add an assertion
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51645 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/Rewriter.cpp b/lib/Rewrite/Rewriter.cpp
index bea7c00..e1a6651 100644
--- a/lib/Rewrite/Rewriter.cpp
+++ b/lib/Rewrite/Rewriter.cpp
@@ -100,6 +100,7 @@
unsigned Rewriter::getLocationOffsetAndFileID(SourceLocation Loc,
unsigned &FileID) const {
+ assert(Loc.isValid() && "Invalid location");
std::pair<unsigned,unsigned> V = SourceMgr->getDecomposedFileLoc(Loc);
FileID = V.first;
return V.second;