| // 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 A record is created using a record expression. The grammar is: |
| /// |
| /// literal ::= record |
| /// | // Existing literal productions... |
| /// record ::= 'const'? '(' recordField ( ',' recordField )* ','? ')' |
| /// recordField ::= (identifier ':' )? expression |
| /// |
| /// This is identical to the grammar for a function call argument list. There |
| /// are a couple of syntactic restrictions not captured by the grammar. It is a |
| /// compile-time error if a record has any of: |
| /// |
| /// The same field name more than once. |
| /// |
| /// Only one positional field and no trailing comma. |
| /// |
| /// No fields and a trailing comma. The expression (,) isn't allowed. |
| /// |
| /// A field named hashCode, runtimeType, noSuchMethod, or toString. |
| /// |
| /// A field name that starts with an underscore. |
| /// |
| /// A field name that collides with the synthesized getter name of a positional |
| /// field. For example: ('pos', $1: 'named') since the named field '$1' collides |
| /// with the getter for the first positional field. |
| /// |
| /// @description Checks that it is a compile-time error if a record has a field |
| /// name that starts with an underscore |
| /// @author sgrekhov22@gmail.com |
| |
| Record foo() => (42, _name: "Lily was here"); |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| void bar(Record r) {} |
| |
| main() { |
| var record1 = (42, _name: "Lily was here"); |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| var record2 = (x: 42, _y: 42); |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| bar((x: 42, _y: 42)); |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
