Function rustdoc::passes::collect_intra_doc_links::traits_implemented_by

fn traits_implemented_by<'a>(
    cx: &mut DocContext<'a>, 
    ty: Ty<'a>, 
    module: DefId
) -> FxHashSet<DefId>

Given a type, return all traits in scope in module implemented by that type.

NOTE: this cannot be a query because more traits could be available when more crates are compiled! So it is not stable to serialize cross-crate.