1 files changed, 44 insertions, 0 deletions
diff --git a/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p1.cpp b/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p1.cpp
new file mode 100644
index 0000000000..692ae8f4c1
--- /dev/null
+++ b/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p1.cpp
@@ -0,0 +1,44 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+
+// We have to avoid ADL for this test.
+
+template <unsigned N> class test {};
+
+class foo {};
+test<0> foo(foo); // expected-note {{candidate}}
+
+namespace A {
+  class foo { int x; };
+  test<1> foo(class foo);
+
+  namespace B {
+    test<2> foo(class ::foo); // expected-note {{candidate}}
+
+    void test0() {
+      using ::foo;
+
+      class foo a;
+      test<0> _ = (foo)(a);
+    }
+
+    void test1() {
+      using A::foo;
+
+      class foo a;
+      test<1> _ = (foo)(a);
+    };
+
+    void test2() {
+      class ::foo a;
+      
+      // Argument-dependent lookup is ambiguous between B:: and ::.
+      test<0> _0 = foo(a); // expected-error {{call to 'foo' is ambiguous}}
+
+      // But basic unqualified lookup is not.
+      test<2> _1 = (foo)(a);
+
+      class A::foo b;
+      test<2> _2 = (foo)(b); // expected-error {{incompatible type passing}}
+    }
+  }
+}