{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":".chain(ty.ret_type().and_then(|it|"}]}
                    .chain(ty.ret_type().and_then(|it| it.ty())),
                    .flat_map(|params| params.params().filter_map(|param| param.ty()))
                |ty| substitute_type_in_bound(ty, param_name, replacement),