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"git": {
"sha1": "3f9c189bddc6ecbacddc298adaa0da3d73397070"
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"path_in_vcs": ""
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.31"
name = "num-iter"
version = "0.1.45"
authors = ["The Rust Project Developers"]
exclude = [
"/ci/*",
"/.github/*",
]
description = "External iterators for generic mathematics"
homepage = "https://github.com/rust-num/num-iter"
documentation = "https://docs.rs/num-iter"
readme = "README.md"
keywords = [
"mathematics",
"numerics",
]
categories = [
"algorithms",
"science",
"no-std",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-num/num-iter"
[package.metadata.docs.rs]
features = ["std"]
[dependencies.num-integer]
version = "0.1.46"
features = ["i128"]
default-features = false
[dependencies.num-traits]
version = "0.2.11"
features = ["i128"]
default-features = false
[build-dependencies.autocfg]
version = "1"
[features]
default = ["std"]
i128 = []
std = [
"num-integer/std",
"num-traits/std",
]

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Copyright (c) 2014 The Rust Project Developers
Permission is hereby granted, free of charge, to any
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# num-iter
[![crate](https://img.shields.io/crates/v/num-iter.svg)](https://crates.io/crates/num-iter)
[![documentation](https://docs.rs/num-iter/badge.svg)](https://docs.rs/num-iter)
[![minimum rustc 1.31](https://img.shields.io/badge/rustc-1.31+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
[![build status](https://github.com/rust-num/num-iter/workflows/master/badge.svg)](https://github.com/rust-num/num-iter/actions)
Generic `Range` iterators for Rust.
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
num-iter = "0.1"
```
## Features
This crate can be used without the standard library (`#![no_std]`) by disabling
the default `std` feature. Use this in `Cargo.toml`:
```toml
[dependencies.num-iter]
version = "0.1.35"
default-features = false
```
There is no functional difference with and without `std` at this time, but
there may be in the future.
## Releases
Release notes are available in [RELEASES.md](RELEASES.md).
## Compatibility
The `num-iter` crate is tested for rustc 1.31 and greater.
## License
Licensed under either of
* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

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# Release 0.1.45 (2024-05-03)
- [Use `Integer::dec` in `DoubleEndedIterator`][29]
**Contributors**: @cuviper
[29]: https://github.com/rust-num/num-iter/pull/29
# Release 0.1.44 (2024-02-07)
- [Upgrade to 2018 edition, **MSRV 1.31**][22]
**Contributors**: @cuviper
[22]: https://github.com/rust-num/num-iter/pull/22
# Release 0.1.43 (2022-04-26)
- [`Range`, `RangeInclusive`, and `RangeFrom` now implement `RangeBounds`][21]
from Rust 1.28 and later.
**Contributors**: @chrismit3s, @cuviper
[21]: https://github.com/rust-num/num-iter/pull/21
# Release 0.1.42 (2020-10-29)
- [The "i128" feature now bypasses compiler probing][20]. The build script
used to probe anyway and panic if requested support wasn't found, but
sometimes this ran into bad corner cases with `autocfg`.
**Contributors**: @cuviper
[20]: https://github.com/rust-num/num-iter/pull/20
# Release 0.1.41 (2020-06-11)
- [The new `RangeFrom` and `RangeFromStep` iterators][18] will count from a
given starting value, without any terminating value.
**Contributors**: @cuviper, @sollyucko
[18]: https://github.com/rust-num/num-iter/pull/18
# Release 0.1.40 (2020-01-09)
- [Updated the `autocfg` build dependency to 1.0][14].
**Contributors**: @cuviper, @dingelish
[14]: https://github.com/rust-num/num-iter/pull/14
# Release 0.1.39 (2019-05-21)
- [Fixed feature detection on `no_std` targets][11].
**Contributors**: @cuviper
[11]: https://github.com/rust-num/num-iter/pull/11
# Release 0.1.38 (2019-05-20)
- Maintenance update -- no functional changes.
**Contributors**: @cuviper, @ignatenkobrain
# Release 0.1.37 (2018-05-11)
- [Support for 128-bit integers is now automatically detected and enabled.][5]
Setting the `i128` crate feature now causes the build script to panic if such
support is not detected.
**Contributors**: @cuviper
[5]: https://github.com/rust-num/num-iter/pull/5
# Release 0.1.36 (2018-05-10)
- [The iterators are now implemented for `i128` and `u128`][7] starting with
Rust 1.26, enabled by the new `i128` crate feature.
**Contributors**: @cuviper
[4]: https://github.com/rust-num/num-iter/pull/4
# Release 0.1.35 (2018-02-06)
- [num-iter now has its own source repository][num-356] at [rust-num/num-iter][home].
- [There is now a `std` feature][2], enabled by default, along with the implication
that building *without* this feature makes this a `#[no_std]` crate.
- There is no difference in the API at this time.
**Contributors**: @cuviper
[home]: https://github.com/rust-num/num-iter
[num-356]: https://github.com/rust-num/num/pull/356
[2]: https://github.com/rust-num/num-iter/pull/2
# Prior releases
No prior release notes were kept. Thanks all the same to the many
contributors that have made this crate what it is!

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// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! External iterators for generic mathematics
//!
//! ## Compatibility
//!
//! The `num-iter` crate is tested for rustc 1.31 and greater.
#![doc(html_root_url = "https://docs.rs/num-iter/0.1")]
#![no_std]
use core::ops::{Add, Bound, RangeBounds, Sub};
use core::usize;
use num_integer::Integer;
use num_traits::{CheckedAdd, One, ToPrimitive, Zero};
/// An iterator over the range [start, stop)
#[derive(Clone)]
pub struct Range<A> {
state: A,
stop: A,
one: A,
}
/// Returns an iterator over the given range [start, stop) (that is, starting
/// at start (inclusive), and ending at stop (exclusive)).
///
/// # Example
///
/// ```rust
/// let array = [0, 1, 2, 3, 4];
///
/// for i in num_iter::range(0, 5) {
/// println!("{}", i);
/// assert_eq!(i, array[i]);
/// }
/// ```
#[inline]
pub fn range<A>(start: A, stop: A) -> Range<A>
where
A: Add<A, Output = A> + PartialOrd + Clone + One,
{
Range {
state: start,
stop,
one: One::one(),
}
}
#[inline]
fn unsigned<T: ToPrimitive>(x: &T) -> Option<u128> {
match x.to_u128() {
Some(u) => Some(u),
None => Some(x.to_i128()? as u128),
}
}
impl<A> RangeBounds<A> for Range<A> {
fn start_bound(&self) -> Bound<&A> {
Bound::Included(&self.state)
}
fn end_bound(&self) -> Bound<&A> {
Bound::Excluded(&self.stop)
}
}
// FIXME: rust-lang/rust#10414: Unfortunate type bound
impl<A> Iterator for Range<A>
where
A: Add<A, Output = A> + PartialOrd + Clone + ToPrimitive,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
if self.state < self.stop {
let result = self.state.clone();
self.state = self.state.clone() + self.one.clone();
Some(result)
} else {
None
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
// Check for empty ranges first.
if self.state >= self.stop {
return (0, Some(0));
}
// Try to cast both ends to the largest unsigned primitive.
// Note that negative values will wrap to a large positive.
if let Some(a) = unsigned(&self.state) {
if let Some(b) = unsigned(&self.stop) {
// We've lost signs, but we already know state < stop, so
// a `wrapping_sub` will give the correct unsigned delta.
return match b.wrapping_sub(a).to_usize() {
Some(len) => (len, Some(len)),
None => (usize::MAX, None),
};
}
}
// Standard fallback for unbounded/unrepresentable bounds
(0, None)
}
}
/// `Integer` is required to ensure the range will be the same regardless of
/// the direction it is consumed.
impl<A> DoubleEndedIterator for Range<A>
where
A: Integer + Clone + ToPrimitive,
{
#[inline]
fn next_back(&mut self) -> Option<A> {
if self.stop > self.state {
self.stop.dec();
Some(self.stop.clone())
} else {
None
}
}
}
/// An iterator over the range [start, stop]
#[derive(Clone)]
pub struct RangeInclusive<A> {
range: Range<A>,
done: bool,
}
/// Return an iterator over the range [start, stop]
#[inline]
pub fn range_inclusive<A>(start: A, stop: A) -> RangeInclusive<A>
where
A: Add<A, Output = A> + PartialOrd + Clone + One,
{
RangeInclusive {
range: range(start, stop),
done: false,
}
}
impl<A> RangeBounds<A> for RangeInclusive<A> {
fn start_bound(&self) -> Bound<&A> {
Bound::Included(&self.range.state)
}
fn end_bound(&self) -> Bound<&A> {
Bound::Included(&self.range.stop)
}
}
impl<A> Iterator for RangeInclusive<A>
where
A: Add<A, Output = A> + PartialOrd + Clone + ToPrimitive,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
match self.range.next() {
Some(x) => Some(x),
None => {
if !self.done && self.range.state == self.range.stop {
self.done = true;
Some(self.range.stop.clone())
} else {
None
}
}
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let (lo, hi) = self.range.size_hint();
if self.done {
(lo, hi)
} else {
let lo = lo.saturating_add(1);
let hi = match hi {
Some(x) => x.checked_add(1),
None => None,
};
(lo, hi)
}
}
}
impl<A> DoubleEndedIterator for RangeInclusive<A>
where
A: Sub<A, Output = A> + Integer + Clone + ToPrimitive,
{
#[inline]
fn next_back(&mut self) -> Option<A> {
if self.range.stop > self.range.state {
let result = self.range.stop.clone();
self.range.stop.dec();
Some(result)
} else if !self.done && self.range.state == self.range.stop {
self.done = true;
Some(self.range.stop.clone())
} else {
None
}
}
}
/// An iterator over the range [start, stop) by `step`. It handles overflow by stopping.
#[derive(Clone)]
pub struct RangeStep<A> {
state: A,
stop: A,
step: A,
rev: bool,
}
/// Return an iterator over the range [start, stop) by `step`. It handles overflow by stopping.
#[inline]
pub fn range_step<A>(start: A, stop: A, step: A) -> RangeStep<A>
where
A: CheckedAdd + PartialOrd + Clone + Zero,
{
let rev = step < Zero::zero();
RangeStep {
state: start,
stop,
step,
rev,
}
}
impl<A> Iterator for RangeStep<A>
where
A: CheckedAdd + PartialOrd + Clone,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
if (self.rev && self.state > self.stop) || (!self.rev && self.state < self.stop) {
let result = self.state.clone();
match self.state.checked_add(&self.step) {
Some(x) => self.state = x,
None => self.state = self.stop.clone(),
}
Some(result)
} else {
None
}
}
}
/// An iterator over the range [start, stop] by `step`. It handles overflow by stopping.
#[derive(Clone)]
pub struct RangeStepInclusive<A> {
state: A,
stop: A,
step: A,
rev: bool,
done: bool,
}
/// Return an iterator over the range [start, stop] by `step`. It handles overflow by stopping.
#[inline]
pub fn range_step_inclusive<A>(start: A, stop: A, step: A) -> RangeStepInclusive<A>
where
A: CheckedAdd + PartialOrd + Clone + Zero,
{
let rev = step < Zero::zero();
RangeStepInclusive {
state: start,
stop,
step,
rev,
done: false,
}
}
impl<A> Iterator for RangeStepInclusive<A>
where
A: CheckedAdd + PartialOrd + Clone + PartialEq,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
if !self.done
&& ((self.rev && self.state >= self.stop) || (!self.rev && self.state <= self.stop))
{
let result = self.state.clone();
match self.state.checked_add(&self.step) {
Some(x) => self.state = x,
None => self.done = true,
}
Some(result)
} else {
None
}
}
}
/// An iterator over the infinite range starting at `start`
#[derive(Clone)]
pub struct RangeFrom<A> {
state: A,
one: A,
}
/// Return an iterator over the infinite range starting at `start` and continuing forever.
///
/// *Note*: Currently, the `Iterator` implementation is not checked for overflow.
/// If you use a finite-sized integer type and the integer overflows,
/// it might panic in debug mode or wrap around in release mode.
/// **This behavior is not guaranteed and may change at any time.**
#[inline]
pub fn range_from<A>(start: A) -> RangeFrom<A>
where
A: Add<A, Output = A> + Clone + One,
{
RangeFrom {
state: start,
one: One::one(),
}
}
impl<A> RangeBounds<A> for RangeFrom<A> {
fn start_bound(&self) -> Bound<&A> {
Bound::Included(&self.state)
}
fn end_bound(&self) -> Bound<&A> {
Bound::Unbounded
}
}
impl<A> Iterator for RangeFrom<A>
where
A: Add<A, Output = A> + Clone,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
let result = self.state.clone();
self.state = self.state.clone() + self.one.clone();
Some(result)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(usize::MAX, None)
}
}
/// An iterator over the infinite range starting at `start` by `step`
#[derive(Clone)]
pub struct RangeStepFrom<A> {
state: A,
step: A,
}
/// Return an iterator over the infinite range starting at `start` and continuing forever by `step`.
///
/// *Note*: Currently, the `Iterator` implementation is not checked for overflow.
/// If you use a finite-sized integer type and the integer overflows,
/// it might panic in debug mode or wrap around in release mode.
/// **This behavior is not guaranteed and may change at any time.**
#[inline]
pub fn range_step_from<A>(start: A, step: A) -> RangeStepFrom<A>
where
A: Add<A, Output = A> + Clone,
{
RangeStepFrom { state: start, step }
}
impl<A> Iterator for RangeStepFrom<A>
where
A: Add<A, Output = A> + Clone,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
let result = self.state.clone();
self.state = self.state.clone() + self.step.clone();
Some(result)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(usize::MAX, None)
}
}
#[cfg(test)]
mod tests {
use core::cmp::Ordering;
use core::iter;
use core::ops::{Add, Mul};
use core::{isize, usize};
use num_traits::{One, ToPrimitive};
#[test]
fn test_range() {
/// A mock type to check Range when ToPrimitive returns None
struct Foo;
impl ToPrimitive for Foo {
fn to_i64(&self) -> Option<i64> {
None
}
fn to_u64(&self) -> Option<u64> {
None
}
}
impl Add<Foo> for Foo {
type Output = Foo;
fn add(self, _: Foo) -> Foo {
Foo
}
}
impl PartialEq for Foo {
fn eq(&self, _: &Foo) -> bool {
true
}
}
impl PartialOrd for Foo {
fn partial_cmp(&self, _: &Foo) -> Option<Ordering> {
None
}
}
impl Clone for Foo {
fn clone(&self) -> Foo {
Foo
}
}
impl Mul<Foo> for Foo {
type Output = Foo;
fn mul(self, _: Foo) -> Foo {
Foo
}
}
impl One for Foo {
fn one() -> Foo {
Foo
}
}
assert!(super::range(0, 5).eq([0, 1, 2, 3, 4].iter().cloned()));
assert!(super::range(-10, -1).eq([-10, -9, -8, -7, -6, -5, -4, -3, -2].iter().cloned()));
assert!(super::range(0, 5).rev().eq([4, 3, 2, 1, 0].iter().cloned()));
assert_eq!(super::range(200, -5).count(), 0);
assert_eq!(super::range(200, -5).rev().count(), 0);
assert_eq!(super::range(200, 200).count(), 0);
assert_eq!(super::range(200, 200).rev().count(), 0);
assert_eq!(super::range(0, 100).size_hint(), (100, Some(100)));
// this test is only meaningful when sizeof usize < sizeof u64
assert_eq!(
super::range(usize::MAX - 1, usize::MAX).size_hint(),
(1, Some(1))
);
assert_eq!(super::range(-10, -1).size_hint(), (9, Some(9)));
assert_eq!(
super::range(isize::MIN, isize::MAX).size_hint(),
(usize::MAX, Some(usize::MAX))
);
}
#[test]
fn test_range_128() {
use core::{i128, u128};
assert!(super::range(0i128, 5).eq([0, 1, 2, 3, 4].iter().cloned()));
assert!(super::range(-10i128, -1).eq([-10, -9, -8, -7, -6, -5, -4, -3, -2].iter().cloned()));
assert!(super::range(0u128, 5)
.rev()
.eq([4, 3, 2, 1, 0].iter().cloned()));
assert_eq!(
super::range(i128::MIN, i128::MIN + 1).size_hint(),
(1, Some(1))
);
assert_eq!(
super::range(i128::MAX - 1, i128::MAX).size_hint(),
(1, Some(1))
);
assert_eq!(
super::range(i128::MIN, i128::MAX).size_hint(),
(usize::MAX, None)
);
assert_eq!(
super::range(u128::MAX - 1, u128::MAX).size_hint(),
(1, Some(1))
);
assert_eq!(
super::range(0, usize::MAX as u128).size_hint(),
(usize::MAX, Some(usize::MAX))
);
assert_eq!(
super::range(0, usize::MAX as u128 + 1).size_hint(),
(usize::MAX, None)
);
assert_eq!(super::range(0, i128::MAX).size_hint(), (usize::MAX, None));
}
#[test]
fn test_range_inclusive() {
assert!(super::range_inclusive(0, 5).eq([0, 1, 2, 3, 4, 5].iter().cloned()));
assert!(super::range_inclusive(0, 5)
.rev()
.eq([5, 4, 3, 2, 1, 0].iter().cloned()));
assert_eq!(super::range_inclusive(200, -5).count(), 0);
assert_eq!(super::range_inclusive(200, -5).rev().count(), 0);
assert!(super::range_inclusive(200, 200).eq(iter::once(200)));
assert!(super::range_inclusive(200, 200).rev().eq(iter::once(200)));
assert_eq!(
super::range_inclusive(isize::MIN, isize::MAX - 1).size_hint(),
(usize::MAX, Some(usize::MAX))
);
assert_eq!(
super::range_inclusive(isize::MIN, isize::MAX).size_hint(),
(usize::MAX, None)
);
}
#[test]
fn test_range_inclusive_128() {
use core::i128;
assert!(super::range_inclusive(0u128, 5).eq([0, 1, 2, 3, 4, 5].iter().cloned()));
assert!(super::range_inclusive(0u128, 5)
.rev()
.eq([5, 4, 3, 2, 1, 0].iter().cloned()));
assert_eq!(super::range_inclusive(200i128, -5).count(), 0);
assert_eq!(super::range_inclusive(200i128, -5).rev().count(), 0);
assert!(super::range_inclusive(200u128, 200).eq(iter::once(200)));
assert!(super::range_inclusive(200u128, 200)
.rev()
.eq(iter::once(200)));
assert_eq!(
super::range_inclusive(isize::MIN as i128, isize::MAX as i128 - 1).size_hint(),
(usize::MAX, Some(usize::MAX))
);
assert_eq!(
super::range_inclusive(isize::MIN as i128, isize::MAX as i128).size_hint(),
(usize::MAX, None)
);
assert_eq!(
super::range_inclusive(isize::MIN as i128, isize::MAX as i128 + 1).size_hint(),
(usize::MAX, None)
);
assert_eq!(
super::range_inclusive(i128::MIN, i128::MAX).size_hint(),
(usize::MAX, None)
);
}
#[test]
fn test_range_step() {
assert!(super::range_step(0, 20, 5).eq([0, 5, 10, 15].iter().cloned()));
assert!(super::range_step(20, 0, -5).eq([20, 15, 10, 5].iter().cloned()));
assert!(super::range_step(20, 0, -6).eq([20, 14, 8, 2].iter().cloned()));
assert!(super::range_step(200u8, 255, 50).eq([200u8, 250].iter().cloned()));
assert!(super::range_step(200, -5, 1).eq(iter::empty()));
assert!(super::range_step(200, 200, 1).eq(iter::empty()));
}
#[test]
fn test_range_step_128() {
use core::u128::MAX as UMAX;
assert!(super::range_step(0u128, 20, 5).eq([0, 5, 10, 15].iter().cloned()));
assert!(super::range_step(20i128, 0, -5).eq([20, 15, 10, 5].iter().cloned()));
assert!(super::range_step(20i128, 0, -6).eq([20, 14, 8, 2].iter().cloned()));
assert!(super::range_step(UMAX - 55, UMAX, 50).eq([UMAX - 55, UMAX - 5].iter().cloned()));
assert!(super::range_step(200i128, -5, 1).eq(iter::empty()));
assert!(super::range_step(200i128, 200, 1).eq(iter::empty()));
}
#[test]
fn test_range_step_inclusive() {
assert!(super::range_step_inclusive(0, 20, 5).eq([0, 5, 10, 15, 20].iter().cloned()));
assert!(super::range_step_inclusive(20, 0, -5).eq([20, 15, 10, 5, 0].iter().cloned()));
assert!(super::range_step_inclusive(20, 0, -6).eq([20, 14, 8, 2].iter().cloned()));
assert!(super::range_step_inclusive(200u8, 255, 50).eq([200u8, 250].iter().cloned()));
assert!(super::range_step_inclusive(200, -5, 1).eq(iter::empty()));
assert!(super::range_step_inclusive(200, 200, 1).eq(iter::once(200)));
}
#[test]
fn test_range_step_inclusive_128() {
use core::u128::MAX as UMAX;
assert!(super::range_step_inclusive(0u128, 20, 5).eq([0, 5, 10, 15, 20].iter().cloned()));
assert!(super::range_step_inclusive(20i128, 0, -5).eq([20, 15, 10, 5, 0].iter().cloned()));
assert!(super::range_step_inclusive(20i128, 0, -6).eq([20, 14, 8, 2].iter().cloned()));
assert!(super::range_step_inclusive(UMAX - 55, UMAX, 50)
.eq([UMAX - 55, UMAX - 5].iter().cloned()));
assert!(super::range_step_inclusive(200i128, -5, 1).eq(iter::empty()));
assert!(super::range_step_inclusive(200i128, 200, 1).eq(iter::once(200)));
}
#[test]
fn test_range_from() {
assert!(super::range_from(10u8)
.take(5)
.eq([10, 11, 12, 13, 14].iter().cloned()));
assert_eq!(super::range_from(10u8).size_hint(), (usize::MAX, None));
}
#[test]
fn test_range_step_from() {
assert!(super::range_step_from(10u8, 2u8)
.take(5)
.eq([10, 12, 14, 16, 18].iter().cloned()));
assert_eq!(
super::range_step_from(10u8, 2u8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10u8, 1u8)
.take(5)
.eq([10, 11, 12, 13, 14].iter().cloned()));
assert_eq!(
super::range_step_from(10u8, 1u8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10u8, 0u8)
.take(5)
.eq([10, 10, 10, 10, 10].iter().cloned()));
assert_eq!(
super::range_step_from(10u8, 0u8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10i8, 2i8)
.take(5)
.eq([10, 12, 14, 16, 18].iter().cloned()));
assert_eq!(
super::range_step_from(10i8, 2i8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10i8, 1i8)
.take(5)
.eq([10, 11, 12, 13, 14].iter().cloned()));
assert_eq!(
super::range_step_from(10i8, 1i8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10i8, 0i8)
.take(5)
.eq([10, 10, 10, 10, 10].iter().cloned()));
assert_eq!(
super::range_step_from(10i8, 0i8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10i8, -1i8)
.take(5)
.eq([10, 9, 8, 7, 6].iter().cloned()));
assert_eq!(
super::range_step_from(10i8, -1i8).size_hint(),
(usize::MAX, None)
);
assert!(super::range_step_from(10i8, -2i8)
.take(5)
.eq([10, 8, 6, 4, 2].iter().cloned()));
assert_eq!(
super::range_step_from(10i8, -2i8).size_hint(),
(usize::MAX, None)
);
}
}

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