syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> ty::EarlyBinder<'tcx, ty::Binder<'tcx, ty::CoroutineWitnessTypes<TyCtxt<'tcx>>>> {
context_before:     def_id: DefId,
context_after:     let coroutine_layout = tcx.mir_coroutine_witnesses(def_id);