| // 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 @metadata (a, b) function() {} |
| /// This could be a metadata annotation @metadata(a, b) associated with a |
| /// function declaration with no return type. Or it could be a metadata |
| /// annotation @metadata associated with a function whose return type is the |
| /// record type (a, b). |
| /// |
| /// In practice, idiomatically written code is clear thanks to whitespace: |
| /// |
| /// @metadata(a, b) function() {} |
| /// |
| /// @metadata (a, b) function() {} |
| /// |
| /// The former applies (a, b) to the metadata annotation and the latter is a |
| /// return type. We disambiguate in the same way, by making whitespace after a |
| /// metadata annotation name significant. Change the grammar to: |
| /// |
| /// metadatum ::= identifier // Existing rule. |
| /// | qualifiedName // Existing rule. |
| /// | constructorDesignation NO_SPACE arguments // Changed. |
| /// The NO_SPACE lexical rule matches when there are no whitespace characters or |
| /// comments (according to the existing WHITESPACE and COMMENT lexical rules) |
| /// between the constructorDesignation and arguments. In other words, for an |
| /// argument list to be part of the metadata annotation, the ( must occur |
| /// immediately after the last character in the constructorDesignation. The last |
| /// character in constructorDesignation may be an identifier or the > in a type |
| /// argument list. |
| /// |
| /// @description Checks that it is a compile-time error if there is a record |
| /// variable declaration with no space between @metadata and (a, b) r = ... |
| /// declaration. Test generic metadata |
| /// @author sgrekhov22@gmail.com |
| |
| class Meta<T> { |
| const Meta(Type t1, Type t2); |
| } |
| |
| class M<T> { |
| const M(); |
| } |
| |
| main() { |
| /**/@Meta<int>(int, String) r1 = (1, "2"); |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| /**/@M<String>() r2 = (); |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |