Micha Reiser df2efe81c8 Respect magic trailing comma for set expression (#5782) ...

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## Summary

This PR uses the `join_comma_separated` builder for formatting set
expressions
to ensure the formatting preserves magic commas, if the setting is
enabled.
<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan
See the fixed black tests

<!-- How was it tested? -->

2023-07-15 16:40:38 +00:00

..

snapshots

Respect magic trailing comma for set expression (#5782)

2023-07-15 16:40:38 +00:00

fixtures.rs

Format target: annotation = value? expressions (#5661)

2023-07-11 16:40:28 +02:00