1 /* { dg-do compile } */
2 /* { dg-options "-Wsign-compare" } */
3 
foo()4 int foo()
5 {
6   unsigned char b = '1';
7 
8   bool x = ~b; /* { dg-warning "promoted ~unsigned is always non-zero" } */
9 
10   return 0;
11 }
12