Perform type inference on default values of optional/named parameters.

pkg/front_end/testcases/inference/parameter_defaults_upwards.dart

Index: pkg/front_end/testcases/inference/parameter_defaults_upwards.dart
diff --git a/pkg/front_end/testcases/inference/parameter_defaults_upwards.dart b/pkg/front_end/testcases/inference/parameter_defaults_upwards.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8ed6133f1ea1d7180ae799eaf490691020588956
--- /dev/null
+++ b/pkg/front_end/testcases/inference/parameter_defaults_upwards.dart
@@ -0,0 +1,34 @@
+// 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;
+
+class C<T> {
+  C.optional(void func([T x])) {}
+  C.named(void func({T x})) {}
+}
+
+void optional_toplevel([x = /*@typeArgs=int*/ const [0]]) {}
+
+void named_toplevel({x: /*@typeArgs=int*/ const [0]}) {}
+
+main() {
+  void optional_local([x = /*@typeArgs=int*/ const [0]]) {}
+  void named_local({x: /*@typeArgs=int*/ const [0]}) {}
+  var /*@type=C<dynamic>*/ c_optional_toplevel =
+      new /*@typeArgs=dynamic*/ C.optional(optional_toplevel);
+  var /*@type=C<dynamic>*/ c_named_toplevel =
+      new /*@typeArgs=dynamic*/ C.named(named_toplevel);
+  var /*@type=C<dynamic>*/ c_optional_local =
+      new /*@typeArgs=dynamic*/ C.optional(optional_local);
+  var /*@type=C<dynamic>*/ c_named_local =
+      new /*@typeArgs=dynamic*/ C.named(named_local);
+  var /*@type=C<dynamic>*/ c_optional_closure =
+      new /*@typeArgs=dynamic*/ C.optional(/*@returnType=Null*/ (
+          [/*@type=dynamic*/ x = /*@typeArgs=int*/ const [0]]) {});
+  var /*@type=C<dynamic>*/ c_named_closure = new /*@typeArgs=dynamic*/ C.named(
+      /*@returnType=Null*/ (
+          {/*@type=dynamic*/ x: /*@typeArgs=int*/ const [0]}) {});
+}