1 // RUN: %clang_cc1 -verify -std=c++23 -Wall -Wshadow %s
2
f()3 void f() {
4
5 for (using foo = int;true;) {} //expected-warning {{unused type alias 'foo'}}
6
7 switch(using foo = int; 0) { //expected-warning {{unused type alias 'foo'}}
8 case 0: break;
9 }
10
11 if(using foo = int; false) {} // expected-warning {{unused type alias 'foo'}}
12
13 int x; // expected-warning {{unused variable 'x'}}
14 if(using x = int; true) {} // expected-warning {{unused type alias 'x'}}
15
16 using y = int; // expected-warning {{unused type alias 'y'}} \
17 // expected-note 2{{previous declaration is here}}
18
19 if(using y = double; true) {} // expected-warning {{unused type alias 'y'}} \
20 // expected-warning {{declaration shadows a type alias in function 'f'}}
21
22 for(using y = double; true;) { // expected-warning {{declaration shadows a type alias in function 'f'}}
23 y foo = 0;
24 (void)foo;
25 constexpr y var = 0;
26 static_assert(var == 0);
27 }
28 }
29