blob: e5e1ed72ee0ba77963123f91ac01a2a46e7afcf2 [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 is used to invoke a method.
import "package:expect/expect.dart";
import "conditional_access_helper.dart" as h;
bad() {'Should not be executed');
class B {}
class C extends B {
f(callback()?) => callback!();
int g(int callback()) => callback();
static staticF(callback()) => callback();
static int staticG(int callback()) => callback();
C? nullC() => null;
main() {
// Make sure the "none" test fails if method invocation using "?." is not
// implemented. This makes status files easier to maintain.
// o?.m(...) is equivalent to ((x) => x == null ? null : x.m(...))(o).
Expect.equals(null, nullC()?.f(bad()));
// C?.m(...) is equivalent to C.m(...).
// The static type of o?.m(...) is the same as the static type of
// o.m(...).
// Let T be the static type of o and let y be a fresh variable of type T.
// Exactly the same static warnings that would be caused by y.m(...) are also
// generated in the case of o?.m(...).
// '?.' can't be used to access toplevel functions in libraries imported via
// prefix.
// Nor can it be used to access the toString method on the class Type.