Language/Expressions/Unary_Expressions/syntax_t25.dart

// Copyright (c) 2011, 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 Unary expressions invoke unary operators on objects.
/// unaryExpression:
///   prefixOperator unaryExpression |
///   awaitExpression |
///   postfixExpression |
///   (minusOperator | tildeOperator) super |
///   incrementOperator assignableExpression
/// ;
/// prefixOperator:
///   minusOperator |
///   negationOperator |
///   tildeOperator
/// ;
/// minusOperator:
///   ‘-’ |
/// ;
/// negationOperator:
///   ‘!’ |
/// ;
/// tildeOperator:
///   ‘˜’
/// ;
/// A unary expression is either a postfix expression, an await expression or
/// an invocation of a prefix operator on an expression or an invocation of a
/// unary operator on either super or an expression e.
/// @description Checks that it's a compile-time error when a '!'
/// precedes a statement that isn't an expression (block statement).
/// @author msyabro


main() {
  !{int? x; x = 1;};
//        ^
// [analyzer] unspecified
// [cfe] unspecified
}