c92c9fdc52
7123: Add support for Rust 2021. r=lnicola a=m-ou-se
This adds `2021` in all places where rust-analyzer already knew about `2015` and `2018`.
The only edition-specific behaviour I could find in the source code was gated on a direct comparison with `Edition2015`, so `Edition2021` should (correctly) behave the same as `Edition2018`:
56a7bf7ede/crates/hir_def/src/nameres/path_resolution.rs (L132)
Co-authored-by: Mara Bos <m-ou.se@m-ou.se>
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