Quick tip: if Rust stopped formatting your code ...

Sometimes Rust Analyzer stops formatting my VS Code document and there is no message or explanation why.

This is just one ugly example - lines 46-53 are all over the place.

No matter how many times I press Ctrl+Shift+I the IDE would not fix the formatting or tell me what's wrong.

Turns out there is a simple way to find out why Rust Analyzer fails to format the document: cargo fmt. It will tell you exactly what's broken.

In this case it was a comment on line 44 that got in the way. The document started formatting again as soon as I removed it.

Beware, cargo fmt will attempt to reformat the entire project. Read more about it in https://github.com/rust-lang/rustfmt or run cargo fmt -- --help for options.

I went back to several other files that were not formatting properly, ran cargo fmt on them and quickly fixed the problems. Happy coding!