Tracking Issue for `case_ignorable`

[Jules-Bertholet]

Feature gate: #![feature(case_ignorable)]

This is a tracking issue for a method to query the Unicode Case_Ignorable property on char. This narrow-use property is used to implement lowercasing behavior for word-final Greek sigma (e.g. in str::to_lowercase()).

Public API

// core

impl char {
    pub fn is_case_ignorable(self) -> bool;
}

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• Implementation: Don't include ASCII characters in Unicode tables #146173 Promote char::is_case_ignorable from perma-unstable to unstable #154849
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

@rustbot label -S-tracking-unimplemented S-tracking-needs-to-bake

Footnotes

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