When user renames 'prefix' in 'prefix.Class' she actually wants to rename ImportElement.

pkg/analysis_server/test/edit/refactoring_test.dart

Index: pkg/analysis_server/test/edit/refactoring_test.dart
diff --git a/pkg/analysis_server/test/edit/refactoring_test.dart b/pkg/analysis_server/test/edit/refactoring_test.dart
index 2ba16146f3c447278be030d8eb7458d0642b5a9f..b7b0f7a82a86588b837ecea0e9bebd8decc671cc 100644
--- a/pkg/analysis_server/test/edit/refactoring_test.dart
+++ b/pkg/analysis_server/test/edit/refactoring_test.dart
@@ -86,6 +86,24 @@ main() {
 ''', 'import ');
   }
 
+  Future test_rename_hasElement_importElement_prefixDecl() {
+    return assertHasRenameRefactoring('''
+import 'dart:math' as math;
+main() {
+  math.PI;
+}
+''', 'math;');
+  }
+
+  Future test_rename_hasElement_importElement_prefixRef() {

[Brian Wilkerson, 2014/08/18 21:42:34]

Possibly test an ambiguous case.

[scheglov, 2014/08/18 21:49:41]

Done.

+    return assertHasRenameRefactoring('''
+import 'dart:math' as math;
+main() {
+  math.PI;
+}
+''', 'math.PI;');
+  }
+
   Future test_rename_hasElement_instanceGetter() {
     return assertHasRenameRefactoring('''
 class A {