Tracking Issue for `const_char_classify`

[ultrabear]

Feature gate: #![feature(const_char_is_digit)] #![feature(const_char_classify)]

This is a tracking issue for supporting char::is_digit and char::is_whitespace in const scenarios.

Public API

impl char {
    pub const fn is_digit(self, radix: u32) -> bool;
    pub const fn is_whitespace(self) -> bool;
}

Steps / History

• Implement is_digit: Support char::is_digit in const contexts. #132242
• Implement is_whitespace: make char::is_whitespace unstably const #132500
• Final comment period (FCP)
• Stabilization PR:

Unresolved Questions

• None yet.

[RalfJung]

@rust-lang/libs-api @rust-lang/wg-const-eval these are two fairly small methods that have been stable since 1.0 and that are trivial to const-stabilize, so I think we should go ahead and do that. :)

impl char {
    pub const fn is_digit(self, radix: u32) -> bool;
    pub const fn is_whitespace(self) -> bool;
}

[dtolnay]

@rfcbot fcp merge

[rfcbot]

Team member @dtolnay has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Amanieu
• @BurntSushi
• @dtolnay
• @joshtriplett
• @m-ou-se

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.