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-rw-r--r--clang/lib/Basic/IdentifierTable.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Basic/IdentifierTable.cpp b/clang/lib/Basic/IdentifierTable.cpp
index 92cc179b8e6..4869ae1056b 100644
--- a/clang/lib/Basic/IdentifierTable.cpp
+++ b/clang/lib/Basic/IdentifierTable.cpp
@@ -20,6 +20,7 @@
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/ErrorHandling.h"
+#include <cctype>
#include <cstdio>
using namespace clang;
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