1 files changed, 64 insertions, 0 deletions
diff --git a/clang/test/CXX/basic/basic.lookup/basic.lookup.argdep/p4.cpp b/clang/test/CXX/basic/basic.lookup/basic.lookup.argdep/p4.cpp
new file mode 100644
index 0000000..32dd75a
--- /dev/null
+++ b/clang/test/CXX/basic/basic.lookup/basic.lookup.argdep/p4.cpp
@@ -0,0 +1,64 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace A {
+  class A {
+    friend void func(A);
+    friend A operator+(A,A);
+  };
+}
+
+namespace B {
+  class B {
+    static void func(B);
+  };
+  B operator+(B,B);
+}
+
+namespace D {
+  class D {};
+}
+
+namespace C {
+  class C {}; // expected-note {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'B::B' to 'const C::C &' for 1st argument}}
+  void func(C); // expected-note {{'C::func' declared here}} \
+                // expected-note {{passing argument to parameter here}}
+  C operator+(C,C);
+  D::D operator+(D::D,D::D);
+}
+
+namespace D {
+  using namespace C;
+}
+
+namespace Test {
+  void test() {
+    func(A::A());
+    // FIXME: namespace-aware typo correction causes an extra, misleading
+    // message in this case; some form of backtracking, diagnostic message
+    // delaying, or argument checking before emitting diagnostics is needed to
+    // avoid accepting and printing out a typo correction that proves to be
+    // incorrect once argument-dependent lookup resolution has occurred.
+    func(B::B()); // expected-error {{use of undeclared identifier 'func'; did you mean 'C::func'?}} \
+                  // expected-error {{no viable conversion from 'B::B' to 'C::C'}}
+    func(C::C());
+    A::A() + A::A();
+    B::B() + B::B();
+    C::C() + C::C();
+    D::D() + D::D(); // expected-error {{invalid operands to binary expression ('D::D' and 'D::D')}}
+  }
+}
+
+// PR6716
+namespace test1 {
+  template <class T> class A {
+    template <class U> friend void foo(A &, U); // expected-note {{not viable: 1st argument ('const A<int>') would lose const qualifier}}
+
+  public:
+    A();
+  };
+
+  void test() {
+    const A<int> a;
+    foo(a, 10); // expected-error {{no matching function for call to 'foo'}}
+  }
+}