Function rustdoc::clean::get_all_import_attributes

fn get_all_import_attributes<'hir>(
    item: &Item<'hir>,
    tcx: TyCtxt<'hir>,
    target_hir_id: HirId,
    attributes: &mut Vec<Attribute>
)

Because a Use item directly links to the imported item, we need to manually go through each import one by one. To do so, we go to the parent item and look for the Ident into it. Then, if we found the “end item” (the imported one), we stop there because we don’t need its documentation. Otherwise, we repeat the same operation until we find the “end item”.