{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":".hir_get_generics(impl_m.def_id.expect_local())"}]}
        .hir_get_generics(impl_m.def_id.expect_local())
    let span = tcx
        .expect("expected impl item to have generics or else we can't compare them")