[index] Add a message for the assertion, NFC.

llvm-svn: 262991

diff --git a/clang/lib/Index/IndexingContext.cpp b/clang/lib/Index/IndexingContext.cpp
index fe814ff25a643abb53f51b647a99434c14f1c614..238de57ccd49e1021bf89f3a86d3c237c71dcbfa 100644 (file)
--- a/clang/lib/Index/IndexingContext.cpp
+++ b/clang/lib/Index/IndexingContext.cpp
@@ -299,7 +299,8 @@ bool IndexingContext::handleDeclOccurrence(const Decl *D, SourceLocation Loc,
     Parent = getCanonicalDecl(Parent);
   assert(!Parent || !Parent->isImplicit() ||
          isa<FunctionDecl>(Parent) ||
-         isa<ObjCInterfaceDecl>(Parent) || isa<ObjCMethodDecl>(Parent));
+         isa<ObjCInterfaceDecl>(Parent) || isa<ObjCMethodDecl>(Parent) &&
+         "unexpected implicit parent!");
 
   SmallVector<SymbolRelation, 6> FinalRelations;
   FinalRelations.reserve(Relations.size()+1);