bors 36a74944cb Auto merge of #77526 - RalfJung:dont-promote-unions, r=lcnr ... stop promoting union field accesses in 'const' Turns out that promotion of union field accesses is the only difference between "promotion in `const`/`static` bodies" and "explicit promotion". So if we can remove this, we have finally achieved what I thought to already be the case -- that the bodies of `const`/`static` initializers behave the same as explicit promotion contexts. The reason we do not want to promote union field accesses is that they can introduce UB, i.e., they can go wrong. We want to [minimize the ways promoteds can fail to evaluate](https://github.com/rust-lang/const-eval/issues/53). Also this change makes things more consistent overall, removing a special case that was added without much consideration (as far as I can tell). Cc `@rust-lang/wg-const-eval`		2020-10-25 02:27:09 +00:00
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src	Auto merge of #77526 - RalfJung:dont-promote-unions, r=lcnr	2020-10-25 02:27:09 +00:00
Cargo.toml	Use tracing spans to trace the entire MIR interp stack	2020-09-28 20:07:57 +02:00