1 // RUN: %clang_cc1 -pedantic -triple x86_64-apple-macos11 -std=c++20 -fsyntax-only -verify %s
2 
3 static_assert(__has_extension(cxx_attributes_on_using_declarations), "");
4 
5 namespace NS { typedef int x; }
6 
7 [[clang::annotate("foo")]] using NS::x; // expected-warning{{ISO C++ does not allow an attribute list to appear here}}
8 
9 
10 [[deprecated]] using NS::x;                                    // expected-warning {{'deprecated' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
11 using NS::x [[deprecated]];                                    // expected-warning {{'deprecated' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
12 using NS::x __attribute__((deprecated));                       // expected-warning {{'deprecated' currently has no effect on a using declaration}}
13 using NS::x __attribute__((availability(macos,introduced=1))); // expected-warning {{'availability' currently has no effect on a using declaration}}
14 
15 [[clang::availability(macos,introduced=1)]] using NS::x; // expected-warning {{'availability' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
16 
17 // expected-warning@+1 3 {{ISO C++ does not allow an attribute list to appear here}}
18 [[clang::annotate("A")]] using NS::x [[clang::annotate("Y")]], NS::x [[clang::annotate("Z")]];
19 
20 template <class T>
21 struct S : T {
22   [[deprecated]] using typename T::x; // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
23   [[deprecated]] using T::y;          // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
24 
25   using typename T::z [[deprecated]]; // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
26   using T::a [[deprecated]];          // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
27 };
28 
29 struct Base {};
30 
31 template <class B>
32 struct DepBase1 : B {
33   using B::B [[]];
34 
35 };
36 template <class B>
37 struct DepBase2 : B {
38   using B::B __attribute__(());
39 };
40 
41 DepBase1<Base> db1;
42 DepBase2<Base> db2;
43