Report CTEC.AMBIGUOUS_EXPORT

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java
index a8023d496e2faed32dabef08eb3fb58c24a38f7e..7a7fe5d0da7e5b69cf4bb6817dd6471d5706c4eb 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/Namespace.java
@@ -15,6 +15,7 @@ package com.google.dart.engine.internal.scope;
 
 import com.google.dart.engine.element.Element;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -29,7 +30,7 @@ public class Namespace {
    * A table mapping names that are defined in this namespace to the element representing the thing
    * declared with that name.
    */
-  private HashMap<String, Element> definedNames;
+  private final HashMap<String, Element> definedNames;
 
   /**
    * An empty namespace.
@@ -63,6 +64,6 @@ public class Namespace {
    * @return a table containing the same mappings as those defined by this namespace
    */
   public Map<String, Element> getDefinedNames() {
-    return new HashMap<String, Element>(definedNames);
+    return Collections.unmodifiableMap(definedNames);
   }
 }