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Rollup merge of rust-lang#80394 - RalfJung:const-err-future, r=oli-obk
make const_err a future incompat lint This is the first step for rust-lang#71800: make const_err a future-incompat lint. I also rewrote the const_err lint description as the old one seemed wrong. This has the unfortunate side-effect of making const-eval error even more verbose by making the const_err message longer without fixing the redundancy caused by additionally emitting an error on each use site of the constant. We cannot fix that redundancy until const_err is a *hard* error (at that point the error-on-use-site can be turned into a `delay_span_bug!` for uses of monomorphic consts, and into a nicely rendered error for [lazily / post-monomorhization evaluated] associated consts). ~~The one annoying effect of this PR is that `let _x = &(1/(1-1));` now also shows the future-incompat warning, even though of course we will *not* make this a hard error. We'll instead (hopefully) stop promoting it -- see rust-lang/rfcs#3027. The only way I see to avoid the future-incompat warning is to use a different lint for "failure to evaluate promoted".~~ Cc `@rust-lang/wg-const-eval`
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