Erik Ernst
3263555dc5
This CL introduces support for anonymous block methods (that is,
`e.{ print(this); }` as opposed to `e.=> print(this);`). It introduces
the notion of a `ReturnContext` which is used to change the semantics
of a return statement when it returns from an anonymous method (where
it works like a `break` that terminates the execution of the block
which is the body of the enclosing anonymous method), but keeps the
semantics of return statements returning from a function (including
function literals) still have the same semantics as today.
Change-Id: I404459361fbb7c2e495e46d1bd29924063f3aac4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/503800
SLSA-Policy-Verified: SLSA Policy Verification Service <devtools-gerritcodereview-exitgate@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>
76 lines
2.6 KiB
Dart
76 lines
2.6 KiB
Dart
// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// SharedOptions=--enable-experiment=anonymous-methods
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// This test confirms that compile-time errors specific to the
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// 'anonymous-methods' feature are emitted as expected.
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void main() {
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// Zero parameters.
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1.() {};
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// ^^
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// [analyzer] SYNTACTIC_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_LIST
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// [cfe] An anonymous method with a parameter list must have exactly one required, positional parameter.
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// Multiple parameters.
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1.(a, b) {};
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// ^^^^^^
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// [analyzer] SYNTACTIC_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_LIST
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// [cfe] An anonymous method with a parameter list must have exactly one required, positional parameter.
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// An optional positional parameter.
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1.([a]) {};
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// ^^^^^
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// [analyzer] SYNTACTIC_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_LIST
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// [cfe] An anonymous method with a parameter list must have exactly one required, positional parameter.
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// An optional named parameter.
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1.({a}) {};
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// ^^^^^
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// [analyzer] SYNTACTIC_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_LIST
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// [cfe] An anonymous method with a parameter list must have exactly one required, positional parameter.
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// A required named parameter.
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1.({required a}) {};
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// ^^^^^^^^^^^^^^
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// [analyzer] SYNTACTIC_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_LIST
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// [cfe] An anonymous method with a parameter list must have exactly one required, positional parameter.
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// A parameter type mismatch.
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"".(int i) {};
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// ^^^
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// [analyzer] COMPILE_TIME_ERROR.ANONYMOUS_METHOD_WRONG_PARAMETER_TYPE
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// [cfe] The receiver type 'String' must be assignable to the formal parameter type 'int' in an anonymous method.
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// Using a void value as receiver.
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StringBuffer('').{ return print('0'); }.toString();
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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//^
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// [cfe] This expression has type 'void' and can't be used.
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StringBuffer('').{ return print('0'); }.{ print('1'); };
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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//^
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// [cfe] This expression has type 'void' and can't be used.
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// Break outside of loop/switch.
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1.{
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break;
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// ^^^^^
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// [analyzer] SYNTACTIC_ERROR.BREAK_OUTSIDE_OF_LOOP
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// [cfe] A break statement can't be used outside of a loop or switch statement.
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};
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// Continue outside of loop.
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1.{
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continue;
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// ^^^^^^^^
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// [analyzer] SYNTACTIC_ERROR.CONTINUE_OUTSIDE_OF_LOOP
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// [cfe] A continue statement can't be used outside of a loop or switch statement.
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};
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}
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