constify (the unstable) str::as_str

[GrigorenkoPV]

Tracking issue: #130366

The method was not initially marked const presumably because it is only useful with Deref. But now that const traits seem to be a thing that can actually become real, why not make it const?

PR constifying Deref: #145279

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Confused how this could have possibly passed CI without a rustc_const_unstable attribute…

I think they got reworked a few months ago to inherit stability and feature name from the non-const attributes.

Right! Sorry, I was forgetting that this method is still unstable. Carry on, then.

@bors r+ rollup

📌 Commit e06cd9f has been approved by joshtriplett

It is now in the queue for this repository.