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Rollup merge of #131981 - compiler-errors:bound-constness, r=cjgillot

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Remove the `BoundConstness::NotConst` variant

I find it easier to represent `BoundConstness::NotConst` as just `None` for some refactorings I'm doing.
This commit is contained in:
Matthias Krüger 2024-10-21 07:01:37 +02:00 • committed by GitHub
commit 62b7293a90
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7 changed files with 46 additions and 41 deletions
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27
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
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@ -290,7 +290,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
}
if tcx.is_lang_item(leaf_trait_ref.def_id(), LangItem::Drop)
&& matches!(predicate_constness, ty::BoundConstness::ConstIfConst | ty::BoundConstness::Const)
&& matches!(predicate_constness, Some(ty::BoundConstness::ConstIfConst | ty::BoundConstness::Const))
{
err.note("`~const Drop` was renamed to `~const Destruct`");
err.note("See <https://github.com/rust-lang/rust/pull/94901> for more details");
@ -2192,7 +2192,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
&self,
trait_predicate: ty::PolyTraitPredicate<'tcx>,
message: Option<String>,
predicate_constness: ty::BoundConstness,
predicate_constness: Option<ty::BoundConstness>,
append_const_msg: Option<AppendConstMessage>,
post_message: String,
) -> String {
@ -2200,19 +2200,21 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
.and_then(|cannot_do_this| {
match (predicate_constness, append_const_msg) {
// do nothing if predicate is not const
(ty::BoundConstness::NotConst, _) => Some(cannot_do_this),
(None, _) => Some(cannot_do_this),
// suggested using default post message
(
ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst,
Some(ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst),
Some(AppendConstMessage::Default),
) => Some(format!("{cannot_do_this} in const contexts")),
// overridden post message
(
ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst,
Some(ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst),
Some(AppendConstMessage::Custom(custom_msg, _)),
) => Some(format!("{cannot_do_this}{custom_msg}")),
// fallback to generic message
(ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst, None) => None,
(Some(ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst), None) => {
None
}
}
})
.unwrap_or_else(|| {
@ -2358,26 +2360,27 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
p: ty::PolyTraitPredicate<'tcx>,
leaf: ty::PolyTraitPredicate<'tcx>,
span: Span,
) -> (ty::PolyTraitPredicate<'tcx>, ty::PolyTraitPredicate<'tcx>, ty::BoundConstness) {
) -> (ty::PolyTraitPredicate<'tcx>, ty::PolyTraitPredicate<'tcx>, Option<ty::BoundConstness>)
{
let trait_ref = p.to_poly_trait_ref();
if !self.tcx.is_lang_item(trait_ref.def_id(), LangItem::EffectsCompat) {
return (p, leaf, ty::BoundConstness::NotConst);
return (p, leaf, None);
}
let Some(ty::Alias(ty::AliasTyKind::Projection, projection)) =
trait_ref.self_ty().no_bound_vars().map(Ty::kind)
else {
return (p, leaf, ty::BoundConstness::NotConst);
return (p, leaf, None);
};
let constness = trait_ref.skip_binder().args.const_at(1);
let constness = if constness == self.tcx.consts.true_ || constness.is_ct_infer() {
ty::BoundConstness::NotConst
None
} else if constness == self.tcx.consts.false_ {
ty::BoundConstness::Const
Some(ty::BoundConstness::Const)
} else if matches!(constness.kind(), ty::ConstKind::Param(_)) {
ty::BoundConstness::ConstIfConst
Some(ty::BoundConstness::ConstIfConst)
} else {
self.dcx().span_bug(span, format!("Unknown constness argument: {constness:?}"));
};