error[E0004]: non-exhaustive patterns: `_` not covered --> $DIR/precise_pointer_matching-message.rs:3:11 | LL | match 0usize { | ^^^^^^ pattern `_` not covered | = note: the matched value is of type `usize` = note: `usize` does not have a fixed maximum value, so a wildcard `_` is necessary to match exhaustively = help: add `#![feature(precise_pointer_size_matching)]` to the crate attributes to enable precise `usize` matching help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown | LL ~ 0..=usize::MAX => {}, LL + _ => todo!() | error[E0004]: non-exhaustive patterns: `_` not covered --> $DIR/precise_pointer_matching-message.rs:11:11 | LL | match 0isize { | ^^^^^^ pattern `_` not covered | = note: the matched value is of type `isize` = note: `isize` does not have a fixed maximum value, so a wildcard `_` is necessary to match exhaustively = help: add `#![feature(precise_pointer_size_matching)]` to the crate attributes to enable precise `isize` matching help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown | LL ~ isize::MIN..=isize::MAX => {}, LL + _ => todo!() | error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0004`.