Rust

This is awesome. It gets closer to Deno which I think is one of the only things that have actually solved the "ad hoc scripting" challenge, which requires:

1. Easy to install language.
2. Easy to use third party dependencies (from a single file script).
3. Easy to import from other files without setting up a whole project.
4. IDE support.

At one end we have Deno which nails all of those. At the other, Python which fails all of them pretty miserably (despite this being one the most popular use cases for Python).

Seems like with this Rust will have 1 and 2 solved, and I guess 4 isn't too hard. What about 3 though?

If I eventually decide I want to split my one file script into two files will I be able to?

Edit: I had a play and actually it's good news!

• If you want to split up a script you can just do mod foo and it will look for foo.rs (or I guess foo/mod.rs) in the same directory!
• For common code, which you might want to import from e.g. ../../common you can't just use mod but you can add common = { path = "../../common" } to [dependencies]. That directory has to be a proper crate with Cargo.toml but I think that's ok and probably desirable.

The only downsides I found are:

1. No IDE support yet.
2. It prints compilation messages to stdout, which kind of sucks.
3. Even after it has been built, it still does incremental compilation every time you run it, leading to more compilation message noise, and ~100ms startup time.