Report PRIVATE_OPTIONAL_PARAMETER in more cases.

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

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
index 33635b792239a415fc0d4f2ab6d27224b94cd685..e8e820c0480c7873ba0b8ec6045286252223c4cd 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
@@ -2655,6 +2655,25 @@ public class CompileTimeErrorCodeTest extends ResolverTestCase {
 
   public void test_privateOptionalParameter() throws Exception {
     Source source = addSource(createSource(//
+    "f({var _p}) {}"));
+    resolve(source);
+    assertErrors(CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER);
+    verify(source);
+  }
+
+  public void test_privateOptionalParameter_fieldFormal() throws Exception {
+    Source source = addSource(createSource(//
+        "class A {",
+        "  var _p;",
+        "  A({this._p: 0});",
+        "}"));
+    resolve(source);
+    assertErrors(CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER);
+    verify(source);
+  }
+
+  public void test_privateOptionalParameter_withDefaultValue() throws Exception {
+    Source source = addSource(createSource(//
     "f({_p : 0}) {}"));
     resolve(source);
     assertErrors(CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER);