LanguageFeatures/Records/record_type_annotations_A02_t12.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.

/// @assertion The grammar is:
///
/// // Existing rules:
/// type                   ::= functionType '?'?      // Existing production.
///                          | recordType             // New production.
///                          | typeNotFunction        // Existing production.
///
/// typeNotFunction        ::= 'void'                 // Existing production.
///                          | recordType             // New production.
///                          | typeNotVoidNotFunction // Existing production.
///
/// // New rules:
/// recordType            ::= '(' recordTypeFields ',' recordTypeNamedFields ')'
///                          | '(' recordTypeFields ','? ')'
///                          | '(' recordTypeNamedFields ')'
///
/// recordTypeFields       ::= recordTypeField ( ',' recordTypeField )*
/// recordTypeField        ::= metadata type identifier?
///
/// recordTypeNamedFields  ::= '{' recordTypeNamedField
///                            ( ',' recordTypeNamedField )* ','? '}'
/// recordTypeNamedField   ::= type identifier
/// recordTypeNamedField   ::= metadata typedIdentifier
///
/// The grammar is exactly the same as parameterTypeList in function types but
/// without `()`, `required`, and optional positional parameters since those
/// don't apply to record types. A record type can't appear in an extends,
/// implements, with, or mixin on clause, which is enforced by being a
/// production in `type` and not `typeNotVoid`.
///
/// @description Checks that records itself may be nullable
/// @author sgrekhov22@gmail.com

typedef R1 = (int? i, String? s)?;
typedef R2 = (int? i,{String? s})?;
typedef R3 = ({int? i, String? s})?;

typedef (int? i, {String? s})? R4();
typedef void R5((int? i, {String? s})? r);

(int? i, {String? s})? foo() => null;

void bar((int? i, {String? s})? r) {}

main() {
  (int? i, String? s)? r1 = null;
  (int? i, {String? s})? r2 = null;
  ({int? i, String? s})? r3 = null;
}