Tracking Issue for `try_from_int_error_kind`

Feature gate: #![feature(try_from_int_error_kind)]

This is a tracking issue for the kind method on TryFromIntError, and the NotAPowerOfTwo variant on IntErrorKind.

The kind method outputs the detailed cause of converting an integer failing.

The NotAPowerOfTwo variant is required for TryFrom<usize> for Alignment.

Public API

// core::num

impl TryFromIntError {
    pub const fn kind(&self) -> &IntErrorKind;
}

pub enum IntErrorKind {
    ...
    // For `TryFrom<usize> for Alignment`.
    NotAPowerOfTwo,
}

Steps / History

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

• ACP: rust-lang/libs-team#746
• Implementation: #153178
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• Which would be better for the return type: IntErrorKind or &IntErrorKind?

Start with the public API signatures for TryFromIntError::kind and IntErrorKind::NotAPowerOfTwo, then inspect implementation PR #153178. Resolve the listed return-type question and follow the FCP and stabilization checklist; completion is a stabilization PR after those steps.