Initial support for mixins in dartc.

compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java

Index: compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java b/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
index 0d4727ee8d87449d6bc33c499f43428def3a1d26..b77604c1aecd12b8931bb7be3de9e2b6cfd25e89 100644
--- a/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
+++ b/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
@@ -13,6 +13,7 @@ import com.google.dart.compiler.SubSystem;
 public enum ResolverErrorCode implements ErrorCode {
   BLACK_LISTED_EXTENDS("'%s' can not be used as superclass"),
   BLACK_LISTED_IMPLEMENTS("'%s' can not be used as superinterface"),
+  BLACK_LISTED_MIXINS("'%s' can not be used as mixin"),
   BREAK_LABEL_RESOLVES_TO_CASE_OR_DEFAULT("break label resolves to case or default statement"),
   BUILT_IN_IDENTIFIER_AS_TYPE("Built-in identifier '%s' cannot be used as a type annotation"),
   CANNOT_ACCESS_FIELD_IN_INIT("Cannot access an instance field in an initializer expression"),
@@ -100,6 +101,7 @@ public enum ResolverErrorCode implements ErrorCode {
   DUPLICATE_PARAMETER("Duplicate parameter '%s'"),
   DUPLICATE_TOP_LEVEL_DECLARATION("duplicate top-level declaration %s at %s"),
   DUPLICATE_TYPE_VARIABLE("Duplicate type variable '%s'"),
+  DUPLICATE_WITH_TYPE("Duplicate type in the with clause"),
   // TODO(zundel): error message needs JUnit test, (reachable code?)
   EXPECTED_AN_INSTANCE_FIELD_IN_SUPER_CLASS(
       "expected an instance field in the super class, but got %s"),
@@ -197,6 +199,7 @@ public enum ResolverErrorCode implements ErrorCode {
   STATIC_FINAL_REQUIRES_VALUE("Static final fields must have an initial value"),
   STATIC_METHOD_MUST_HAVE_BODY("Static method must have a body"),
   SUPER_CLASS_IN_IMPLEMENTS("Superclass in implements clause"),
+  SUPER_CLASS_IN_WITH("Superclass in with clause"),
   SUPER_IN_FACTORY_CONSTRUCTOR("Cannot use 'super' in a factory constructor"),
   SUPER_IN_STATIC_METHOD("Cannot use 'super' in a static method"),
   SUPER_OUTSIDE_OF_CONSTRUCTOR("Cannot use 'super' constructor outside of a constructor"),