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-rw-r--r--llvm/utils/FileCheck/FileCheck.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index 9e6a6a2..9245e11 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -1212,6 +1212,10 @@ static bool ValidateCheckPrefixes() {
I != E; ++I) {
StringRef Prefix(*I);
+ // Reject empty prefixes.
+ if (Prefix == "")
+ return false;
+
if (!PrefixSet.insert(Prefix))
return false;