warning: any use of this value will cause an error
  --> $DIR/pub_const_err.rs:6:20
   |
LL | pub const Z: u32 = 0 - 1;
   | -------------------^^^^^-
   |                    |
   |                    attempt to subtract with overflow
   |
note: the lint level is defined here
  --> $DIR/pub_const_err.rs:2:9
   |
LL | #![warn(const_err)]
   |         ^^^^^^^^^

warning: 1 warning emitted