30 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify=expected -std=c++23 -Wall %s2// RUN: %clang_cc1 -fsyntax-only -verify=expected,expected-cxx20 -std=c++20 -Wall %s3 4namespace ns {5 int i;6 enum class e {};7}8void f() {9 10 for (using foo = int;true;); //expected-cxx20-warning {{alias declaration in this context is a C++23 extension}}11 12 switch(using foo = int; 0) { //expected-cxx20-warning {{alias declaration in this context is a C++23 extension}}13 case 0: break;14 }15 16 if(using foo = int; false) {} //expected-cxx20-warning {{alias declaration in this context is a C++23 extension}}17 18 19 if (using enum ns::e; false){} // expected-error {{expected '='}}20 21 for (using ns::i; true;); // expected-error {{expected '='}}22 23 if (using ns::i; false){} // expected-error {{expected '='}}24 25 switch(using ns::i; 0) { // expected-error {{expected '='}}26 case 0: break;27 }28 29}30