Function rustdoc::passes::collect_intra_doc_links::handle_variant

fn handle_variant(
    cx: &DocContext<'_>, 
    res: Res, 
    extra_fragment: &Option<UrlFragment>
) -> Result<(Res, Option<UrlFragment>), ErrorKind<'static>>

Given an enum variant’s res, return the res of its enum and the associated fragment.