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Clarify ASCII whitespace docs in u8::is_ascii_whitespace#155012

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Brace1000 wants to merge 1 commit intorust-lang:mainfrom
Brace1000:fix-ascii-whitespace-docs
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Clarify ASCII whitespace docs in u8::is_ascii_whitespace#155012
Brace1000 wants to merge 1 commit intorust-lang:mainfrom
Brace1000:fix-ascii-whitespace-docs

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Update the docs for u8::is_ascii_whitespace to make it clear
that the standard library uses WhatWG rules for ASCII whitespace,
so vertical tab (U+000B) isn’t included. Also note that the Rust
parser uses a different definition.

Ref: #154765

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 8, 2026
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rustbot commented Apr 8, 2026

r? @Mark-Simulacrum

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The standard library uses the WhatWG Infra Standard definition of ASCII
whitespace, which does not include vertical tab (U+000B). The Rust
language parser uses Unicode Pattern_White_Space, which does include it.
@Brace1000 Brace1000 force-pushed the fix-ascii-whitespace-docs branch from b000558 to ea96c6c Compare April 8, 2026 21:42
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teor2345 commented Apr 8, 2026

@Brace1000 sorry, looks like this is a duplicate of PR #154765

That's my mistake, let's find you another Outreachy task instead?

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4 participants