1 // RUN: %clang_cc1 -std=c++20 -fsyntax-only %s -pedantic -verify 2 3 #define UIE __attribute__((using_if_exists)) 4 5 namespace NS { 6 typedef int x; 7 } 8 9 using NS::x __attribute__((using_if_exists)); 10 11 using NS::x [[clang::using_if_exists]]; // expected-warning{{ISO C++ does not allow an attribute list to appear here}} 12 13 [[clang::using_if_exists]] // expected-warning{{ISO C++ does not allow an attribute list to appear here}} 14 using NS::not_there, 15 NS::not_there2; 16 17 using NS::not_there3, // expected-error {{no member named 'not_there3' in namespace 'NS'}} 18 NS::not_there4 [[clang::using_if_exists]]; // expected-warning{{C++ does not allow an attribute list to appear here}} 19 20 [[clang::using_if_exists]] using NS::not_there5 [[clang::using_if_exists]]; // expected-warning 2 {{ISO C++ does not allow}} 21 22 struct Base {}; 23 struct Derived : Base { 24 [[clang::using_if_exists]] using Base::x; // expected-warning {{ISO C++ does not allow an attribute list to appear here}} 25 using Base::y [[clang::using_if_exists]]; // expected-warning {{ISO C++ does not allow an attribute list to appear here}} 26 [[clang::using_if_exists]] using Base::z, Base::q; // expected-warning {{C++ does not allow an attribute list to appear here}} 27 }; 28