Auto merge of #157094 - khyperia:UnevaluatedConstKind, r=BoxyUwU introduce UnevaluatedConstKind (no rush on this, boxy, if you get this notif, I know you're on break after rustweek) Partially fixes https://github.com/rust-lang/project-const-generics/issues/98 - does not unify GCE `ConstKind::Expr` into Unevaluated, which is part of that issue - does not do more advanced refactoring to take advantage of the new kind repr, only refactoring when things are very obviously able to take advantage - does not change MIR's UnevaluatedConst to use UnevaluatedConstKind, as there's currently no benefit, and doing so instead overcomplicates many places. Possibly could be done in a followup, or I can do it here if desired. - more advanced potentially behavior-changing changes can be done in a followup, as this diff is big enough as it is, IMO. same with merging GCE Exprs into Unevaluated. - (... but if this takes a while to get reviewed, I might plop some more stuff into this PR) - I think it would be cute to rename UnevaluatedConst to AliasConst or something, to better reflect the parallels to AliasTy, but shrug, haha r? @BoxyUwU
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