1 files changed, 17 insertions, 0 deletions
diff --git a/test/Sema/struct-compat.c b/test/Sema/struct-compat.c
new file mode 100644
index 000000000000..35d8fb1aa0c2
--- /dev/null
+++ b/test/Sema/struct-compat.c
@@ -0,0 +1,17 @@
+/* RUN: clang-cc %s -fsyntax-only -pedantic -verify
+ */
+
+extern struct {int a;} x; // expected-note {{previous definition is here}}
+extern struct {int a;} x; // expected-error {{redefinition of 'x'}}
+
+struct x;
+int a(struct x* b) {
+// Per C99 6.7.2.3, since the outer and inner "struct x"es have different
+// scopes, they don't refer to the same type, and are therefore incompatible
+struct x {int a;} *c = b; // expected-warning {{incompatible pointer types}}
+}
+
+struct x {int a;} r;
+int b() {
+struct x {char x;} s = r; // expected-error {{incompatible type initializing}}
+}