blob: 91abae7ec126a17fe8c26903685edec065d1af91 [file] [log] [blame]
// TODO(multitest): This was automatically migrated from a multitest and may
// contain strange or dead code.
// Copyright (c) 2015, 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.
// Verify semantics of the ?. operator when it appears on the LHS of an
// assignment.
import "package:expect/expect.dart";
import "conditional_access_helper.dart" as h;
bad() {
Expect.fail('Should not be executed');
}
class B {}
class C extends B {
int v;
C(this.v);
static late int staticInt;
}
class D {
E v;
D(this.v);
static late E staticE;
}
class E {
G operator +(int i) => new I();
}
class F {}
class G extends E implements F {}
class H {}
class I extends G implements H {}
C? nullC() => null;
main() {
// Make sure the "none" test fails if assignment to "?." is not implemented.
// This makes status files easier to maintain.
nullC()?.v = 1;
// e1?.v = e2 is equivalent to ((x) => x == null ? null : x.v = e2)(e1).
// C?.v = e2 is equivalent to C.v = e2.
// The static type of e1?.v = e2 is the static type of e2.
// Exactly the same errors that would be caused by e1.v = e2 are
// also generated in the case of e1?.v = e2.
// e1?.v op= e2 is equivalent to ((x) => x?.v = x.v op e2)(e1).
// C?.v op= e2 is equivalent to C.v op= e2.
{ C.staticInt = 1; Expect.equals(3, C?.staticInt += 2); Expect.equals(3, C?.staticInt); }
// The static type of e1?.v op= e2 is the static type of e1.v op e2.
// Let T be the static type of e1 and let y be a fresh variable of type T.
// Exactly the same errors that would be caused by y.v op e2 are
// also generated in the case of e1?.v op= e2.
// '?.' cannot be used to assign to toplevel properties in libraries imported
// via prefix.
}