Konstantin Shcheglov
8de8a1c226
They are all errors now. Change-Id: If48d38e38e845fd5b5a950dd5514bf1cbbce03d8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155880 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
93 lines
3.7 KiB
Dart
93 lines
3.7 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Verify semantics of the ?. operator when it is used to invoke a method.
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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bad() {
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Expect.fail('Should not be executed');
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}
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class B {}
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class C extends B {
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f(callback()) => callback();
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int g(int callback()) => callback();
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static staticF(callback()) => callback();
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static int staticG(int callback()) => callback();
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}
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C nullC() => null;
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main() {
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// Make sure the "none" test fails if method invocation using "?." is not
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// implemented. This makes status files easier to maintain.
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nullC()?.f(null);
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// o?.m(...) is equivalent to ((x) => x == null ? null : x.m(...))(o).
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Expect.equals(null, nullC()?.f(bad()));
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Expect.equals(1, new C()?.f(() => 1));
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// C?.m(...) is equivalent to C.m(...).
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Expect.equals(1, C?.staticF(() => 1));
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Expect.equals(1, h.C?.staticF(() => 1));
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// The static type of o?.m(...) is the same as the static type of
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// o.m(...).
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{ int i = nullC()?.g(bad()); Expect.equals(null, i); }
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{ int i = new C()?.g(() => 1); Expect.equals(1, i); }
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{ String s = nullC()?.g(bad()); Expect.equals(null, s); }
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// ^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
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// [cfe] A value of type 'int' can't be assigned to a variable of type 'String'.
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{ String s = new C()?.g(() => null); Expect.equals(null, s); }
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// ^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
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// ^
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// [cfe] A value of type 'int' can't be assigned to a variable of type 'String'.
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{ int i = C?.staticG(() => 1); Expect.equals(1, i); }
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{ int i = h.C?.staticG(() => 1); Expect.equals(1, i); }
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{ String s = C?.staticG(() => null); Expect.equals(null, s); }
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// ^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
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// ^
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// [cfe] A value of type 'int' can't be assigned to a variable of type 'String'.
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{ String s = h.C?.staticG(() => null); Expect.equals(null, s); }
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// ^^^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
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// ^
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// [cfe] A value of type 'int' can't be assigned to a variable of type 'String'.
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// Let T be the static type of o and let y be a fresh variable of type T.
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// Exactly the same static warnings that would be caused by y.m(...) are also
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// generated in the case of o?.m(...).
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{ B b = new C(); Expect.equals(1, b?.f(() => 1)); }
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// ^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_METHOD
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// [cfe] The method 'f' isn't defined for the class 'B'.
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{ int i = 1; Expect.equals(null, nullC()?.f(i)); }
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// ^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'int' can't be assigned to the parameter type 'dynamic Function()'.
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// '?.' can't be used to access toplevel functions in libraries imported via
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// prefix.
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h?.topLevelFunction();
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//^
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// [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT
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// [cfe] A prefix can't be used with null-aware operators.
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// Nor can it be used to access the toString method on the class Type.
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Expect.throwsNoSuchMethodError(() => C?.toString());
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// ^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_METHOD
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// [cfe] Method not found: 'C.toString'.
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Expect.throwsNoSuchMethodError(() => h.C?.toString());
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// ^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_METHOD
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// [cfe] Method not found: 'C.toString'.
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}
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