Report INVALID_ASSIGNMENT if default value type cannot be assigned to the parameter type.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
index dac3165ef3f40ba3fc476bf91ae9bb01f135c8b0..8dc41807dd8060808a2ad30c25a3cc01d81a6680 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
@@ -1124,6 +1124,24 @@ public class NonErrorResolverTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_invalidAssignment_defaultValue_named() throws Exception {
+    Source source = addSource(createSource(//
+        "f({String x: '0'}) {",
+        "}"));
+    resolve(source);
+    assertNoErrors();
+    verify(source);
+  }
+
+  public void test_invalidAssignment_defaultValue_optional() throws Exception {
+    Source source = addSource(createSource(//
+        "f([String x = '0']) {",
+        "}"));
+    resolve(source);
+    assertNoErrors();
+    verify(source);
+  }
+
   public void test_invalidAssignment_toDynamic() throws Exception {
     Source source = addSource(createSource(//
         "f() {",