{"ast_node_type":"other","tokens":[{"end":16,"kind":"keyword","start":0,"text":"}"}]}
        } else {
            Some(self.parent_generics().map_or(0, |g| g.len()) + self.params.len_lifetimes() + idx)
            debug_assert_eq!(self.parent_generics().map(|it| it.def), Some(param.parent));