include type parameters on generic sync/async functions

fixes #538

[email protected]

Review URL: https://codereview.chromium.org/1935823002 .

Author: harryterkelsen

pkg/dev_compiler/lib/src/compiler/code_generator.dart

@@ -1881,6 +1881,7 @@ class CodeGenerator extends GeneralizingAstVisitor
           new JS.Block([
             _emitGeneratorFunctionBody(element, parameters, body).toReturn()
           ]),
+          typeParams: _emitTypeFormals(type.typeFormals),
           returnType: emitTypeRef(type.returnType));
     }
 

pkg/dev_compiler/test/codegen/language/generic_async_star_test.dart

@@ -0,0 +1,19 @@
+// Copyright (c) 2016, 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 'dart:async';
+
+Stream/*<T>*/ foo/*<T>*/(/*=T*/ x) async* {
+  for (int i = 0; i < 3; i++) {
+    yield x;
+  }
+}
+
+main() async {
+  await for (var x in foo/*<int>*/(1)) {
+    Expect.equals(1, x);
+  }
+}

pkg/dev_compiler/test/codegen/language/generic_async_test.dart

@@ -0,0 +1,13 @@
+// Copyright (c) 2016, 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 'dart:async';
+
+Future/*<T>*/ foo/*<T>*/(/*=T*/ x) async => x;
+
+main() async {
+  Expect.equals(1, await foo/*<int>*/(1));
+}

pkg/dev_compiler/test/codegen/language/generic_sync_star_test.dart

@@ -0,0 +1,18 @@
+// Copyright (c) 2016, 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";
+
+
+Iterable/*<T>*/ foo/*<T>*/(/*=T*/ x) sync* {
+  for (int i = 0; i < 3; i++) {
+    yield x;
+  }
+}
+
+main() {
+  for (var x in foo/*<int>*/(1)) {
+    Expect.equals(1, x);
+  }
+}