters: none
  index: 156
  problemMessage: "Enums can't be declared to be 'final'."
  correctionMessage: "Try removing the keyword 'final'."
  analyzerCode: ParserErrorCode.FINAL_ENUM
  script:
    - "final enum E { v }"

InterfaceEnum:
  parameters: none
  index: 157
  problemMessage: "Enums can't be declared to be 'interface'."
  correctionMessage: "Try removing the keyword 'interface'."
  analyzerCode: ParserErrorCode.INTERFACE_ENUM
  script:
    - "interface enum E { v }"

SealedEnum:
  parameters: none
  index: 158
  problemMessage: "Enums can't be declared to be 'sealed'."
  correctionMessage: "Try removing the keyword 'sealed'."
  analyzerCode: ParserErrorCode.SEALED_ENUM
  script:
    - "sealed enum E { v }"

FinalMixin:
  parameters: none
  index: 146
  problemMessage: "A mixin can't be declared 'final'."
  correctionMessage: "Try removing the 'final' keyword."
  analyzerCode: ParserErrorCode.FINAL_MIXIN
  script:
    - "final mixin M {}"

InterfaceMixin:
  parameters: none
  index: 147
  problemMessage: "A mixin can't be declared 'interface'."
  correctionMessage: "Try removing the 'interface' keyword."
  analyzerCode: ParserErrorCode.INTERFACE_MIXIN
  script:
    - "interface mixin M {}"

SealedMixin:
  parameters: none
  index: 148
  problemMessage: "A mixin can't be declared 'sealed'."
  correctionMessage: "Try removing the 'sealed' keyword."
  analyzerCode: ParserErrorCode.SEALED_MIXIN
  script:
    - "sealed mixin M {}"

FinalMixinClass:
  parameters: none
  index: 142
  problemMessage: "A mixin class can't be declared 'final'."
  correctionMessage: "Try removing the 'final' keyword."
  analyzerCode: ParserErrorCode.FINAL_MIXIN_CLASS
  script:
    - "final mixin class C {}"

InterfaceMixinClass:
  parameters: none
  index: 143
  problemMessage: "A mixin class can't be declared 'interface'."
  correctionMessage: "Try removing the 'interface' keyword."
  analyzerCode: ParserErrorCode.INTERFACE_MIXIN_CLASS
  script:
    - "interface mixin class C {}"

SealedMixinClass:
  parameters: none
  index: 144
  problemMessage: "A mixin class can't be declared 'sealed'."
  correctionMessage: "Try removing the 'sealed' keyword."
  analyzerCode: ParserErrorCode.SEALED_MIXIN_CLASS
  script:
    - "sealed mixin class C {}"

InvalidConstantPatternNegation:
  parameters: none
  problemMessage: "Only negation of a numeric literal is supported as a constant pattern."
  correctionMessage: "Try wrapping the expression in 'const ( ... )'."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_NEGATION
  index: 135
  script: |
    method(x) {
      const y = 5;
      if (x case -y) {}
    }

InvalidConstantPatternUnary:
  parameters:
    Name name: undocumented
  problemMessage: "The unary operator #name is not supported as a constant pattern."
  correctionMessage: "Try wrapping the expression in 'const ( ... )'."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_UNARY
  index: 136
  script: |
    method(x) {
      const y = false;
      if (x case !y) {}
    }

InvalidConstantPatternDuplicateConst:
  parameters: none
  problemMessage: "Duplicate 'const' keyword in constant expression."
  correctionMessage: "Try removing one of the 'const' keywords."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_DUPLICATE_CONST
  index: 137
  script: |
    method(x) {
      if (x case const const []) {}
    }

InvalidConstantPatternEmptyRecordLiteral:
  parameters: none
  problemMessage: "The empty record literal is not supported as a constant pattern."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_EMPTY_RECORD_LITERAL
  index: 138
  script: |
    method(x) {
      if (x case const ()) {}
    }

InvalidConstantPatternGeneric:
  parameters: none
  problemMessage: "This expression is not supported as a constant pattern."
  correctionMessage: "Try wrapping the expression in 'const ( ... )'."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_GENERIC
  index: 139
  script: |
    method(x) {
      if (x case List<int>) {}
    }

InvalidConstantPatternConstPrefix:
  parameters: none
  problemMessage: "The expression can't be prefixed by 'const' to form a constant pattern."
  correctionMessage: "Try wrapping the expression in 'const ( ... )' instead."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_CONST_PREFIX
  index: 140
  script: |
    method(x) {
      if (x case const 1) {}
    }

InvalidConstantPatternBinary:
  parameters:
    Name name: undocumented
  problemMessage: "The binary operator #name is not supported as a constant pattern."
  correctionMessage: "Try wrapping the expression in 'const ( ... )'."
  analyzerCode: ParserErrorCode.INVALID_CONSTANT_PATTERN_BINARY
  index: 141
  script: |
    method(x) {
      if (x case 1 + 2) {}
    }

PatternAssignmentDeclaresVariable:
  parameters:
    Name name: undocumented
  problemMessage: "Variable '#name' can't be declared in a pattern assignment."
  correctionMessage: "Try using a preexisting variable or changing the assignment to a pattern variable declaration."
  analyzerCode: ParserErrorCode.PATTERN_ASSIGNMENT_DECLARES_VARIABLE
  index: 145
  script: |
    method(x) {
      var y;
      [y, var z] = x;
    }

VariablePatternKeywordInDeclarationContext:
  parameters: none
  problemMessage: Variable patterns in declaration context can't specify 'var' or 'final' keyword.
  correctionMessage: Try removing the keyword.
  analyzerCode: ParserErrorCode.VARIABLE_PATTERN_KEYWORD_IN_DECLARATION_CONTEXT
  index: 149
  comment: No parameters.
  hasPublishedDocs: true
  script: |
    void f((int, int) r) {
      var (var x, y) = r;
      print(x + y);
    }
  documentation: |-
    #### Description

    The analyzer produces this diagnostic when a variable pattern is used
    within a declaration context.

    #### Example

    The following code produces this diagnostic because the variable patterns
    in the record pattern are in a declaration context:

    ```dart
    void f((int, int) r) {
      var ([!var!] x, y) = r;
      print(x + y);
    }
    ```

    #### Common fixes

    Remove the `var` or `final` keyword(s) within the variable pattern:

    ```dart
    void f((int, int) r) {
      var (x, y) = r;
      print(x + y);
    }
    ```

IllegalPatternVariableName:
  parameters:
    Token lexeme: undocumented
  problemMessage: The variable declared by a variable pattern can't be named '#lexeme'.
  correctionMessage: Choose a different name.
  analyzerCode: ParserErrorCode.ILLEGAL_PATTERN_VARIABLE_NAME
  index: 159
  comment: |-
    Parameters:
    0: the illegal name
  script: |
    void f(x) {
      switch (x) {
        case var when:
      }
    }

IllegalPatternAssignmentVariableName:
  parameters:
    Token lexeme: undocumented
  problemMessage: A variable assigned by a pattern assignment can't be named '#lexeme'.
  correctionMessage: Choose a different name.
  analyzerCode: ParserErrorCode.ILLEGAL_PATTERN_ASSIGNMENT_VARIABLE_NAME
  index: 160
  comment: |-
    Parameters:
    0: the illegal name
  script: |
    void f(x) {
      dynamic when;
      (when) = x;
    }

IllegalPatternIdentifierName:
  parameters:
    Token lexeme: undocumented
  problemMessage: A pattern can't refer to an identifier named '#lexeme'.
  correctionMessage: Match the identifier using '== #lexeme'.
  analyzerCode: ParserErrorCode.ILLEGAL_PATTERN_IDENTIFIER_NAME
  index: 161
  comment: |-
    Parameters:
    0: the illegal name
  script: |
    void f(x) {
      const when = 0;
      switch (x) {
        case when:
      }
    }

InvalidInsideUnaryPattern:
  parameters: none
  problemMessage: This pattern cannot appear inside a unary pattern (cast pattern, null check pattern, or null assert pattern) without parentheses.
  correctionMessage: Try combining into a single pattern if possible, or enclose the inner pattern in parentheses.
  analyzerCode: ParserErrorCode.INVALID_INSIDE_UNARY_PATTERN
  index: 150
  comment: No parameters.
  script: |
    void f(x) {
      if (x case _ as int as num) {}
    }

LatePatternVariableDeclaration:
  parameters: none
  problemMessage: A pattern variable declaration may not use the `late` keyword.
  correctionMessage: Try removing the keyword `late`.
  analyzerCode: ParserErrorCode.LATE_PATTERN_VARIABLE_DECLARATION
  index: 151
  comment: No parameters.
  script: |
    void f(x) {
      late var (y, z) = x;
    }

PatternVariableDeclarationOutsideFunctionOrMethod:
  parameters: none
  problemMessage: A pattern variable declaration may not appear outside a function or method.
  correctionMessage: Try declaring ordinary variables and assigning from within a function or method.
  analyzerCode: ParserErrorCode.PATTERN_VARIABLE_DECLARATION_OUTSIDE_FUNCTION_OR_METHOD
  index: 152
  comment: No parameters.
  script: |
    class C {
      var (a, b) = (0, 1);
    }

DefaultInSwitchExpression:
  parameters: none
  problemMessage: A switch expression may not use the `default` keyword.
  correctionMessage: Try replacing `default` with `_`.
  analyzerCode: ParserErrorCode.DEFAULT_IN_SWITCH_EXPRESSION
  index: 153
  comment: No parameters.
  script: |
    void f(x) => switch (x) {
      1 => 'one',
      default => 'other'
    };

MissingPrimaryConstructor:
  parameters: none
  problemMessage: "An extension type declaration must have a primary constructor declaration."
  correctionMessage: "Try adding a primary constructor to the extension type declaration."
  index: 162
  analyzerCode: ParserErrorCode.MISSING_PRIMARY_CONSTRUCTOR
  script: |
    extension type E {}

MissingPrimaryConstructorParameters:
  parameters: none
  problemMessage: "A primary constructor declaration must have formal parameters."
  correctionMessage: "Try adding formal parameters after the primary constructor name."
  index: 163
  analyzerCode: ParserErrorCode.MISSING_PRIMARY_CONSTRUCTOR_PARAMETERS
  script: |
    extension type E.name {}

ExtensionTypeExtends:
  parameters: none
  problemMessage: "An extension type declaration can't have an 'extends' clause."
  correctionMessage: "Try removing the 'extends' clause or replacing the 'extends' with 'implements'."
  index: 164
  analyzerCode: ParserErrorCode.EXTENSION_TYPE_EXTENDS
  script: |
    extension type F(int i) {}
    extension type E(int i) extends F {}

ExtensionTypeWith:
  parameters: none
  problemMessage: "An extension type declaration can't have a 'with' clause."
  correctionMessage: "Try removing the 'with' clause or replacing the 'with' with 'implements'."
  index: 165
  analyzerCode: ParserErrorCode.EXTENSION_TYPE_WITH
  script: |
    extension type F(int i) {}
    extension type E(int i) with F {}