error[E0080]: could not evaluate constant pattern --> $DIR/const-eval-overflow-2.rs:25:9 | LL | const NEG_NEG_128: i8 = -NEG_128; | -------- attempt to negate with overflow ... LL | NEG_NEG_128 => println!("A"), | ^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0080`.