Changelog #283

#19634, #19629 allow unsetting env vars in extraEnv configs.

#19479, #19676, #19672, #19675 add some new diagnostics for incorrect generic arguments.

#19692 add an assist to remove underscores from used variables.

#19653 parse super let.

#19643 parse generic consts.

#19622 (first contribution) fix some bugs in the string rewriting assists.

#19604 (first contribution) add semicolon to use completion.

#19657 improve support for offset_of!().

#19636 fix completion_snippets_custom config always erroring out.

#19650 support unstable UnsafePinned struct in type layout computation.

#19647 fix panics in inlay hints that produce empty text edits for closure return types.

#19684 report error when unable to parse a DiscoverProjectMessage.

#19678 arena-allocate LifetimeRefs.

#19655 fold hygiene map into the bindings themselves.

#19677 remove WherePredicateTypeTarget.

#19644 make predefined symbols const instead of static.

#19688 add some missing shrink_to_fit()s and upgrade dashmap and hashbrown.

#19624 bump chalk to make the generic parameter order match rustc.

#19661 bump salsa.