Auto merge of #29441 - Ryman:match_refactor_msg, r=alexcrichton

This helps for the case where a match, such as below:
```rust
let foo = match foo {
    Some(x) => x,
    None => 0
};
```
gets refactored to no longer need the match, but the match keyword has been left accidentally: 

```rust
let foo = match foo.unwrap_or(0);
```

This can be hard to spot as the expression grows more complex.

r? @alexcrichton 

0 files changed, 0 insertions, 0 deletions