error[E0080]: evaluation of constant value failed
  --> $DIR/erroneous_const2.rs:LL:CC
   |
LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
   |                   ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.