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`		2020-10-07 19:59:52 +00:00
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src	Auto merge of #77464 - ecstatic-morse:const-fn-impl-trait, r=oli-obk	2020-10-07 19:59:52 +00:00
Cargo.toml	Use tracing spans to trace the entire MIR interp stack	2020-09-28 20:07:57 +02:00