Report IMPLEMENTS_SUPER_CLASS

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java
index 5bfce3500af603a19f87e8d9a309e0d23b221d65..83b42018876470ee4e0eed32e193413ab2012aad 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/CompileTimeErrorCode.java
@@ -522,6 +522,14 @@ public enum CompileTimeErrorCode implements ErrorCode {
   IMPLEMENTS_REPEATED("'%s' can only be implemented once"),
 
   /**
+   * 7.10 Superinterfaces: It is a compile-time error if the superclass of a class <i>C</i> appears
+   * in the implements clause of <i>C</i>.
+   * 
+   * @param className the name of the class that appears in both "extends" and "implements" clauses
+   */
+  IMPLEMENTS_SUPER_CLASS("'%s' cannot be used in both 'extends' and 'implements' clauses"),
+
+  /**
    * 7.6.1 Generative Constructors: Note that <b>this</b> is not in scope on the right hand side of
    * an initializer.
    * <p>