Flush cached data in JavaScriptConstantCompiler.metadataConstantMap.

dart/tests/try/poi/forget_element_test.dart

Index: dart/tests/try/poi/forget_element_test.dart
diff --git a/dart/tests/try/poi/forget_element_test.dart b/dart/tests/try/poi/forget_element_test.dart
index e60126c799099469a0d340fce76ac31d26027c4b..ba9aadf99bc0794dc1600d185a75a32bf0780123 100644
--- a/dart/tests/try/poi/forget_element_test.dart
+++ b/dart/tests/try/poi/forget_element_test.dart
@@ -6,45 +6,74 @@
 library trydart.forget_element_test;
 
 import 'package:compiler/implementation/elements/elements.dart' show
-    LocalFunctionElement;
+    LocalFunctionElement,
+    MetadataAnnotation;
+
+import 'package:compiler/implementation/js_backend/js_backend.dart' show
+    JavaScriptBackend;
 
 import 'compiler_test_case.dart';
 
 class ForgetElementTestCase extends CompilerTestCase {
   final int expectedClosureCount;
 
-  ForgetElementTestCase(String source, {int closureCount})
+  final int expectedMetadataCount;
+
+  ForgetElementTestCase(
+      String source,
+      {int closureCount: 0,
+       int metadataCount: 0})
       : this.expectedClosureCount = closureCount,
+        this.expectedMetadataCount = metadataCount,
         super(source);
 
   Future run() => compile().then((LibraryElement library) {
 
     // Check that the compiler has recorded the expected number of closures.
-    Expect.equals(expectedClosureCount, closuresInLibrary(library).length);
+    Expect.equals(
+        expectedClosureCount, closuresInLibrary(library).length,
+        'closure count');
+
+    // Check that the compiler has recorded the expected number of metadata
+    // annotations.
+    Expect.equals(
+        expectedMetadataCount, metadataInLibrary(library).length,
+        'metadata count');
 
     // Forget about all elements.
     library.forEachLocalMember(compiler.forgetElement);
 
     // Check that all the closures were forgotten.
-    Expect.isTrue(closuresInLibrary(library).isEmpty);
+    Expect.isTrue(closuresInLibrary(library).isEmpty, 'closures');
+
+    // Check that the metadata annotations were forgotten.
+    Expect.isTrue(metadataInLibrary(library).isEmpty, 'metadata');
   });
 
   Iterable closuresInLibrary(LibraryElement library) {
     return compiler.enqueuer.resolution.universe.allClosures.where(
         (LocalFunctionElement closure) => closure.library == library);
   }
+
+  Iterable metadataInLibrary(LibraryElement library) {
+    JavaScriptBackend backend = compiler.backend;
+    return backend.constants.metadataConstantMap.keys.where(
+        (MetadataAnnotation metadata) {
+          return metadata.annotatedElement.library == library;
+        });
+  }
 }
 
+const String CONSTANT_CLASS = 'class Constant { const Constant(); }';
+
 void main() {
   runTests(
       [
           new ForgetElementTestCase(
-              'main() {}',
-              closureCount: 0),
+              'main() {}'),
 
           new ForgetElementTestCase(
-              'main() => null;',
-              closureCount: 0),
+              'main() => null;'),
 
           new ForgetElementTestCase(
               'main() => (() => null)();',
@@ -57,6 +86,15 @@ void main() {
           new ForgetElementTestCase(
               'main() => (() => (() => (() => null)())())();',
               closureCount: 3),
+
+          new ForgetElementTestCase(
+              '@Constant() main() => null; $CONSTANT_CLASS',
+              metadataCount: 1),
+
+          new ForgetElementTestCase(
+              'main() => ((@Constant() x) => x)(null); $CONSTANT_CLASS',
+              closureCount: 1,
+              metadataCount: 1),
       ]
   );
 }