{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"self.arena.alloc(hir::ConstArg"}]}
        self.arena.alloc(hir::ConstArg { kind: hir::ConstArgKind::Anon(ct), hir_id })
        let hir_id = self.next_id();
    }