Is rls supposed to work on a project with both a binary and a library?

When I use RLS with [alacritty](https://github.com/jwilm/alacritty) I get this error "E0463 can't find crate for `alacritty` can't find crate".

Is this supposed to work?

If I add `build_lib: true` to an rls.toml file I don't get any warnings at all in `main.rs`.

I'm on latest master of rls and LanguageClient-neovim