syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"ty::CoroutineClosure(def_id,"}]}
source_snippet:                     ty::CoroutineClosure(def_id, args) => {
context_before:                     }
context_after:                         (def_id, UpvarArgs::CoroutineClosure(args), None)