Function fail_all_vec

pub fn fail_all_vec<T, E1, E2, F>(
    results: Vec<Result<T, E1>>,
    f: F,
) -> Result<Vec<T>, Vec<E2>>
where
    F: FnMut(Result<T, E1>) -> E2,

If at least one Result is an error, turn all of them into errors. Else, unwrap the Results.

See fail_all for a more generic/low-level version that works with other input containers and doesn’t collect().

Examples

let err = fail_all_vec(
    vec![Ok(A), Err(ErrA), Ok(A)],
    |res| res.err().map(HighLevelErr::from).unwrap_or(HighLevelErr::B(ErrB))
);
// Same length as the original, each element turned into an error.
assert_eq!(err, Err(vec![ErrB.into(), ErrA.into(), ErrB.into()]));