Fix "missing match arm body" suggestion involving `!` Include the match arm guard in the gated span, so that the suggestion to add a body is correct instead of inserting the body before the guard. Make the suggestion verbose. ``` error: `match` arm with no body --> $DIR/feature-gate-never_patterns.rs:43:9 | LL | Some(_) if false, | ^^^^^^^^^^^^^^^^ | help: add a body after the pattern | LL | Some(_) if false => { todo!() }, | ++++++++++++++ ``` r? `@compiler-errors`