Merge #11690

11690: feat: Add an assist for inlining type aliases r=Veykril a=steven-joruk

I'm working towards implementing #10881, but I'd like to get this in first with earlier feedback.

Is `inline_type_alias` a good enough name? I guess the follow up assist would be called `inline_type_alias_into_all_users` based on that.

![valid_inlines](https://user-images.githubusercontent.com/1277939/158020510-fed78b5c-4c7e-46d1-9151-3044a29b9990.gif)

![invalid_inlines](https://user-images.githubusercontent.com/1277939/158020516-8a2deb6d-c6ec-4adf-a15b-c514fc97dc43.gif)



Co-authored-by: Steven Joruk <steven@joruk.com>
tree: dad1a60d9be59b5902a2553984dbf27022cf237a
  1. .cargo/
  2. .github/
  3. .vscode/
  4. assets/
  5. bench_data/
  6. crates/
  7. docs/
  8. editors/
  9. lib/
  10. xtask/
  11. .gitattributes
  12. .gitignore
  13. bors.toml
  14. Cargo.lock
  15. Cargo.toml
  16. LICENSE-APACHE
  17. LICENSE-MIT
  18. PRIVACY.md
  19. README.md
  20. rustfmt.toml
README.md

rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

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