bors 4437b4b150
Auto merge of #77464 - ecstatic-morse:const-fn-impl-trait, r=oli-obk ...
Give `impl Trait` in a `const fn` its own feature gate
...previously it was gated under `#![feature(const_fn)]`.
I think we actually want to do this in all const-contexts? If so, this should be `#![feature(const_impl_trait)]` instead. I don't think there's any way to make use of `impl Trait` within a `const` initializer.
cc #77463
r? `@oli-obk`
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4437b4b150