Tracking Issue for const_ord

[oli-obk]

Feature gate: #![feature(const_ord)]

This is a tracking issue for the PartialOrd and Ord traits' constness, allowing comparison operators other than on primitive types to be used in const contexts.

Public API

const {
    Some(42).cmp(None)
}

Steps / History

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

• Implementation: WIP, needed tracking issue id for impl
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

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

[clarfonthey]

Is there a reason why this is separate from #143800?

[oli-obk]

Not really, but since I personally would just have put all libcore traits under one big feature gate I don't really know where to draw the lines

[clarfonthey]

I guess in that case, since I was going to work on constifying Ord and co. too, I'll use #143800 instead.

[oli-obk]

I already had a branch for it, but it was blocked on the Try trait because of the tuple impl. Merging with the cmp feature gate makes sense tho

[oli-obk]

#143768 should land soon, after that you should be able to constify the tuple impl for Ord, too