1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
3 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
4 
5 namespace A {
6   class A {
7     friend void func(A);
8     friend A operator+(A,A);
9   };
10 }
11 
12 namespace B {
13   class B {
14     static void func(B);
15   };
16   B operator+(B,B);
17 }
18 
19 namespace D {
20   class D {};
21 }
22 
23 namespace C {
24   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}}
25 #if __cplusplus >= 201103L // C++11 or later
26   // expected-note@-2 {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'B::B' to 'C::C &&' for 1st argument}}
27 #endif
28   void func(C); // expected-note {{'C::func' declared here}} \
29                 // expected-note {{passing argument to parameter here}}
30   C operator+(C,C);
31   D::D operator+(D::D,D::D);
32 }
33 
34 namespace D {
35   using namespace C;
36 }
37 
38 namespace Test {
test()39   void test() {
40     func(A::A());
41     // FIXME: namespace-aware typo correction causes an extra, misleading
42     // message in this case; some form of backtracking, diagnostic message
43     // delaying, or argument checking before emitting diagnostics is needed to
44     // avoid accepting and printing out a typo correction that proves to be
45     // incorrect once argument-dependent lookup resolution has occurred.
46     func(B::B()); // expected-error {{use of undeclared identifier 'func'; did you mean 'C::func'?}} \
47                   // expected-error {{no viable conversion from 'B::B' to 'C::C'}}
48     func(C::C());
49     A::A() + A::A();
50     B::B() + B::B();
51     C::C() + C::C();
52     D::D() + D::D(); // expected-error {{invalid operands to binary expression ('D::D' and 'D::D')}}
53   }
54 }
55 
56 // PR6716
57 namespace test1 {
58   template <class T> class A {
59     template <class U> friend void foo(A &, U); // expected-note {{not viable: 1st argument ('const A<int>') would lose const qualifier}}
60 
61   public:
62     A();
63   };
64 
test()65   void test() {
66     const A<int> a;
67     foo(a, 10); // expected-error {{no matching function for call to 'foo'}}
68   }
69 }
70