Language/Expressions/Function_Expressions/syntax_t01.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 A function literal is an object that encapsulates an executable
/// unit of code.
/// functionExpression:
///   formalParameterList functionExpressionBody
/// ;
/// @description Checks that various function expressions that are valid
/// according to the specification don't produce compile-time errors.
/// @author kaigorodov
/// @note the test split into t01 and t05


abstract class I {}
class C implements I {}

typedef int tf(int x, double y);

main() {
  // as right side of an assignment
  var f = () {};
  var f2 = (int k) {};
  var g = () => 1;
  var g2 = (int k) => k;
  var interfaceFunc = (C x, y) => new C();
  var classFunc = ([p1, String? p2]) { var x = p2; };
  var funcFunc = (tf p1, tf p2, [tf? p3]) => null;
  var funcFunc1 = (tf p1, tf p2, {tf? p3}) => null;

  // as function expression statement
  () {};
  (int k) {};
  () => 1;
  (C x, y) => new C();
  ([p1, String? p2]) { { var x = 1; } };
  (tf p1, tf p2, [tf? p3]) => null;

  // as an invocation of function expression
  // see test A01/t05
}