Stable proc macros! Nicer namespaces! Many nice new features in Rust 1.30: https://blog.rust-lang.org/2018/10/25/Rust-1.30.0.html
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I think you could build an interesting IDE with a tiny embedded LLM in addition to the usual tooling.
Features like 'extract method' would be much nicer if an LLM could provide a name. Choosing a good name is virtually impossible from just a typed AST.
I'm experimenting with jj this weekend. It seems pretty nice so far, but the mental model is pretty different from git.
For example, there's no `checkout` command. You do `jj new ABC` to switch to a commit, which creates a new empty commit on top of ABC.
Trying the nix CLI today, and I'm seriously impressed with the formatting of its --help output.
Indented warnings, italics, bullets, even adding a left border to code snippets! It's a nice reminder to take full advantage of terminal features to help the reader.