steps:
  - bash: |
      set -e -x
      curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $TOOLCHAIN
      source $HOME/.cargo/env
      echo "##vso[task.prependpath]$HOME/.cargo/bin"
      rustup --version
    displayName: Install rustup
    condition: eq(variables['Agent.OS'], 'Darwin')
  - bash: |
      set -e -x
      rustup --version
      rustup default $TOOLCHAIN
      rustup update --no-self-update $TOOLCHAIN
      rustup toolchain install stable
      rustup component add rustfmt --toolchain stable
    displayName: Configure rust
  - bash: |
      set -x
      rustc -Vv
      cargo -Vv
      cargo +stable fmt --version
    displayName: Query rustc, cargo, and rustfmt versions