{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"TyKind::FnDef(..)"}]}
            TyKind::FnDef(..) | TyKind::Coroutine(..) | TyKind::Closure(..) => {
            }
                never!("Unexpected unnameable type in variance computation: {:?}", ty);