syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"ty::Closure(def_id,"}]}
source_snippet:         ty::Closure(def_id, args) => {
context_before:         }
context_after:             let sig = tcx.instantiate_bound_regions_with_erased(args.as_closure().sig());