Tracking issue for str::split_ascii_whitespace

[clarfonthey]

Implemented in #49987:

impl str {
    pub fn split_ascii_whitespace(&self) -> SplitAsciiWhitespace {…}
}

#[derive(Clone, Debug)]
pub struct SplitAsciiWhitespace<'a> {…}

impl<'a> Iterator for SplitAsciiWhitespace<'a> {
    type Item = &'a str;
    …
}
impl<'a> DoubleEndedIterator for SplitAsciiWhitespace<'a> {…}
impl<'a> FusedIterator for SplitAsciiWhitespace<'a> {}

Original feature request:

---

Considering how is_ascii_whitespace is now available on libcore, it makes sense to provide this too.

I'll provide a PR at some point if this seems reasonable; a lot of code that needs to split on whitespace only needs to split on ASCII whitespace, which is considerably faster.

[SimonSapin]

The implementation PR is in the bors queue, I’ve turned this into a tracking issue.

[clarfonthey]

How do people feel about stabilising this?

[SimonSapin]

Let’s.

@rfcbot fcp merge

[rfcbot]

Team member @SimonSapin has proposed to merge this. The next step is review by the rest of the tagged teams:

• @Kimundi
• @SimonSapin
• @alexcrichton
• @dtolnay
• @sfackler
• @withoutboats

No concerns currently listed.

Once a majority of reviewers approve (and none object), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

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