Charlie Marsh 4204fc002d Remove exception-handler lexing from unused-bound-exception fix (#5851) ...

## Summary

The motivation here is that it will make this rule easier to rewrite as
a deferred check. Right now, we can't run this rule in the deferred
phase, because it depends on the `except_handler` to power its autofix.
Instead of lexing the `except_handler`, we can use the `SimpleTokenizer`
from the formatter, and just lex forwards and backwards.

For context, this rule detects the unused `e` in:

```python
try:
  pass
except ValueError as e:
  pass
```

2023-07-18 18:27:46 +00:00

1.3 KiB

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