Changes:
- Add interned keys to salsa (#150) -- see salsa-rs/salsa-rfcs#2
for more details.
- Fix bugs re: GC and volatile queries
- Optimization for GC (#144), though I think this later got undone
as part of the bug fixes =)
- GC API now more orthogonal + flexible (#138)
- Removed `set_unchecked` testing mechanism (#141)
- Generated enums now squelch `non_camel_case_types` lint (#135)
- Tests now using `set_foo` (#139)
- `Query::group_storage` now called `Query::query_storage` (#142)
Contributors to this release:
- @matklad
- @memoryruins
- @nikomatsakis