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Part of #68490.
Care has been taken to leave the old consts where appropriate, for testing backcompat regressions, module shadowing, etc. The intrinsics docs were accidentally referring to some methods on f64 as std::f64, which I changed due to being contrary with how we normally disambiguate the shadow module from the primitive. In one other place I changed std::u8 to std::ops since it was just testing path handling in macros.
For places which have legitimate uses of the old consts, deprecated attributes have been optimistically inserted. Although currently unnecessary, they exist to emphasize to any future deprecation effort the necessity of these specific symbols and prevent them from being accidentally removed.
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Miri core engine: use throw_ub instead of throw_panic
See https://github.com/rust-lang/rust/issues/66902 for context: panicking is not really an "interpreter error", but just part of a normal Rust execution. This is a first step towards removing the `InterpError::Panic` variant: the core Miri engine does not use it any more.
ConstProp and ConstEval still use it, though. This will be addressed in future PRs.
From what I can tell, all the error messages this removes are actually duplicates.
r? @oli-obk @wesleywiser
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I believe this occurs because the old checker stopped processing basic
blocks after a `SwitchInt`.
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The MIR const-checker errors for if/match/loop are now delay span bugs,
so nothing will be emitted unless the HIR checker misses something.
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