[pseudo] Add missing header guard for Forest.h

diff --git a/clang-tools-extra/pseudo/include/clang-pseudo/Forest.h b/clang-tools-extra/pseudo/include/clang-pseudo/Forest.h
index 650f913..2b22fd5 100644 (file)
--- a/clang-tools-extra/pseudo/include/clang-pseudo/Forest.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/Forest.h
@@ -17,6 +17,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifndef CLANG_PSEUDO_FOREST_H
+#define CLANG_PSEUDO_FOREST_H
+
 #include "clang-pseudo/Grammar.h"
 #include "clang-pseudo/Token.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -176,3 +179,5 @@ private:
 
 } // namespace pseudo
 } // namespace clang
+
+#endif // CLANG_PSEUDO_FOREST_H