1 files changed, 9 insertions, 0 deletions

diff --git a/test/Parser/cxx-default-args.cpp b/test/Parser/cxx-default-args.cpp
new file mode 100644
index 0000000000000..a084fb0812bac
--- /dev/null
+++ b/test/Parser/cxx-default-args.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// PR6647
+class C {
+  // After the error, the rest of the tokens inside the default arg should be
+  // skipped, avoiding a "expected ';' after class" after 'undecl'.
+  void m(int x = undecl + 0); // expected-error {{use of undeclared identifier 'undecl'}}
+};
+