dc4d38740e
Shorten error message for callable with wrong return type
```
error: expected `{closure@...}` to return `Ret`, but it returns `Other`
```
instead of
```
error: expected `{closure@...}` to be a closure that returns `Ret`, but it returns `Other`
```
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|---|---|---|
| .. | ||
| error_reporting | ||
| errors | ||
| solve | ||
| traits | ||
| errors.rs | ||
| infer.rs | ||
| lib.rs | ||
| regions.rs | ||
| solve.rs | ||