1 files changed, 17 insertions, 0 deletions
diff --git a/clang/test/Preprocessor/macro_paste_hard.c b/clang/test/Preprocessor/macro_paste_hard.c
new file mode 100644
index 0000000..fad8426
--- /dev/null
+++ b/clang/test/Preprocessor/macro_paste_hard.c
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -E %s | grep '1: aaab 2'
+// RUN: %clang_cc1 -E %s | grep '2: 2 baaa'
+// RUN: %clang_cc1 -E %s | grep '3: 2 xx'
+
+#define a(n) aaa ## n
+#define b 2
+1: a(b b)   // aaab 2    2 gets expanded, not b.
+
+#undef a
+#undef b
+#define a(n) n ## aaa
+#define b 2
+2: a(b b)   // 2 baaa    2 gets expanded, not b.
+
+#define baaa xx
+3: a(b b)   // 2 xx
+