syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"ty::CoroutineClosure(coroutine_closure_def_id,"}]}
source_snippet:                     ty::CoroutineClosure(coroutine_closure_def_id, args) => {
context_before:                 match *rcvr_args.type_at(0).kind() {
context_after:                         if target_kind == ClosureKind::FnOnce