Fix summarization of unqualified references to class members.

pkg/analyzer/lib/src/summary/summarize_elements.dart

Index: pkg/analyzer/lib/src/summary/summarize_elements.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_elements.dart b/pkg/analyzer/lib/src/summary/summarize_elements.dart
index 4f7a12ae6224c849339a32f55bb35d16a79e0014..168e91be31cbcef6b8994a6f9c974527394efb41 100644
--- a/pkg/analyzer/lib/src/summary/summarize_elements.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_elements.dart
@@ -1030,6 +1030,9 @@ class _ConstExprSerializer extends AbstractConstExprSerializer {
       int lengthRef = serializer._getLengthPropertyReference(prefixRef);
       return new EntityRefBuilder(reference: lengthRef);
     }
+    if (element is TypeParameterElement) {
+      throw new StateError('Constants may not refer to type parameters.');
+    }
     return new EntityRefBuilder(
         reference: serializer._getElementReferenceId(element));
   }