r? @brotzeit

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Sorry for not giving an approval though I looked at it. I'm a little hesitant since I don't know for sure if this will work. But if you didn't encounter any issues while using it, it's probably fine ?

While this works for the simple functions rust-compile etc., it does not for generic compile. Hence there is no way to customize the command line used; for example I often need to either cd subdir; cargo build or cargo run --bin something.

I've hacked together an alternative at #401.