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## Summary
Adds support for `PatternMatchMapping` -- i.e., cases like:
```python
match foo:
case {"a": 1, "b": 2, **rest}:
pass
```
Unfortunately, this node has _three_ kinds of dangling comments:
```python
{ # "open parenthesis comment"
key: pattern,
** # end-of-line "double star comment"
# own-line "double star comment"
rest # end-of-line "after rest comment"
# own-line "after rest comment"
}
```
Some of the complexity comes from the fact that in `**rest`, `rest` is
an _identifier_, not a node, so we have to handle comments _after_ it as
dangling on the enclosing node, rather than trailing on `**rest`. (We
could change the AST to use `PatternMatchAs` there, which would be more
permissive than the grammar but not totally crazy -- `PatternMatchAs` is
used elsewhere to mean "a single identifier".)
Closes https://github.com/astral-sh/ruff/issues/6644.
## Test Plan
`cargo test`
|
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|---|---|---|
| .. | ||
| comments | ||
| expression | ||
| module | ||
| other | ||
| pattern | ||
| snapshots | ||
| statement | ||
| type_param | ||
| builders.rs | ||
| cli.rs | ||
| context.rs | ||
| generated.rs | ||
| lib.rs | ||
| main.rs | ||
| options.rs | ||
| prelude.rs | ||
| verbatim.rs | ||