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Showing content from https://github.com/rust-lang/rust/issues/110998 below:

Tracking Issue for `ascii::Char` (ACP 179) · Issue #110998 · rust-lang/rust · GitHub

Feature gate: #![feature(ascii_char)] #![feature(ascii_char_variants)]

This is a tracking issue for the ascii::Char type from rust-lang/libs-team#179

https://doc.rust-lang.org/nightly/std/ascii/enum.Char.html

// core::ascii

#[repr(u8)]
enum Char {
    Null = 0,
    …
    Tilde = 127,
}

impl Debug for Char { … }
impl Display for Char { … }
impl Default for Char { ... }

impl Step for Char { ... } // so `Range<Char>` is an Iterator

impl Char {
    const fn from_u8(x: u8) -> Option<Self>;
    const unsafe fn from_u8_unchecked(x: u8) -> Self;
    const fn digit(d: u8) -> Option<Self>;
    const unsafe fn digit_unchecked(d: u8) -> Self;
    const fn as_u8(self) -> u8;
    const fn as_char(self) -> char;
    const fn as_str(&self) -> &str;
}

impl [Char] {
    const fn as_str(&self) -> &str;
    const fn as_bytes(&self) -> &[u8];
}

impl From<Char> for u8 { … }
impl From<Char> for char { … }
impl From<&[Char]> for &str { … }

// core::array

impl<const N: usize> [u8; N] {
    const fn as_ascii(&self) -> Option<&[ascii::Char; N]>;
    const unsafe fn as_ascii_unchecked(&self) -> &[ascii::Char; N];
}

// core::char

impl char {
    const fn as_ascii(&self) -> Option<ascii::Char>;
}

// core::num

impl u8 {
    const fn as_ascii(&self) -> Option<ascii::Char>;
}

// core::slice

impl [u8] {
    const fn as_ascii(&self) -> Option<&[ascii::Char]>;
    const unsafe fn as_ascii_unchecked(&self) -> &[ascii::Char];
}

// core::str

impl str {
    const fn as_ascii(&self) -> Option<&[ascii::Char]>;
}

• Implementation:
  • Add ascii::Char (ACP#179) #111009
  • Constify [u8]::is_ascii (unstably) #111222
  • Rename copying ascii::Char methods from as_ to to_ #114641
  • implement Default for AsciiChar #121024
  • Implement Extend<AsciiChar> for String #136749
• Final comment period (FCP)¹
• Stabilization PR

• What should it be named? Code mixing char and Char might be too confusing.
• How should its Debug impl work?
  • make Debug impl for ascii::Char match that of char #115434
• Is allowing as-casting from it a good or bad feature?
  • FWIW, there's no char::to_u32, just as u32 for it.
• Some of the as_ascii methods take &self for consistency with is_ascii. Should they take self instead where possible, as the usually-better option, or stick with &self for the consistency?

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

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