Formatter panic when range formatting certain clause headers with semicolons

[dylwil3]

Summary

Given ex.py with content:

x =7
try:
    a;
finally:
    b

We get:

❯ ruff format --range=2 --diff ex.py
error: Failed to format tarmin.py: syntax error: Expected the keyword token but found another token instead.

This only happens with range formatting, since it comes from this call of self.range:

ruff/crates/ruff_python_formatter/src/statement/clause.rs

Lines 368 to 373 in eb8c0ad

	// Write a source map entry for the colon for range formatting to support formatting the clause header without
	// the clause body. Avoid computing `self.header.range()` otherwise because it's somewhat involved.
	let clause_end = if f.options().source_map_generation().is_enabled() {
	Some(source_position(
	self.header.range(f.context().source())?.end(),
	))

The SimpleTokenizer finding the keyword range is expecting to find Finally but instead it finds the (unnecessary) semi-colon.

Version

No response