1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
2 
3 // libstdc++ 4.6.x contains a bug where it defines std::__atomic[0,1,2] as a
4 // non-inline namespace, then selects one of those namespaces and reopens it
5 // as inline, as a strange way of providing something like a using-directive.
6 // Clang has an egregious hack to work around the problem, by allowing a
7 // namespace to be converted from non-inline to inline in this one specific
8 // case.
9 
10 #ifdef BE_THE_HEADER
11 
12 #pragma clang system_header
13 
14 namespace std {
15   namespace __atomic0 {
16     typedef int foobar;
17   }
18   namespace __atomic1 {
19     typedef void foobar;
20   }
21 
22   inline namespace __atomic0 {}
23 }
24 
25 #else
26 
27 #define BE_THE_HEADER
28 #include "libstdcxx_atomic_ns_hack.cpp"
29 
30 std::foobar fb;
31 
32 using T = void; // expected-note {{here}}
33 using T = std::foobar; // expected-error {{different types ('std::foobar' (aka 'int') vs 'void')}}
34 
35 #endif
36