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Auto merge of #133321 - compiler-errors:const-checker, r=wesleywiser

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Get rid of HIR const checker

As far as I can tell, the HIR const checker was implemented in https://github.com/rust-lang/rust/pull/66170 because we were not able to issue useful const error messages in the MIR const checker.

This seems to have changed in the last 5 years, probably due to work like #90532. I've tweaked the diagnostics slightly and think the error messages have gotten *better* in fact.

Thus I think the HIR const checker has reached the end of its usefulness, and we can retire it.

cc `@RalfJung`
This commit is contained in:
bors 2024-12-03 04:39:48 +00:00
commit efdd9e8020
38 changed files with 151 additions and 604 deletions
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11
compiler/rustc_const_eval/src/check_consts/ops.rs
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@ -180,8 +180,10 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
};
}
let mut err = match kind {
CallDesugaringKind::ForLoopIntoIter => {
// Don't point at the trait if this is a desugaring...
// FIXME(const_trait_impl): we could perhaps do this for `Iterator`.
match kind {
CallDesugaringKind::ForLoopIntoIter | CallDesugaringKind::ForLoopNext => {
error!(NonConstForLoopIntoIter)
}
CallDesugaringKind::QuestionBranch => {
@ -196,10 +198,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
CallDesugaringKind::Await => {
error!(NonConstAwait)
}
};
diag_trait(&mut err, self_ty, kind.trait_def_id(tcx));
err
}
}
CallKind::FnCall { fn_trait_id, self_ty } => {
let note = match self_ty.kind() {