message: only on nightly
diff: @@ -15,7 +15,9 @@ steps:
  rustup set profile minimal
  rustup component remove --toolchain=$TOOLCHAIN rust-docs || echo "already removed"
  rustup update --no-self-update $TOOLCHAIN
  + if [ "$TOOLCHAIN" = "nightly" ]; then
  rustup component add --toolchain=$TOOLCHAIN rustc-dev
  + fi
  rustup default $TOOLCHAIN
  displayName: Install rust
  