error[E0004]: non-exhaustive patterns: `&_` not covered --> $DIR/issue-30240.rs:2:11 | LL | match "world" { | ^^^^^^^ pattern `&_` not covered | = note: the matched value is of type `&str` = note: `&str` cannot be matched exhaustively, so a wildcard `_` is necessary 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 ~ "hello" => {}, LL + &_ => todo!() | error[E0004]: non-exhaustive patterns: `&_` not covered --> $DIR/issue-30240.rs:6:11 | LL | match "world" { | ^^^^^^^ pattern `&_` not covered | = note: the matched value is of type `&str` = note: `&str` cannot be matched exhaustively, so a wildcard `_` is necessary 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 ~ "hello" => {}, LL + &_ => todo!() | error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0004`.