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Unified Diff: pkg/front_end/testcases/inference/future_then_upwards_deprecated_2.dart

Issue 2846103002: Generated front_end/testcases/inference test files from Analyzer tests. (Closed)
Patch Set: Created 3 years, 8 months ago
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Index: pkg/front_end/testcases/inference/future_then_upwards_deprecated_2.dart
diff --git a/pkg/front_end/testcases/inference/future_then_upwards_deprecated_2.dart b/pkg/front_end/testcases/inference/future_then_upwards_deprecated_2.dart
new file mode 100644
index 0000000000000000000000000000000000000000..40ea3b85dec41d31b304afea51fa5d2366c2f2fc
--- /dev/null
+++ b/pkg/front_end/testcases/inference/future_then_upwards_deprecated_2.dart
@@ -0,0 +1,28 @@
+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=inference*/
+library test;
+
+import 'dart:async';
+
+class MyFuture<T> implements Future<T> {
+ MyFuture() {}
+ MyFuture.value(T x) {}
+ dynamic noSuchMethod(invocation);
+ MyFuture<S> then<S>(dynamic f(T x), {Function onError}) => null;
+}
+
+void main() {
+ var /*@type=MyFuture<double>*/ f =
+ foo().then(/*@returnType=double*/ (/*@type=dynamic*/ _) => 2.3);
+ MyFuture<int> f2 = /*error:INVALID_ASSIGNMENT*/ /*@promotedType=none*/ f;
+
+ // The unnecessary cast is to illustrate that we inferred <double> for
+ // the generic type args, even though we had a return type context.
+ MyFuture<num> f3 = /*info:UNNECESSARY_CAST*/ foo().then(
+ /*@returnType=double*/ (/*@type=dynamic*/ _) => 2.3) as MyFuture<double>;
+}
+
+MyFuture foo() => new MyFuture<int>.value(1);

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