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

..

ruff_python_formatter__tests__string_processing.snap

Prototype Black's string joining/splitting (#4449)

2023-05-16 18:42:40 +01:00