message: add rustc-dev
diff: @@ -15,6 +15,7 @@ steps:
  rustup set profile minimal
  rustup component remove --toolchain=$TOOLCHAIN rust-docs || echo "already removed"
  rustup update --no-self-update $TOOLCHAIN
  + rustup component add --toolchain=$TOOLCHAIN rustc-dev
  rustup default $TOOLCHAIN
  displayName: Install rust
  