{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"if"}]}
        if self.token.is_lifetime() {
        // e.g. `T: for<'a> 'a` or `T: [const] 'a`.
            let _: ErrorGuaranteed = self.error_lt_bound_with_modifiers(modifiers, binder_span);