blob: 209d64c841cce4dd54ac730a294d0404f6e1ce7f [file] [log] [blame]
// 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 logical boolean expression b of the form e1 && e2 shows that a
/// variable v has type T if all of the following conditions hold:
/// • Either e1 shows that v has type T or e2 shows that v has type T.
/// • v is a local variable or formal parameter.
/// • The variable v is not mutated in e2 or within a closure.
/// Furthermore, if all of the following hold:
/// • e1 shows that v has type T.
/// • v is not mutated in either e1 , e2 or within a closure.
/// • If the variable v is accessed by a closure in e2 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 e2.
/// @description Checks that if v is local variable or formal parameter,
/// e1 shows that v has type T, v is not mutated in either e1, e2 or within a
/// closure, v is captured by a closure in e2, but v is potentially mutated
/// elsewhere in its scope, then the type of v is not known to be T in e2.
/// Local variable case.
/// @author ilya
import '../../../Utils/expect.dart';
class C {}
class D extends C {
f() {}
}
skyIsBlue(_) => true;
f(var y) {
var x = y;
var closure;
x is D && skyIsBlue(closure = () => x.f() /*throws*/);
x = new C();
closure();
}
main() {
Expect.throws(() => f(new D()));
}