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## Summary
It turns out that _some_ identifiers can contain newlines --
specifically, dot-delimited import identifiers, like:
```python
import foo\
.bar
```
At present, we print all identifiers verbatim, which causes us to retain
the `\` in the formatted output. This also leads to violating some debug
assertions (see the linked issue, though that's a symptom of this
formatting failure).
This PR adds detection for import identifiers that contain newlines, and
formats them via `text` (slow) rather than `source_code_slice` (fast) in
those cases.
Closes https://github.com/astral-sh/ruff/issues/7734.
## Test Plan
`cargo test`
|
||
|---|---|---|
| .. | ||
| alias.rs | ||
| arguments.rs | ||
| commas.rs | ||
| comprehension.rs | ||
| decorator.rs | ||
| elif_else_clause.rs | ||
| except_handler_except_handler.rs | ||
| identifier.rs | ||
| keyword.rs | ||
| match_case.rs | ||
| mod.rs | ||
| parameter.rs | ||
| parameter_with_default.rs | ||
| parameters.rs | ||
| with_item.rs | ||