{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"inputs_and_output.bound_vars().iter().chain(iter::once("}]}
                    inputs_and_output.bound_vars().iter().chain(iter::once(
                let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
                        ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),