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.