{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"AngleBracketedArg::Constraint(constraint)"}]}
                        AngleBracketedArg::Constraint(constraint) => {
                        // `Iterator<Item = Debug>` are allowed to contain nested `impl Trait`.
                            self.with_impl_trait(None, |this| {