Check in LLVM r95781.
diff --git a/test/Parser/cxx-attributes.cpp b/test/Parser/cxx-attributes.cpp
new file mode 100644
index 0000000..192193a
--- /dev/null
+++ b/test/Parser/cxx-attributes.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s

+

+class c {

+  virtual void f1(const char* a, ...)

+    __attribute__ (( __format__(__printf__,2,3) )) = 0;

+  virtual void f2(const char* a, ...)

+    __attribute__ (( __format__(__printf__,2,3) )) {}

+};

+