// Copyright 2025 The Jujutsu Authors//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// https://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License. //! Iterator helpers. /// Returns `Ok(true)` if any element satisfies the fallible predicate,/// `Ok(false)` if none do. Returns `Err` on the first error encountered.pub async fn fallible_any<T, E>(    iter: impl IntoIterator<Item = T>,    mut predicate: impl AsyncFnMut(T) -> Result<bool, E>,) -> Result<bool, E> {    for item in iter {        if predicate(item).await? {            return Ok(true);        }    }    Ok(false)} /// Returns `Ok(Some(item))` for the first element where the predicate returns/// `Ok(true)`, `Ok(None)` if no element satisfies it, or `Err` on the first/// error.pub async fn fallible_find<T, E>(    iter: impl IntoIterator<Item = T>,    mut predicate: impl AsyncFnMut(&T) -> Result<bool, E>,) -> Result<Option<T>, E> {    for item in iter {        if predicate(&item).await? {            return Ok(Some(item));        }    }    Ok(None)} /// Returns `Ok(Some(index))` for the first element where the predicate returns/// `Ok(true)`, `Ok(None)` if no element satisfies it, or `Err` on the first/// error.pub async fn fallible_position<T, E>(    iter: impl IntoIterator<Item = T>,    mut predicate: impl AsyncFnMut(T) -> Result<bool, E>,) -> Result<Option<usize>, E> {    for (index, item) in iter.into_iter().enumerate() {        if predicate(item).await? {            return Ok(Some(index));        }    }    Ok(None)}