1 files changed, 11 insertions, 0 deletions
diff --git a/clang/test/Preprocessor/macro_paste_hashhash.c b/clang/test/Preprocessor/macro_paste_hashhash.c
new file mode 100644
index 0000000..f4b03be
--- /dev/null
+++ b/clang/test/Preprocessor/macro_paste_hashhash.c
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -E %s | FileCheck %s
+#define hash_hash # ## # 
+#define mkstr(a) # a 
+#define in_between(a) mkstr(a) 
+#define join(c, d) in_between(c hash_hash d) 
+// CHECK: "x ## y";
+join(x, y);
+
+#define FOO(x) A x B
+// CHECK: A ## B;
+FOO(##);