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da493c91d6
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`