1 files changed, 50 insertions, 0 deletions
diff --git a/test/Misc/diag-macro-backtrace2.c b/test/Misc/diag-macro-backtrace2.c
new file mode 100644
index 000000000000..af79bbde6009
--- /dev/null
+++ b/test/Misc/diag-macro-backtrace2.c
@@ -0,0 +1,50 @@
+// RUN: not %clang -cc1 -fsyntax-only %s 2>&1 | FileCheck %s
+
+#define a b
+#define b c
+#define c(x) d(x)
+#define d(x) x*1
+
+#define e f
+#define f g
+#define g(x) h(x)
+#define h(x) x
+
+void PR16799() {
+  const char str[] = "string";
+  a(str);
+  // CHECK: :15:3: error: invalid operands to binary expression
+  // CHECK:       ('const char *' and 'int')
+  // CHECK:   a(str);
+  // CHECK:   ^~~~~~
+  // CHECK: :3:11: note: expanded from macro 'a'
+  // CHECK: #define a b
+  // CHECK:           ^
+  // CHECK: :4:11: note: expanded from macro 'b'
+  // CHECK: #define b c
+  // CHECK:           ^
+  // CHECK: :5:14: note: expanded from macro 'c'
+  // CHECK: #define c(x) d(x)
+  // CHECK:              ^~~~
+  // CHECK: :6:15: note: expanded from macro 'd'
+  // CHECK: #define d(x) x*1
+  // CHECK:              ~^~
+
+  e(str);
+  // CHECK: :33:5: warning: expression result unused
+  // CHECK:   e(str);
+  // CHECK:     ^~~
+  // CHECK: :8:11: note: expanded from macro 'e'
+  // CHECK: #define e f
+  // CHECK:           ^
+  // CHECK: :9:11: note: expanded from macro 'f'
+  // CHECK: #define f g
+  // CHECK:           ^
+  // CHECK: :10:16: note: expanded from macro 'g'
+  // CHECK: #define g(x) h(x)
+  // CHECK:                ^
+  // CHECK: :11:14: note: expanded from macro 'h'
+  // CHECK: #define h(x) x
+  // CHECK:              ^
+}
+// CHECK: 1 warning and 1 error generated.