Cleanup

compiler/rustc_infer/src/traits/util.rs

@@ -9,7 +9,7 @@ pub fn anonymize_predicate<'tcx>(
     tcx: TyCtxt<'tcx>,
     pred: ty::Predicate<'tcx>,
 ) -> ty::Predicate<'tcx> {
-    let new = tcx.anonymize_late_bound_regions(pred.kind());
+    let new = tcx.anonymize_late_bound_regions(pred.bound_atom());
     tcx.reuse_or_mk_predicate(pred, new)
 }
 

compiler/rustc_middle/src/ty/codec.rs

@@ -46,7 +46,7 @@ impl<'tcx, E: TyEncoder<'tcx>> EncodableWithShorthand<'tcx, E> for Ty<'tcx> {
 impl<'tcx, E: TyEncoder<'tcx>> EncodableWithShorthand<'tcx, E> for ty::Predicate<'tcx> {
     type Variant = ty::Binder<ty::PredicateAtom<'tcx>>;
     fn variant(&self) -> &Self::Variant {
-        self.kind_ref()
+        self.bound_atom_ref()
     }
 }
 

compiler/rustc_middle/src/ty/context.rs

@@ -133,13 +133,13 @@ impl<'tcx> CtxtInterners<'tcx> {
     }
 
     #[inline(never)]
-    fn intern_predicate(&self, kind: Binder<PredicateAtom<'tcx>>) -> &'tcx PredicateInner<'tcx> {
+    fn intern_predicate(&self, binder: Binder<PredicateAtom<'tcx>>) -> &'tcx PredicateInner<'tcx> {
         self.predicate
-            .intern(kind, |kind| {
-                let flags = super::flags::FlagComputation::for_predicate(kind);
+            .intern(binder, |binder| {
+                let flags = super::flags::FlagComputation::for_predicate(binder);
 
                 let predicate_struct = PredicateInner {
-                    kind,
+                    binder,
                     flags: flags.flags,
                     outer_exclusive_binder: flags.outer_exclusive_binder,
                 };
@@ -1936,7 +1936,7 @@ impl<'tcx> Borrow<TyKind<'tcx>> for Interned<'tcx, TyS<'tcx>> {
 // N.B., an `Interned<PredicateInner>` compares and hashes as a `PredicateKind`.
 impl<'tcx> PartialEq for Interned<'tcx, PredicateInner<'tcx>> {
     fn eq(&self, other: &Interned<'tcx, PredicateInner<'tcx>>) -> bool {
-        self.0.kind == other.0.kind
+        self.0.binder == other.0.binder
     }
 }
 
@@ -1944,13 +1944,13 @@ impl<'tcx> Eq for Interned<'tcx, PredicateInner<'tcx>> {}
 
 impl<'tcx> Hash for Interned<'tcx, PredicateInner<'tcx>> {
     fn hash<H: Hasher>(&self, s: &mut H) {
-        self.0.kind.hash(s)
+        self.0.binder.hash(s)
     }
 }
 
 impl<'tcx> Borrow<Binder<PredicateAtom<'tcx>>> for Interned<'tcx, PredicateInner<'tcx>> {
     fn borrow<'a>(&'a self) -> &'a Binder<PredicateAtom<'tcx>> {
-        &self.0.kind
+        &self.0.binder
     }
 }
 
@@ -2085,8 +2085,8 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     #[inline]
-    pub fn mk_predicate(self, kind: Binder<PredicateAtom<'tcx>>) -> Predicate<'tcx> {
-        let inner = self.interners.intern_predicate(kind);
+    pub fn mk_predicate(self, binder: Binder<PredicateAtom<'tcx>>) -> Predicate<'tcx> {
+        let inner = self.interners.intern_predicate(binder);
         Predicate { inner }
     }
 
@@ -2094,9 +2094,9 @@ impl<'tcx> TyCtxt<'tcx> {
     pub fn reuse_or_mk_predicate(
         self,
         pred: Predicate<'tcx>,
-        kind: Binder<PredicateAtom<'tcx>>,
+        binder: Binder<PredicateAtom<'tcx>>,
     ) -> Predicate<'tcx> {
-        if pred.kind() != kind { self.mk_predicate(kind) } else { pred }
+        if pred.bound_atom() != binder { self.mk_predicate(binder) } else { pred }
     }
 
     pub fn mk_mach_int(self, tm: ast::IntTy) -> Ty<'tcx> {

compiler/rustc_middle/src/ty/flags.rs

@@ -22,9 +22,9 @@ impl FlagComputation {
         result
     }
 
-    pub fn for_predicate(kind: ty::Binder<ty::PredicateAtom<'_>>) -> FlagComputation {
+    pub fn for_predicate(binder: ty::Binder<ty::PredicateAtom<'_>>) -> FlagComputation {
         let mut result = FlagComputation::new();
-        result.add_predicate_kind(kind);
+        result.add_predicate(binder);
         result
     }
 
@@ -204,7 +204,7 @@ impl FlagComputation {
         }
     }
 
-    fn add_predicate_kind(&mut self, binder: ty::Binder<ty::PredicateAtom<'_>>) {
+    fn add_predicate(&mut self, binder: ty::Binder<ty::PredicateAtom<'_>>) {
         self.bound_computation(binder, |computation, atom| computation.add_predicate_atom(atom));
     }
 

compiler/rustc_middle/src/ty/mod.rs

@@ -1030,7 +1030,7 @@ impl<'tcx> GenericPredicates<'tcx> {
 
 #[derive(Debug)]
 crate struct PredicateInner<'tcx> {
-    kind: Binder<PredicateAtom<'tcx>>,
+    binder: Binder<PredicateAtom<'tcx>>,
     flags: TypeFlags,
     /// See the comment for the corresponding field of [TyS].
     outer_exclusive_binder: ty::DebruijnIndex,
@@ -1060,16 +1060,6 @@ impl Hash for Predicate<'_> {
 impl<'tcx> Eq for Predicate<'tcx> {}
 
 impl<'tcx> Predicate<'tcx> {
-    #[inline(always)]
-    pub fn kind(self) -> Binder<PredicateAtom<'tcx>> {
-        self.inner.kind
-    }
-
-    #[inline(always)]
-    pub fn kind_ref(&self) -> &Binder<PredicateAtom<'tcx>> {
-        &self.inner.kind
-    }
-
     /// Returns the inner `PredicateAtom`.
     ///
     /// The returned atom may contain unbound variables bound to binders skipped in this method.
@@ -1077,8 +1067,7 @@ impl<'tcx> Predicate<'tcx> {
     ///
     /// Note that this method panics in case this predicate has unbound variables.
     pub fn skip_binders(self) -> PredicateAtom<'tcx> {
-        let binder = self.kind();
-        binder.skip_binder()
+        self.inner.binder.skip_binder()
     }
 
     /// Returns the inner `PredicateAtom`.
@@ -1088,29 +1077,30 @@ impl<'tcx> Predicate<'tcx> {
     /// Rebinding the returned atom can causes the previously bound variables
     /// to end up at the wrong binding level.
     pub fn skip_binders_unchecked(self) -> PredicateAtom<'tcx> {
-        let binder = self.kind();
-        binder.skip_binder()
+        self.inner.binder.skip_binder()
     }
 
     /// Converts this to a `Binder<PredicateAtom<'tcx>>`. If the value was an
     /// `Atom`, then it is not allowed to contain escaping bound vars.
     pub fn bound_atom(self) -> Binder<PredicateAtom<'tcx>> {
-        let binder = self.kind();
-        binder
+        self.inner.binder
+    }
+
+    pub fn bound_atom_ref(self) -> &'tcx Binder<PredicateAtom<'tcx>> {
+        &self.inner.binder
     }
 
     /// Allows using a `Binder<PredicateAtom<'tcx>>` even if the given predicate previously
     /// contained unbound variables by shifting these variables outwards.
     pub fn bound_atom_with_opt_escaping(self, _tcx: TyCtxt<'tcx>) -> Binder<PredicateAtom<'tcx>> {
-        let binder = self.kind();
-        binder
+        self.inner.binder
     }
 }
 
 impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Predicate<'tcx> {
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         let PredicateInner {
-            ref kind,
+            ref binder,
 
             // The other fields just provide fast access to information that is
             // also contained in `kind`, so no need to hash them.
@@ -1118,7 +1108,7 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Predicate<'tcx> {
             outer_exclusive_binder: _,
         } = self.inner;
 
-        kind.hash_stable(hcx, hasher);
+        binder.hash_stable(hcx, hasher);
     }
 }
 

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

@@ -2068,7 +2068,7 @@ define_print_and_forward_display! {
     }
 
     ty::Predicate<'tcx> {
-        let binder = self.kind();
+        let binder = self.bound_atom();
         p!(print(binder))
     }
 

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -224,7 +224,7 @@ impl fmt::Debug for ty::ProjectionPredicate<'tcx> {
 
 impl fmt::Debug for ty::Predicate<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{:?}", self.kind())
+        write!(f, "{:?}", self.bound_atom())
     }
 }
 
@@ -1017,12 +1017,12 @@ impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
 
 impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
-        let new = self.inner.kind.fold_with(folder);
+        let new = self.inner.binder.fold_with(folder);
         folder.tcx().reuse_or_mk_predicate(self, new)
     }
 
     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
-        self.inner.kind.super_visit_with(visitor)
+        self.inner.binder.visit_with(visitor)
     }
 
     fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {

compiler/rustc_trait_selection/src/traits/fulfill.rs

@@ -345,7 +345,7 @@ impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx> {
 
         let infcx = self.selcx.infcx();
 
-        let binder = obligation.predicate.kind();
+        let binder = obligation.predicate.bound_atom();
         if binder.skip_binder().has_escaping_bound_vars() {
             match binder.skip_binder() {
                 // Evaluation will discard candidates using the leak check.

compiler/rustc_traits/src/implied_outlives_bounds.rs

@@ -94,7 +94,7 @@ fn compute_implied_outlives_bounds<'tcx>(
         // region relationships.
         implied_bounds.extend(obligations.into_iter().flat_map(|obligation| {
             assert!(!obligation.has_escaping_bound_vars());
-            let binder = obligation.predicate.kind();
+            let binder = obligation.predicate.bound_atom();
             if binder.skip_binder().has_escaping_bound_vars() {
                 vec![]
             } else {

compiler/rustc_typeck/src/outlives/mod.rs

@@ -31,7 +31,7 @@ fn inferred_outlives_of(tcx: TyCtxt<'_>, item_def_id: DefId) -> &[(ty::Predicate
                     let mut pred: Vec<String> = predicates
                         .iter()
                         .map(|(out_pred, _)| {
-                            let binder = out_pred.kind();
+                            let binder = out_pred.bound_atom();
                             match binder.skip_binder() {
                                 ty::PredicateAtom::RegionOutlives(p) => p.to_string(),
                                 ty::PredicateAtom::TypeOutlives(p) => p.to_string(),

src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs

@@ -115,7 +115,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
             .filter(|p| !p.is_global())
             .filter_map(|obligation| {
                 // Note that we do not want to deal with qualified predicates here.
-                let binder = obligation.predicate.kind();
+                let binder = obligation.predicate.bound_atom();
                 match binder.skip_binder() {
                     ty::PredicateAtom::Trait(pred, _) if !binder.has_escaping_bound_vars() => {
                         if pred.def_id() == sized_trait {