Rollup of 4 pull requests

compiler/rustc_hir_analysis/src/bounds.rs

@@ -84,11 +84,11 @@ impl<'tcx> Bounds<'tcx> {
         &mut self,
         tcx: TyCtxt<'tcx>,
         bound_trait_ref: ty::PolyTraitRef<'tcx>,
-        host: ty::HostPolarity,
+        constness: ty::BoundConstness,
         span: Span,
     ) {
         if tcx.is_const_trait(bound_trait_ref.def_id()) {
-            self.clauses.push((bound_trait_ref.to_host_effect_clause(tcx, host), span));
+            self.clauses.push((bound_trait_ref.to_host_effect_clause(tcx, constness), span));
         } else {
             tcx.dcx().span_delayed_bug(span, "tried to lower {host:?} bound for non-const trait");
         }

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -218,7 +218,7 @@ fn compare_method_predicate_entailment<'tcx>(
                     tcx.const_conditions(trait_m.def_id).instantiate_own(tcx, trait_to_impl_args),
                 )
                 .map(|(trait_ref, _)| {
-                    trait_ref.to_host_effect_clause(tcx, ty::HostPolarity::Maybe)
+                    trait_ref.to_host_effect_clause(tcx, ty::BoundConstness::Maybe)
                 }),
         );
     }
@@ -272,7 +272,7 @@ fn compare_method_predicate_entailment<'tcx>(
                 tcx,
                 cause,
                 param_env,
-                const_condition.to_host_effect_clause(tcx, ty::HostPolarity::Maybe),
+                const_condition.to_host_effect_clause(tcx, ty::BoundConstness::Maybe),
             ));
         }
     }
@@ -1942,7 +1942,7 @@ fn compare_type_predicate_entailment<'tcx>(
                     tcx.const_conditions(trait_ty.def_id).instantiate_own(tcx, trait_to_impl_args),
                 )
                 .map(|(trait_ref, _)| {
-                    trait_ref.to_host_effect_clause(tcx, ty::HostPolarity::Maybe)
+                    trait_ref.to_host_effect_clause(tcx, ty::BoundConstness::Maybe)
                 }),
         );
     }
@@ -1985,7 +1985,7 @@ fn compare_type_predicate_entailment<'tcx>(
                 tcx,
                 cause,
                 param_env,
-                const_condition.to_host_effect_clause(tcx, ty::HostPolarity::Maybe),
+                const_condition.to_host_effect_clause(tcx, ty::BoundConstness::Maybe),
             ));
         }
     }
@@ -2091,7 +2091,7 @@ pub(super) fn check_type_bounds<'tcx>(
                         tcx,
                         mk_cause(span),
                         param_env,
-                        c.to_host_effect_clause(tcx, ty::HostPolarity::Maybe),
+                        c.to_host_effect_clause(tcx, ty::BoundConstness::Maybe),
                     )
                 }),
         );

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -1388,7 +1388,7 @@ fn check_impl<'tcx>(
                                 ObligationCauseCode::WellFormed(None),
                             ),
                             wfcx.param_env,
-                            bound.to_host_effect_clause(tcx, ty::HostPolarity::Maybe),
+                            bound.to_host_effect_clause(tcx, ty::BoundConstness::Maybe),
                         ))
                     }
                 }

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -716,7 +716,7 @@ pub(super) fn assert_only_contains_predicates_from<'tcx>(
                 match clause.kind().skip_binder() {
                     ty::ClauseKind::HostEffect(ty::HostEffectPredicate {
                         trait_ref: _,
-                        host: ty::HostPolarity::Maybe,
+                        constness: ty::BoundConstness::Maybe,
                     }) => {}
                     _ => {
                         bug!(
@@ -732,8 +732,8 @@ pub(super) fn assert_only_contains_predicates_from<'tcx>(
                 match clause.kind().skip_binder() {
                     ty::ClauseKind::HostEffect(pred) => {
                         assert_eq!(
-                            pred.host,
-                            ty::HostPolarity::Maybe,
+                            pred.constness,
+                            ty::BoundConstness::Maybe,
                             "expected `~const` predicate when computing `{filter:?}` \
                             implied bounds: {clause:?}",
                         );
@@ -943,7 +943,7 @@ pub(super) fn const_conditions<'tcx>(
         bounds.push_const_bound(
             tcx,
             ty::Binder::dummy(ty::TraitRef::identity(tcx, def_id.to_def_id())),
-            ty::HostPolarity::Maybe,
+            ty::BoundConstness::Maybe,
             DUMMY_SP,
         );
 
@@ -963,7 +963,7 @@ pub(super) fn const_conditions<'tcx>(
                 clause.kind().map_bound(|clause| match clause {
                     ty::ClauseKind::HostEffect(ty::HostEffectPredicate {
                         trait_ref,
-                        host: ty::HostPolarity::Maybe,
+                        constness: ty::BoundConstness::Maybe,
                     }) => trait_ref,
                     _ => bug!("converted {clause:?}"),
                 }),
@@ -1001,7 +1001,7 @@ pub(super) fn implied_const_bounds<'tcx>(
                 clause.kind().map_bound(|clause| match clause {
                     ty::ClauseKind::HostEffect(ty::HostEffectPredicate {
                         trait_ref,
-                        host: ty::HostPolarity::Maybe,
+                        constness: ty::BoundConstness::Maybe,
                     }) => trait_ref,
                     _ => bug!("converted {clause:?}"),
                 }),

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -713,7 +713,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                             bounds.push_const_bound(
                                 tcx,
                                 poly_trait_ref,
-                                ty::HostPolarity::Const,
+                                ty::BoundConstness::Const,
                                 span,
                             );
                         }
@@ -736,7 +736,12 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             PredicateFilter::ConstIfConst | PredicateFilter::SelfConstIfConst => match constness {
                 hir::BoundConstness::Maybe(span) => {
                     if polarity == ty::PredicatePolarity::Positive {
-                        bounds.push_const_bound(tcx, poly_trait_ref, ty::HostPolarity::Maybe, span);
+                        bounds.push_const_bound(
+                            tcx,
+                            poly_trait_ref,
+                            ty::BoundConstness::Maybe,
+                            span,
+                        );
                     }
                 }
                 hir::BoundConstness::Always(_) | hir::BoundConstness::Never => {}

compiler/rustc_hir_typeck/src/callee.rs

@@ -853,9 +853,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let host = match self.tcx.hir().body_const_context(self.body_id) {
             Some(hir::ConstContext::Const { .. } | hir::ConstContext::Static(_)) => {
-                ty::HostPolarity::Const
+                ty::BoundConstness::Const
             }
-            Some(hir::ConstContext::ConstFn) => ty::HostPolarity::Maybe,
+            Some(hir::ConstContext::ConstFn) => ty::BoundConstness::Maybe,
             None => return,
         };
 

compiler/rustc_middle/src/ty/context.rs

@@ -76,8 +76,8 @@ use crate::traits::solve::{
 };
 use crate::ty::predicate::ExistentialPredicateStableCmpExt as _;
 use crate::ty::{
-    self, AdtDef, AdtDefData, AdtKind, Binder, Clause, Clauses, Const, GenericArg, GenericArgs,
-    GenericArgsRef, GenericParamDefKind, HostPolarity, ImplPolarity, List, ListWithCachedTypeInfo,
+    self, AdtDef, AdtDefData, AdtKind, Binder, BoundConstness, Clause, Clauses, Const, GenericArg,
+    GenericArgs, GenericArgsRef, GenericParamDefKind, ImplPolarity, List, ListWithCachedTypeInfo,
     ParamConst, ParamTy, Pattern, PatternKind, PolyExistentialPredicate, PolyFnSig, Predicate,
     PredicateKind, PredicatePolarity, Region, RegionKind, ReprOptions, TraitObjectVisitor, Ty,
     TyKind, TyVid, Visibility,
@@ -2205,7 +2205,7 @@ macro_rules! nop_slice_lift {
 nop_slice_lift! {ty::ValTree<'a> => ty::ValTree<'tcx>}
 
 TrivialLiftImpls! {
-    ImplPolarity, PredicatePolarity, Promoted, HostPolarity,
+    ImplPolarity, PredicatePolarity, Promoted, BoundConstness,
 }
 
 macro_rules! sty_debug_print {

compiler/rustc_middle/src/ty/flags.rs

@@ -267,7 +267,7 @@ impl FlagComputation {
             }
             ty::PredicateKind::Clause(ty::ClauseKind::HostEffect(ty::HostEffectPredicate {
                 trait_ref,
-                host: _,
+                constness: _,
             })) => {
                 self.add_args(trait_ref.args);
             }

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -1959,7 +1959,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
             ty::BoundConstness::Const => {
                 p!("const ");
             }
-            ty::BoundConstness::ConstIfConst => {
+            ty::BoundConstness::Maybe => {
                 p!("~const ");
             }
         }
@@ -3076,9 +3076,9 @@ define_print! {
     }
 
     ty::HostEffectPredicate<'tcx> {
-        let constness = match self.host {
-            ty::HostPolarity::Const => { "const" }
-            ty::HostPolarity::Maybe => { "~const" }
+        let constness = match self.constness {
+            ty::BoundConstness::Const => { "const" }
+            ty::BoundConstness::Maybe => { "~const" }
         };
         p!(print(self.trait_ref.self_ty()), ": {constness} ");
         p!(print(self.trait_ref.print_trait_sugared()))