formatter: debug panic in placement::find_pos_only_slash_offset #5176
Description
while working on comments inside tuple unpacking between stars and name (following #5167 (comment) )
i was wondering if function arguments could have the same issue. in trying to test that i found my test case violates this debug assert
$ cat ../../scratch.py
def foo(
a=2 ** 3 # trailing
):
...
$ cargo run --bin ruff_python_formatter -- --emit stdout ../../scratch.py
[...]
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `RParen`,
right: `Comma`', crates/ruff_python_formatter/src/comments/placement.rs:846:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
commit: be11cae