rust-lang · bors · Nov 30, 2022 · Nov 25, 2022
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
@@ -33,7 +33,7 @@ use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs}
 use rustc_middle::mir::mono::Linkage;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::util::{Discr, IntTypeExt};
-use rustc_middle::ty::{self, AdtKind, Const, DefIdTree, IsSuggestable, Ty, TyCtxt};
+use rustc_middle::ty::{self, AdtKind, Const, DefIdTree, IsSuggestable, ToPredicate, Ty, TyCtxt};
 use rustc_session::lint;
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
@@ -1366,12 +1366,14 @@ fn predicates_defined_on(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericPredicate
             "predicates_defined_on: inferred_outlives_of({:?}) = {:?}",
             def_id, inferred_outlives,
         );
+        let inferred_outlives_iter =
+            inferred_outlives.iter().map(|(clause, span)| ((*clause).to_predicate(tcx), *span));
         if result.predicates.is_empty() {
-            result.predicates = inferred_outlives;
+            result.predicates = tcx.arena.alloc_from_iter(inferred_outlives_iter);
         } else {
-            result.predicates = tcx
-                .arena
-                .alloc_from_iter(result.predicates.iter().chain(inferred_outlives).copied());
+            result.predicates = tcx.arena.alloc_from_iter(
+                result.predicates.into_iter().copied().chain(inferred_outlives_iter),
+            );
         }
     }
 

diff --git a/compiler/rustc_hir_analysis/src/outlives/mod.rs b/compiler/rustc_hir_analysis/src/outlives/mod.rs
@@ -3,7 +3,7 @@ use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::subst::GenericArgKind;
-use rustc_middle::ty::{self, CratePredicatesMap, ToPredicate, TyCtxt};
+use rustc_middle::ty::{self, CratePredicatesMap, TyCtxt};
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 
@@ -17,7 +17,7 @@ pub fn provide(providers: &mut Providers) {
     *providers = Providers { inferred_outlives_of, inferred_outlives_crate, ..*providers };
 }
 
-fn inferred_outlives_of(tcx: TyCtxt<'_>, item_def_id: DefId) -> &[(ty::Predicate<'_>, Span)] {
+fn inferred_outlives_of(tcx: TyCtxt<'_>, item_def_id: DefId) -> &[(ty::Clause<'_>, Span)] {
     let id = tcx.hir().local_def_id_to_hir_id(item_def_id.expect_local());
 
     if matches!(tcx.def_kind(item_def_id), hir::def::DefKind::AnonConst) && tcx.lazy_normalization()
@@ -50,12 +50,10 @@ fn inferred_outlives_of(tcx: TyCtxt<'_>, item_def_id: DefId) -> &[(ty::Predicate
                 if tcx.has_attr(item_def_id, sym::rustc_outlives) {
                     let mut pred: Vec<String> = predicates
                         .iter()
-                        .map(|(out_pred, _)| match out_pred.kind().skip_binder() {
-                            ty::PredicateKind::Clause(ty::Clause::RegionOutlives(p)) => {
-                                p.to_string()
-                            }
-                            ty::PredicateKind::Clause(ty::Clause::TypeOutlives(p)) => p.to_string(),
-                            err => bug!("unexpected predicate {:?}", err),
+                        .map(|(out_pred, _)| match out_pred {
+                            ty::Clause::RegionOutlives(p) => p.to_string(),
+                            ty::Clause::TypeOutlives(p) => p.to_string(),
+                            err => bug!("unexpected clause {:?}", err),
                         })
                         .collect();
                     pred.sort();
@@ -103,19 +101,11 @@ fn inferred_outlives_crate(tcx: TyCtxt<'_>, (): ()) -> CratePredicatesMap<'_> {
                 |(ty::OutlivesPredicate(kind1, region2), &span)| {
                     match kind1.unpack() {
                         GenericArgKind::Type(ty1) => Some((
-                            ty::Binder::dummy(ty::PredicateKind::Clause(ty::Clause::TypeOutlives(
-                                ty::OutlivesPredicate(ty1, *region2),
-                            )))
-                            .to_predicate(tcx),
+                            ty::Clause::TypeOutlives(ty::OutlivesPredicate(ty1, *region2)),
                             span,
                         )),
                         GenericArgKind::Lifetime(region1) => Some((
-                            ty::Binder::dummy(ty::PredicateKind::Clause(
-                                ty::Clause::RegionOutlives(ty::OutlivesPredicate(
-                                    region1, *region2,
-                                )),
-                            ))
-                            .to_predicate(tcx),
+                            ty::Clause::RegionOutlives(ty::OutlivesPredicate(region1, *region2)),
                             span,
                         )),
                         GenericArgKind::Const(_) => {

diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
@@ -2046,16 +2046,13 @@ declare_lint_pass!(ExplicitOutlivesRequirements => [EXPLICIT_OUTLIVES_REQUIREMEN
 
 impl ExplicitOutlivesRequirements {
     fn lifetimes_outliving_lifetime<'tcx>(
-        inferred_outlives: &'tcx [(ty::Predicate<'tcx>, Span)],
+        inferred_outlives: &'tcx [(ty::Clause<'tcx>, Span)],
         def_id: DefId,
     ) -> Vec<ty::Region<'tcx>> {
         inferred_outlives
             .iter()
-            .filter_map(|(pred, _)| match pred.kind().skip_binder() {
-                ty::PredicateKind::Clause(ty::Clause::RegionOutlives(ty::OutlivesPredicate(
-                    a,
-                    b,
-                ))) => match *a {
+            .filter_map(|(clause, _)| match *clause {
+                ty::Clause::RegionOutlives(ty::OutlivesPredicate(a, b)) => match *a {
                     ty::ReEarlyBound(ebr) if ebr.def_id == def_id => Some(b),
                     _ => None,
                 },
@@ -2065,16 +2062,15 @@ impl ExplicitOutlivesRequirements {
     }
 
     fn lifetimes_outliving_type<'tcx>(
-        inferred_outlives: &'tcx [(ty::Predicate<'tcx>, Span)],
+        inferred_outlives: &'tcx [(ty::Clause<'tcx>, Span)],
         index: u32,
     ) -> Vec<ty::Region<'tcx>> {
         inferred_outlives
             .iter()
-            .filter_map(|(pred, _)| match pred.kind().skip_binder() {
-                ty::PredicateKind::Clause(ty::Clause::TypeOutlives(ty::OutlivesPredicate(
-                    a,
-                    b,
-                ))) => a.is_param(index).then_some(b),
+            .filter_map(|(clause, _)| match *clause {
+                ty::Clause::TypeOutlives(ty::OutlivesPredicate(a, b)) => {
+                    a.is_param(index).then_some(b)
+                }
                 _ => None,
             })
             .collect()

diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -353,7 +353,7 @@ define_tables! {
     explicit_predicates_of: Table<DefIndex, LazyValue<ty::GenericPredicates<'static>>>,
     generics_of: Table<DefIndex, LazyValue<ty::Generics>>,
     // As an optimization, a missing entry indicates an empty `&[]`.
-    inferred_outlives_of: Table<DefIndex, LazyArray<(ty::Predicate<'static>, Span)>>,
+    inferred_outlives_of: Table<DefIndex, LazyArray<(ty::Clause<'static>, Span)>>,
     super_predicates_of: Table<DefIndex, LazyValue<ty::GenericPredicates<'static>>>,
     type_of: Table<DefIndex, LazyValue<Ty<'static>>>,
     variances_of: Table<DefIndex, LazyArray<ty::Variance>>,

diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
@@ -562,7 +562,7 @@ rustc_queries! {
 
     /// Returns the inferred outlives predicates (e.g., for `struct
     /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
-    query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
+    query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Clause<'tcx>, Span)] {
         desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
         cache_on_disk_if { key.is_local() }
         separate_provide_extern

diff --git a/compiler/rustc_middle/src/ty/codec.rs b/compiler/rustc_middle/src/ty/codec.rs
@@ -345,6 +345,14 @@ impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
     }
 }
 
+impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for [(ty::Clause<'tcx>, Span)] {
+    fn decode(decoder: &mut D) -> &'tcx Self {
+        decoder.interner().arena.alloc_from_iter(
+            (0..decoder.read_usize()).map(|_| Decodable::decode(decoder)).collect::<Vec<_>>(),
+        )
+    }
+}
+
 impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
     for ty::List<ty::BoundVariableKind>
 {

diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
@@ -734,7 +734,7 @@ pub struct CratePredicatesMap<'tcx> {
     /// For each struct with outlive bounds, maps to a vector of the
     /// predicate of its outlive bounds. If an item has no outlives
     /// bounds, it will have no entry.
-    pub predicates: FxHashMap<DefId, &'tcx [(Predicate<'tcx>, Span)]>,
+    pub predicates: FxHashMap<DefId, &'tcx [(Clause<'tcx>, Span)]>,
 }
 
 impl<'tcx> Predicate<'tcx> {
@@ -1167,6 +1167,13 @@ impl<'tcx> ToPredicate<'tcx, Predicate<'tcx>> for Binder<'tcx, PredicateKind<'tc
     }
 }
 
+impl<'tcx> ToPredicate<'tcx, Predicate<'tcx>> for Clause<'tcx> {
+    #[inline(always)]
+    fn to_predicate(self, tcx: TyCtxt<'tcx>) -> Predicate<'tcx> {
+        tcx.mk_predicate(ty::Binder::dummy(ty::PredicateKind::Clause(self)))
+    }
+}
+
 impl<'tcx> ToPredicate<'tcx, Predicate<'tcx>> for Binder<'tcx, TraitRef<'tcx>> {
     #[inline(always)]
     fn to_predicate(self, tcx: TyCtxt<'tcx>) -> Predicate<'tcx> {

diff --git a/compiler/rustc_middle/src/ty/parameterized.rs b/compiler/rustc_middle/src/ty/parameterized.rs
@@ -5,7 +5,7 @@ use rustc_index::vec::{Idx, IndexVec};
 use crate::middle::exported_symbols::ExportedSymbol;
 use crate::mir::Body;
 use crate::ty::{
-    self, Const, FnSig, GeneratorDiagnosticData, GenericPredicates, Predicate, TraitRef, Ty,
+    self, Clause, Const, FnSig, GeneratorDiagnosticData, GenericPredicates, Predicate, TraitRef, Ty,
 };
 
 pub trait ParameterizedOverTcx: 'static {
@@ -121,6 +121,7 @@ parameterized_over_tcx! {
     TraitRef,
     Const,
     Predicate,
+    Clause,
     GeneratorDiagnosticData,
     Body,
     ExportedSymbol,

diff --git a/compiler/rustc_query_impl/src/on_disk_cache.rs b/compiler/rustc_query_impl/src/on_disk_cache.rs
@@ -818,6 +818,12 @@ impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx [(ty::Predicate<'tcx>
     }
 }
 
+impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx [(ty::Clause<'tcx>, Span)] {
+    fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {
+        RefDecodable::decode(d)
+    }
+}
+
 impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx [rustc_ast::InlineAsmTemplatePiece] {
     fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {
         RefDecodable::decode(d)