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>
83 lines
3.3 KiB
Dart
83 lines
3.3 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 does not appear on the LHS of an
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// assignment.
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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class B {}
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class C extends B {
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int v;
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C(this.v);
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static int staticInt;
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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 property access using "?." is not
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// implemented. This makes status files easier to maintain.
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nullC()?.v;
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// e1?.id is equivalent to ((x) => x == null ? null : x.id)(e1).
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Expect.equals(null, nullC()?.v);
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Expect.equals(1, new C(1)?.v);
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// C?.id is equivalent to C.id.
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{ C.staticInt = 1; Expect.equals(1, C?.staticInt); }
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{ h.C.staticInt = 1; Expect.equals(1, h.C?.staticInt); }
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// The static type of e1?.d is the static type of e1.id.
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{ int i = new C(1)?.v; Expect.equals(1, i); }
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{ String s = new C(null)?.v; 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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{ C.staticInt = 1; int i = C?.staticInt; Expect.equals(1, i); }
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{ h.C.staticInt = 1; int i = h.C?.staticInt; Expect.equals(1, i); }
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{ C.staticInt = null; String s = C?.staticInt; 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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{ h.C.staticInt = null; String s = h.C?.staticInt; 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 e1 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.id are also
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// generated in the case of e1?.id.
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Expect.equals(null, nullC()?.bad);
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// ^^^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER
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// [cfe] The getter 'bad' isn't defined for the class 'C'.
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{ B b = new C(1); Expect.equals(1, b?.v); }
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// ^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER
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// [cfe] The getter 'v' isn't defined for the class 'B'.
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// '?.' cannot be used to access toplevel properties in libraries imported via
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// prefix.
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var x = h?.topLevelVar;
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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 hashCode getter on the class Type.
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Expect.throwsNoSuchMethodError(() => C?.hashCode);
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// ^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER
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// [cfe] Getter not found: 'hashCode'.
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Expect.throwsNoSuchMethodError(() => h.C?.hashCode);
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// ^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER
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// [cfe] Getter not found: 'hashCode'.
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}
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