{"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"t:"}]}
    t: T,
pub fn par_map<I: DynSend, T: IntoIterator<Item = I>, R: DynSend, C: FromIterator<R>>(
    map: impl Fn(I) -> R + DynSync + DynSend,