Provide a more convinient way of developing rustc on NixOS
This PR adds envrc files which, once symlinked as `.envrc` will activates a dev shell from `src/tools/nix-dev-shell/flake.nix` or `src/tools/nix-dev-shell/shell.nix`.
This is based on
- [Current rustc dev guide recommendation for NixOS](https://rustc-dev-guide.rust-lang.org/building/suggested.html?highlight=nix#using-nix-shell)
- https://github.com/oxalica/rust-overlay?tab=readme-ov-file#use-in-devshell-for-nix-develop
- [Nora's `x` nix package](
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| .. | ||
| bootstrap | ||
| ci | ||
| doc | ||
| etc | ||
| gcc@fd3498bff0 | ||
| librustdoc | ||
| llvm-project@3a17f74904 | ||
| rustdoc-json-types | ||
| tools | ||
| README.md | ||
| stage0 | ||
| version | ||
This directory contains some source code for the Rust project, including:
- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.