What does the various features do? track-caller? generate-parsing-rs?

[CGMossa]

There are features that I can only guess what they entail.

track-caller? generate-parsing-rs?

I've tried to look, but cannot find a place where there is documentation of the present features

[tyranron]

@CGMossa as Cargo doesn't support public/private features, the common unspoken rule is that if the feature is not described explicitly - it's unlikely you need it, and it's likely an internal one.

generate-parsing-rs is an internal feature for generating fmt syntax parser code, when maintaining this crate.

track-caller is a feature which considers support for #[track_caller] attribute for Rust versions before 1.46.

Nevertheless, you shouldn't bother about them. Just consider using latest 1.0.0-beta.* releases. They doesn't contain such features anymore. And lot of stuff has changed since then, regarding ergonomics.