Issue 5735. Fix for 'export' without 'import'

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

Index: compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java b/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
index b72e73aa05599cc8045b6cacafbdd7aa24dda23a..2a4e52b933eb38a420af520becab31c69e16f81f 100644
--- a/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
+++ b/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
@@ -144,8 +144,14 @@ public class TopLevelElementBuilder {
     // Fill "library" export scope with re-exports.
     for (LibraryExport export : library.getExports()) {
       LibraryUnit lib = export.getLibrary();
+      fillInLibraryScope(lib, listener);
       for (Element element : lib.getElement().getExportedElements()) {
         String name = element.getName();
+        // re-export only in not defined locally
+        if (scope.findLocalElement(name) != null) {
+          continue;
+        }
+        // check if show/hide combinators of "export" are satisfied
         if (export.isVisible(name)) {
           Elements.addExportedElement(library.getElement(), element);
         }