message: CONTRIBUTING.md: Use `build --stage 1` instead of `build --stage 2`
  It seems to work fine with `--stage 1` and it should be faster.
diff: @@ -142,20 +142,20 @@ tracing) enabled.
  The setup for a local rustc works as follows:
  ```sh
  # Clone the rust-lang/rust repo.
  -git clone https://github.com/rust-lang/rust/ rustc
  +git clone https://github.com/rust-lang/rust rustc
  cd rustc
  cp config.toml.example config.toml
  # Now edit `config.toml` and set `debug-assertions = true`.
  -# Build a stage 2 rustc.
  +# Build a stage 1 rustc.
  # This step can take 30 minutes or more.
  -./x.py build --stage 2 compiler/rustc
  +./x.py build --stage 1 compiler/rustc
  # If you change something, you can get a faster rebuild by doing
  -./x.py build --keep-stage 0 --stage 2 compiler/rustc
  +./x.py build --keep-stage 0 --stage 1 compiler/rustc
  # You may have to change the architecture in the next command
  -rustup toolchain link custom build/x86_64-unknown-linux-gnu/stage2
  +rustup toolchain link stage1 build/x86_64-unknown-linux-gnu/stage1
  # Now cd to your Miri directory, then configure rustup
  -rustup override set custom
  +rustup override set stage1
  ```
  With this, you should now have a working development setup! See
  