fix: default rustfmt version to supplied rust version (#2660)

Modifies the default of `rustfmt_version` so that it uses the first
version in the `versions` list. If there are multiple versions given
then falls back to the original default of `DEFAULT_NIGHTLY_VERSION`.

We tripped over this where supply a single Rust version (non-nightly),
but started using nightly features in `rustfmt.toml` and could no longer
format directly with `cargo fmt`. This helped align the versions of both
toolchains.

---------

Co-authored-by: Daniel Wagner-Hall <dwagnerhall@apple.com>
3 files changed
tree: 9d363b4faebc35695d5ca9c002e6c5513ea40270
  1. .bazelci/
  2. .bcr/
  3. .github/
  4. bindgen/
  5. cargo/
  6. crate_universe/
  7. docs/
  8. examples/
  9. ffi/
  10. nix/
  11. proto/
  12. rust/
  13. test/
  14. tools/
  15. util/
  16. wasm_bindgen/
  17. .bazelignore
  18. .bazelrc
  19. .clang-format
  20. .envrc
  21. .gitattributes
  22. .gitignore
  23. .prettierrc.toml
  24. .rustfmt.toml
  25. ARCHITECTURE.md
  26. AUTHORS
  27. BUILD.bazel
  28. CODEOWNERS
  29. COMPATIBILITY.md
  30. CONTRIBUTING.md
  31. CONTRIBUTORS
  32. LICENSE.txt
  33. MODULE.bazel
  34. README.md
  35. version.bzl
  36. WORKSPACE.bazel
README.md

Rust Rules

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