Match wild err arm improvements
This lint should trigger on other identifiers which have `_` prefix (such as `_e`) and only if they are unused in the panic block.
_Note_: the `is_unused` function is greatly inspired from `pat_is_wild` function in [loops lints](
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| .. | ||
| auxiliary | ||
| ui | ||
| ui-toml | ||
| compile-test.rs | ||
| dogfood.rs | ||
| fmt.rs | ||
| integration.rs | ||
| matches.rs | ||
| missing-test-files.rs | ||
| needless_continue_helpers.rs | ||
| versioncheck.rs | ||