#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(try_trait_v2)]
use std::ops::Try;
fn simple_try_fold_1<A, T, R: Try<Output = A>>(
    iter: impl Iterator<Item = T>,
    mut accum: A,
    mut f: impl FnMut(A, T) -> R,
) -> R {
    todo!()
}
fn main() {}