1 // { dg-options -std=c++17 }
2 
3 int
fn(bool b)4 fn (bool b)
5 {
6   int r = 0;
7 
8   r += b++; // { dg-error "use of an operand of type .bool. in .operator\\+\\+. is forbidden in" }
9   r += ++b; // { dg-error "use of an operand of type .bool. in .operator\\+\\+. is forbidden in" }
10   r += b--; // { dg-error "use of an operand of type .bool. in .operator--. is forbidden" }
11   r += --b; // { dg-error "use of an operand of type .bool. in .operator--. is forbidden" }
12 
13   return r;
14 }
15