8b08666343
10334: Give rustfmt spawn error context. r=jonas-schievink a=aDotInTheVoid
This mean if you misconfigure to
```json
{
"rust-analyzer.rustfmt.overrideCommand": [
"./nonono"
]
}
```
The error message is
```
[Error - 17:54:33] Request textDocument/formatting failed.
Message: Failed to spawn "./nonono"
Code: -32603
```
instead of
```
[Error - 17:56:12] Request textDocument/formatting failed.
Message: No such file or directory (os error 2)
Code: -32603
```
I'm not sure how to test this, or if it needs a test.
Co-authored-by: Nixon Enraght-Moony <nixon.emoony@gmail.com>
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