Heavyweight vergen

[stefnotch]

So I updated my chumsky, and noticed that my lockfile suddenly gained around 1000 new lines.
Apparently vergen causes the extra dependencies. 136f882

I'm not worrying too much about it, since the (from scratch) compile times for me are still pretty fast, but I figured I'd let you know.

[stefnotch]

It might be possible to put vergen into its own feature, and then use https://docs.rs/about/metadata to specify --features ....
That way, vergen would only do its magic on docs.rs.

(The alternative of using cfg(doc) doesn't seem to be a thing at the moment.)

A more ideal solution would might be something like rust-lang/docs.rs#132 or maybe messing around with Rustdoc's scrape-examples feature.

[zesterer]

Thanks, this is useful to know. I'll try to get some time to sort this out in a nicer way when I'm back in a week.

[stefnotch]

Ooh, chumsky already uses a funny trick to make cfg(docsrs) work. Then making vergen an optional dependency that only gets activated when docsrs is a thing should work.