bors 0978a9eb99 Auto merge of #83207 - oli-obk:valtree2, r=lcnr ... normalize mir::Constant differently from ty::Const in preparation for valtrees Valtrees are unable to represent many kind of constant values (this is on purpose). For constants that are used at runtime, we do not need a valtree representation and can thus use a different form of evaluation. In order to make this explicit and less fragile, I added a `fold_constant` method to `TypeFolder` and implemented it for normalization. Normalization can now, when it wants to eagerly evaluate a constant, normalize `mir::Constant` directly into a `mir::ConstantKind::Val` instead of relying on the `ty::Const` evaluation. In the future we can get rid of the `ty::Const` in there entirely and add our own `Unevaluated` variant to `mir::ConstantKind`. This would allow us to remove the `promoted` field from `ty::ConstKind::Unevaluated`, as promoteds can never occur in the type system. cc `@rust-lang/wg-const-eval` r? `@lcnr`		2021-04-02 10:28:12 +00:00
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src	Auto merge of #83207 - oli-obk:valtree2, r=lcnr	2021-04-02 10:28:12 +00:00
Cargo.toml	bumped smallvec deps	2021-02-14 18:03:11 +03:00