Per C++ [over.match.copy]p1, direct-initialization of a reference can

only invoke converting constructors of the reference's underlying type.

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp b/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
index e775e8f0e3c..869fc4f0149 100644
--- a/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
+++ b/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
@@ -61,3 +61,12 @@ namespace test3 {
     unsigned &t9 = (a->bitY += 3); // expected-error {{non-const reference cannot bind to bit-field 'bitY'}}
   }
 }
+
+namespace explicit_ctor {
+  struct A {};
+  struct B { // expected-note 2{{candidate}}
+    explicit B(const A&);
+  };
+  A a;
+  const B &b(a); // expected-error {{no viable conversion}}
+}