{"ast_node_type":"impl","tokens":[{"end":90,"kind":"keyword","start":0,"text":"tcx.impl_trait_header(def_id).expect(\"expected"}]}
    tcx.impl_trait_header(def_id).expect("expected an impl of trait").trait_ref.map_bound(
) -> ty::EarlyBinder<'_, ty::Clauses<'_>> {
        |trait_ref| {