Report WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER for optional/named parameters.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java
index 0bc7718b4cdad3d59b5b8251b830ab37c9e4e765..7d5885b1e26bd7e4c2fda4fcd98c91ce5c0f7038 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java
@@ -3988,7 +3988,7 @@ public class ErrorVerifier extends RecursiveASTVisitor<Void> {
   }
 
   /**
-   * This verifies if the passed setter parameter list have only one parameter.
+   * This verifies if the passed setter parameter list have only one required parameter.
    * <p>
    * This method assumes that the method declaration was tested to be a setter before being called.
    * 
@@ -4005,12 +4005,11 @@ public class ErrorVerifier extends RecursiveASTVisitor<Void> {
     if (parameterList == null) {
       return false;
     }
-    int numberOfParameters = parameterList.getParameters().size();
-    if (numberOfParameters != 1) {
+    NodeList<FormalParameter> parameters = parameterList.getParameters();
+    if (parameters.size() != 1 || parameters.get(0).getKind() != ParameterKind.REQUIRED) {
       errorReporter.reportError(
           CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER,
-          setterName,
-          numberOfParameters);
+          setterName);
       return true;
     }
     return false;