Test for Issue 16448

tests/compiler/dart2js/simple_inferrer_const_closure_test.dart

Index: tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart b/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7b7be1a6da440c65728f34c064aa84760dbc9292
--- /dev/null
+++ b/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
@@ -0,0 +1,56 @@
+// Copyright (c) 2014, 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.
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+import 'compiler_helper.dart';
+
+const String TEST = """
+
+method1() {
+  return 42;
+}
+
+method2(a) {  // Called only via [foo2] with a small integer.
+  return a;
+}
+
+const foo1 = method1;
+const foo2 = method2;
+
+returnInt1() {
+  return foo1();
+}
+
+returnInt2() {
+  return foo2(54);
+}
+
+main() {
+  returnInt1();
+  returnInt2();
+}
+""";
+
+
+void main() {
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(TEST, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    var typesInferrer = compiler.typesTask.typesInferrer;
+
+    checkReturn(String name, type) {
+      var element = findElement(compiler, name);
+      Expect.equals(type,
+          typesInferrer.getReturnTypeOfElement(element).simplify(compiler),
+          name);
+    }
+
+    checkReturn('method1', compiler.typesTask.uint31Type);
+    checkReturn('returnInt1', compiler.typesTask.uint31Type);
+
+    checkReturn('method2', compiler.typesTask.uint31Type);
+    checkReturn('returnInt2', compiler.typesTask.uint31Type);
+  }));
+}