Language/Statements/If/type_t08.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 An if statement of the form if (b) s1 else s2.
/// If:
/// • b shows that a variable v has type T .
/// • v is not potentially mutated in s1 or within a closure.
/// • If the variable v is accessed by a closure in s1 then the variable v is
///   not potentially mutated anywhere in the scope of v.
/// Then the type of v is known to be T in s1.
/// @description Checks that if b shows that v has type T, v is not potentially
/// mutated in s1, but potentially mutated within a closure, then the type of v
/// is not known to be T in s1.
/// @author ilya


var closure;

class C {}
class D extends C {
  f() => closure();
}

test(C x) {
  closure = () => x = new C();

  if (x is D) {
    x.f();
//    ^
// [analyzer] unspecified
// [cfe] unspecified
    x.f();
//    ^
// [analyzer] unspecified
// [cfe] unspecified
  }
}

main() {
  test(new D());
}