Function rustdoc::clean::get_all_import_attributes

fn get_all_import_attributes<'hir>(
    cx: &mut DocContext<'hir>,
    import_def_id: LocalDefId,
    target_def_id: DefId,
    is_inline: bool
) -> Vec<(Cow<'hir, Attribute>, Option<DefId>)>

Collect attributes from the whole import chain.