syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":".instantiate(self.infcx.tcx,"}]}
source_snippet:                 .instantiate(self.infcx.tcx, args)
context_before:                 .coroutine_hidden_types(def_id)
context_after:                 .map_bound(|witness| witness.types.to_vec()),