Initial slang.

Change-Id: I4f84a741e5fbc440cd4c251406d2b611a237f713
diff --git a/test/Parser/argument_redef.c b/test/Parser/argument_redef.c
new file mode 100644
index 0000000..519e8fd
--- /dev/null
+++ b/test/Parser/argument_redef.c
@@ -0,0 +1,6 @@
+/* RUN: %clang_cc1 -fsyntax-only -verify %s
+*/
+
+void foo(int A) { /* expected-note {{previous definition is here}} */
+  int A; /* expected-error {{redefinition of 'A'}} */
+}