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Clarify ASCII whitespace docs in u8::is_ascii_whitespace #155012

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Clarify ASCII whitespace docs in u8::is_ascii_whitespace #155012

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5 changes: 5 additions & 0 deletions library/core/src/num/mod.rs
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Expand Up @@ -1073,6 +1073,11 @@ impl u8 {
/// "field splitting" in the Bourne shell][bfs] considers *only*
/// SPACE, HORIZONTAL TAB, and LINE FEED as whitespace.
///
/// Note: The Rust language parser uses a different definition of
/// whitespace, which includes U+000B VERTICAL TAB. The Rust standard
/// library (this function) does **not** include vertical tab, following
/// the WhatWG Infra Standard instead.
///
/// If you are writing a program that will process an existing
/// file format, check what that format's definition of whitespace is
/// before using this function.
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