syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::Coroutine(def_id,"}]}
source_snippet:                     ty::Coroutine(def_id, args) => {
context_before:                     ty::Closure(def_id, args) => (def_id, UpvarArgs::Closure(args), None),
context_after:                         (def_id, UpvarArgs::Coroutine(args), Some(tcx.coroutine_movability(def_id)))