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Test field promotion during top level inference.
Bug: https://github.com/dart-lang/language/issues/2020 Change-Id: I58d7f5691a4af614bcd481a109e340ca709fe4ec Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/270760 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
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// Copyright (c) 2022, 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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// Tests that field promotion works during top level type inference. In the
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// CFE, top level types are inferred earlier than method bodies, so this
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// verifies that the data structures necessary to support field promotion have
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// been initialized in time.
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// SharedOptions=--enable-experiment=inference-update-2
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class C {
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final int? _promotable;
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final int? _notPromotable; // due to D._notPromotable
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C(int i)
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: _promotable = i,
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_notPromotable = i;
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static final staticPromotable =
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((C c) => c._promotable != null ? c._promotable : 0)(new C(0));
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static final staticNotPromotable =
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((C c) => c._notPromotable != null ? c._notPromotable : 0)(new C(0));
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final instancePromotable =
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((C c) => c._promotable != null ? c._promotable : 0)(new C(0));
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final instanceNotPromotable =
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((C c) => c._notPromotable != null ? c._notPromotable : 0)(new C(0));
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late final instancePromotableViaThis = _promotable != null ? _promotable : 0;
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late final instanceNotPromotableViaThis =
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_notPromotable != null ? _notPromotable : 0;
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}
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class D {
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int? _notPromotable;
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}
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final topLevelPromotable =
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((C c) => c._promotable != null ? c._promotable : 0)(new C(0));
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final topLevelNotPromotable =
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((C c) => c._notPromotable != null ? c._notPromotable : 0)(new C(0));
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void acceptsInt(int x) {}
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void testTopLevelPromotable() {
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var x = topLevelPromotable;
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// `x` has type `int` so this is ok
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acceptsInt(x);
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}
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void testTopLevelNotPromotable() {
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var x = topLevelNotPromotable;
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// `x` has type `int?` so this is ok
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x = null;
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}
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void testStaticPromotable() {
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var x = C.staticPromotable;
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// `x` has type `int` so this is ok
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acceptsInt(x);
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}
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void testStaticNotPromotable() {
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var x = C.staticNotPromotable;
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// `x` has type `int?` so this is ok
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x = null;
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}
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void testInstancePromotable(C c) {
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var x = c.instancePromotable;
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// `x` has type `int` so this is ok
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acceptsInt(x);
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}
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void testInstanceNotPromotable(C c) {
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var x = c.instanceNotPromotable;
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// `x` has type `int?` so this is ok
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x = null;
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}
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void testInstancePromotableViaThis(C c) {
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var x = c.instancePromotableViaThis;
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// `x` has type `int` so this is ok
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acceptsInt(x);
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}
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void testInstanceNotPromotableViaThis(C c) {
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var x = c.instanceNotPromotableViaThis;
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// `x` has type `int?` so this is ok
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x = null;
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}
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main() {}
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