Support for same prefix for multiple imports.

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

Index: compiler/java/com/google/dart/compiler/resolver/Scope.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Scope.java b/compiler/java/com/google/dart/compiler/resolver/Scope.java
index 7175766ef2ae035ccae399585b40a5647a12e0cb..f76adf20288db1428160f36ad2120a0b1292cf7e 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Scope.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Scope.java
@@ -38,6 +38,21 @@ public class Scope {
   }
 
   public Element declareElement(String name, Element element) {
+//    // One prefix can be used to import several libraries.
+//    // So, we wrap LibraryElements into LibraryPrefixElement
+//    if (element instanceof LibraryElement) {

[zundel, 2012/04/21 00:41:17]

remove commented out code.

+//      Element existingElement = elements.get(name);
+//      if (existingElement == null || existingElement instanceof LibraryPrefixElement) {
+//        LibraryPrefixElement prefixElement = (LibraryPrefixElement) existingElement;
+//        if (prefixElement == null) {
+//          prefixElement = new LibraryPrefixElementImplementation(name, this);
+//          elements.put(name, prefixElement);
+//        }
+//        prefixElement.addLibrary((LibraryElement) element);
+//        return null;
+//      }
+//    }
+//    // Normal element.
     return elements.put(name, element);
   }