add support for a top-level __extension__ marker, implementing a todo.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Parser/extension.c b/test/Parser/extension.c
new file mode 100644
index 0000000..77a2f17
--- /dev/null
+++ b/test/Parser/extension.c
@@ -0,0 +1,9 @@
+// RUN: clang %s -fsyntax-only
+
+// Top level extension marker.
+
+__extension__ typedef struct
+{
+    long long int quot; 
+    long long int rem; 
+}lldiv_t;