{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
                        let dyn2015_exception = cx.sess().psess.edition == Edition2015
                        //  - https://doc.rust-lang.org/reference/types/trait-object.html#r-type.trait-object.syntax-edition2018
                            && matches!(ty.kind, ast::TyKind::TraitObject(..))