Merge #1432

1432: Make fill_match_arm work with trivial arm r=matklad a=ironyman

Addresses this issue https://github.com/rust-analyzer/rust-analyzer/issues/1399

One minor issue I noticed is that complete_postfix creates an arm like this

```
                match E::X {
                    <|>_ => {},
                }
```

but fill_match_arms creates arms like this
```
                     E::X => (), 
```

Co-authored-by: ironyman <[email protected]>
Co-authored-by: Changyu Li <[email protected]>

0 files changed, 0 insertions, 0 deletions