Index: cfe/trunk/tools/libclang/CIndex.cpp
===================================================================
--- cfe/trunk/tools/libclang/CIndex.cpp
+++ cfe/trunk/tools/libclang/CIndex.cpp
@@ -1025,8 +1025,9 @@
             [&SM](Decl *A, Decl *B) {
     SourceLocation L_A = A->getLocStart();
     SourceLocation L_B = B->getLocStart();
-    assert(L_A.isValid() && L_B.isValid());
-    return SM.isBeforeInTranslationUnit(L_A, L_B);
+    return L_A != L_B ?
+           SM.isBeforeInTranslationUnit(L_A, L_B) :
+           SM.isBeforeInTranslationUnit(A->getLocEnd(), B->getLocEnd());
   });
 
   // Now visit the decls.