1 files changed, 9 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/decl-init-ref.cpp b/clang/test/SemaCXX/decl-init-ref.cpp
index 42b9286852c..fb5ca8c1491 100644
--- a/clang/test/SemaCXX/decl-init-ref.cpp
+++ b/clang/test/SemaCXX/decl-init-ref.cpp
@@ -36,3 +36,12 @@ namespace PR16502 {
   int f();
   const A &c = { 10, ++c.temporary };
 }
+
+namespace IncompleteTest {
+  struct String;
+  // expected-error@+1 {{reference to incomplete type 'const IncompleteTest::String' could not bind to an lvalue of type 'const char [1]'}}
+  void takeString(const String& = "") {} // expected-note {{passing argument to parameter here}} expected-note {{candidate function}}
+  void test() {
+        takeString(); // expected-error {{no matching function for call}}
+  }
+}