Tracking Issue for `str::as_str()` & friends

Feature gate: #![feature(str_as_str)]

This is a tracking issue for the as_str() method on the str type itself, so that Box<str>, Rc<str>, Arc<str> & others can have the same things as String has.

Later also expanded to some other types (see below).

Public API

impl str {
    pub const fn as_str(&self) -> &str;
}
impl CStr {
    pub const fn as_c_str(&self) -> &CStr;
}
impl OsStr {
    pub const fn as_os_str(&self) -> &OsStr;
}
impl Path {
    pub const fn as_path(&self) -> &Path;
}
impl [T] {
    pub const fn as_slice(&self) -> &[T];
    pub const fn as_mut_slice(&mut self) -> &mut [T];
}
impl ByteStr {
    pub const fn as_byte_str(&self) -> &ByteStr;
    pub const fn as_mut_byte_str(&mut self) -> &mut ByteStr;
}

• Tracking issue for ByteStr: #134915

Steps / History

• Implementation:
  • for str: #129550
    • t-libs-api's approval: https://github.com/rust-lang/rust/pull/129550#issuecomment-2326941244
  • constify: #145930
  • more types: #145933
    • ACP: https://github.com/rust-lang/libs-team/issues/643
• Final comment period (FCP)^1: https://github.com/rust-lang/rust/pull/151603#issuecomment-3936115026
• Stabilizatoin
  • Stabilization PR: #151603
  • Post-stabilization regression: #152961
  • Revert stabilization: #152963

Unresolved Questions

• None yet.

Start with the public API and Steps / History sections, then read stabilization PR #151603 and the post-stabilization regression and revert issues #152961 and #152963. The work is done when the stabilization outcome is resolved and the remaining checklist accurately reflects it.