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drive-by: use is_const and is_const_if_const

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This commit is contained in:
Michael Goulet
2022-01-26 19:24:01 -08:00
parent 1ab97dbc52
commit c6de4d55aa
7 changed files with 16 additions and 15 deletions
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2
compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
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@@ -305,7 +305,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
} else if lang_items.unsize_trait() == Some(def_id) {
self.assemble_candidates_for_unsizing(obligation, &mut candidates);
} else if lang_items.drop_trait() == Some(def_id)
&& obligation.predicate.skip_binder().constness == ty::BoundConstness::ConstIfConst
&& obligation.predicate.is_const_if_const()
{
self.assemble_const_drop_candidates(obligation, &mut candidates);
} else {

4
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
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@@ -72,9 +72,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
// CheckPredicate(&A: Super)
// CheckPredicate(A: ~const Super) // <- still const env, failure
// ```
if obligation.param_env.constness() == Constness::Const
&& obligation.predicate.skip_binder().constness == ty::BoundConstness::NotConst
{
if obligation.param_env.is_const() && !obligation.predicate.is_const_if_const() {
new_obligation = TraitObligation {
cause: obligation.cause.clone(),
param_env: obligation.param_env.without_const(),

4
compiler/rustc_trait_selection/src/traits/select/mod.rs
View File

@@ -1173,9 +1173,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
ImplCandidate(def_id)
if tcx.impl_constness(def_id) == hir::Constness::Const => {}
// const param
ParamCandidate(trait_pred)
if trait_pred.skip_binder().constness
== ty::BoundConstness::ConstIfConst => {}
ParamCandidate(trait_pred) if trait_pred.is_const_if_const() => {}
// auto trait impl
AutoImplCandidate(..) => {}
// generator, this will raise error in other places