Auto merge of #125001 - compiler-errors:uplift-trait-predicate, r=lcnr

Uplift various `*Predicate` types into `rustc_type_ir`

Uplifts `ProjectionPredicate`, `ExistentialTraitRef`, `ExistentialProjection`, `TraitPredicate`, `NormalizesTo`, `CoercePredicate`, and `SubtypePredicate`.

Adds `rustc_type_ir_macros`, which semi-duplicates the derive for `TypeVisitable`, `TypeFoldable`, and `Lift`, but in a way that is interner-agnostic.

Moves `rustc_type_ir::trait_ref` to `rustc_type_ir::predicate`. The specific placement of all these structs doesn't matter b/c of glob imports, tho.

Author: bors

Diff for: Cargo.lock

@@ -4837,9 +4837,20 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
+ "rustc_type_ir_macros",
  "smallvec",
 ]
 
+[[package]]
+name = "rustc_type_ir_macros"
+version = "0.0.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.62",
+ "synstructure",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.0"

Diff for: compiler/rustc_errors/src/diagnostic_impls.rs

@@ -100,6 +100,12 @@ impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::TraitRef<I> {
     }
 }
 
+impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::ExistentialTraitRef<I> {
+    fn into_diag_arg(self) -> DiagArgValue {
+        self.to_string().into_diag_arg()
+    }
+}
+
 into_diag_arg_for_number!(i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize);
 
 impl IntoDiagArg for bool {

Diff for: compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs

@@ -7,7 +7,7 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_lint_defs::builtin::UNUSED_ASSOCIATED_TYPE_BOUNDS;
 use rustc_middle::ty::fold::BottomUpFolder;
-use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable};
+use rustc_middle::ty::{self, ExistentialPredicateStableCmpExt as _, Ty, TyCtxt, TypeFoldable};
 use rustc_middle::ty::{DynKind, ToPredicate};
 use rustc_span::{ErrorGuaranteed, Span};
 use rustc_trait_selection::traits::error_reporting::report_object_safety_error;

Diff for: compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs

@@ -1,9 +1,8 @@
 use rustc_hir as hir;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_macros::{LintDiagnostic, Subdiagnostic};
-use rustc_middle::ty::{
-    self, fold::BottomUpFolder, print::TraitPredPrintModifiersAndPath, Ty, TypeFoldable,
-};
+use rustc_middle::ty::print::{PrintTraitPredicateExt as _, TraitPredPrintModifiersAndPath};
+use rustc_middle::ty::{self, fold::BottomUpFolder, Ty, TypeFoldable};
 use rustc_session::{declare_lint, declare_lint_pass};
 use rustc_span::{symbol::kw, Span};
 use rustc_trait_selection::traits;

Diff for: compiler/rustc_middle/src/ty/context.rs

@@ -26,6 +26,7 @@ use crate::traits::solve;
 use crate::traits::solve::{
     ExternalConstraints, ExternalConstraintsData, PredefinedOpaques, PredefinedOpaquesData,
 };
+use crate::ty::predicate::ExistentialPredicateStableCmpExt as _;
 use crate::ty::{
     self, AdtDef, AdtDefData, AdtKind, Binder, Clause, Clauses, Const, ConstData,
     GenericParamDefKind, ImplPolarity, List, ListWithCachedTypeInfo, ParamConst, ParamTy, Pattern,
@@ -99,17 +100,17 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type CanonicalVars = CanonicalVarInfos<'tcx>;
 
     type Ty = Ty<'tcx>;
-    type Pat = Pattern<'tcx>;
     type Tys = &'tcx List<Ty<'tcx>>;
     type AliasTy = ty::AliasTy<'tcx>;
     type ParamTy = ParamTy;
     type BoundTy = ty::BoundTy;
     type PlaceholderTy = ty::PlaceholderType;
-
     type ErrorGuaranteed = ErrorGuaranteed;
+
     type BoundExistentialPredicates = &'tcx List<PolyExistentialPredicate<'tcx>>;
     type PolyFnSig = PolyFnSig<'tcx>;
     type AllocId = crate::mir::interpret::AllocId;
+    type Pat = Pattern<'tcx>;
 
     type Const = ty::Const<'tcx>;
     type AliasConst = ty::UnevaluatedConst<'tcx>;
@@ -121,8 +122,8 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
 
     type Region = Region<'tcx>;
     type EarlyParamRegion = ty::EarlyParamRegion;
-    type BoundRegion = ty::BoundRegion;
     type LateParamRegion = ty::LateParamRegion;
+    type BoundRegion = ty::BoundRegion;
     type InferRegion = ty::RegionVid;
     type PlaceholderRegion = ty::PlaceholderRegion;
 
@@ -146,13 +147,21 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         self.generics_of(def_id)
     }
 
+    fn mk_args(self, args: &[Self::GenericArg]) -> Self::GenericArgs {
+        self.mk_args(args)
+    }
+
     fn check_and_mk_args(
         self,
         def_id: DefId,
         args: impl IntoIterator<Item: Into<ty::GenericArg<'tcx>>>,
     ) -> ty::GenericArgsRef<'tcx> {
         self.check_and_mk_args(def_id, args)
     }
+
+    fn parent(self, def_id: Self::DefId) -> Self::DefId {
+        self.parent(def_id)
+    }
 }
 
 type InternedSet<'tcx, T> = ShardedHashMap<InternedInSet<'tcx, T>, ()>;

Diff for: compiler/rustc_middle/src/ty/mod.rs

@@ -96,13 +96,13 @@ pub use self::list::{List, ListWithCachedTypeInfo};
 pub use self::parameterized::ParameterizedOverTcx;
 pub use self::pattern::{Pattern, PatternKind};
 pub use self::predicate::{
-    Clause, ClauseKind, CoercePredicate, ExistentialPredicate, ExistentialProjection,
-    ExistentialTraitRef, NormalizesTo, OutlivesPredicate, PolyCoercePredicate,
-    PolyExistentialPredicate, PolyExistentialProjection, PolyExistentialTraitRef,
-    PolyProjectionPredicate, PolyRegionOutlivesPredicate, PolySubtypePredicate, PolyTraitPredicate,
-    PolyTraitRef, PolyTypeOutlivesPredicate, Predicate, PredicateKind, ProjectionPredicate,
-    RegionOutlivesPredicate, SubtypePredicate, ToPolyTraitRef, ToPredicate, TraitPredicate,
-    TraitRef, TypeOutlivesPredicate,
+    Clause, ClauseKind, CoercePredicate, ExistentialPredicate, ExistentialPredicateStableCmpExt,
+    ExistentialProjection, ExistentialTraitRef, NormalizesTo, OutlivesPredicate,
+    PolyCoercePredicate, PolyExistentialPredicate, PolyExistentialProjection,
+    PolyExistentialTraitRef, PolyProjectionPredicate, PolyRegionOutlivesPredicate,
+    PolySubtypePredicate, PolyTraitPredicate, PolyTraitRef, PolyTypeOutlivesPredicate, Predicate,
+    PredicateKind, ProjectionPredicate, RegionOutlivesPredicate, SubtypePredicate, ToPolyTraitRef,
+    ToPredicate, TraitPredicate, TraitRef, TypeOutlivesPredicate,
 };
 pub use self::region::{
     BoundRegion, BoundRegionKind, BoundRegionKind::*, EarlyParamRegion, LateParamRegion, Region,
@@ -275,61 +275,6 @@ pub enum ImplSubject<'tcx> {
     Inherent(Ty<'tcx>),
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable, Debug)]
-#[derive(TypeFoldable, TypeVisitable)]
-pub enum ImplPolarity {
-    /// `impl Trait for Type`
-    Positive,
-    /// `impl !Trait for Type`
-    Negative,
-    /// `#[rustc_reservation_impl] impl Trait for Type`
-    ///
-    /// This is a "stability hack", not a real Rust feature.
-    /// See #64631 for details.
-    Reservation,
-}
-
-impl fmt::Display for ImplPolarity {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Positive => f.write_str("positive"),
-            Self::Negative => f.write_str("negative"),
-            Self::Reservation => f.write_str("reservation"),
-        }
-    }
-}
-
-/// Polarity for a trait predicate. May either be negative or positive.
-/// Distinguished from [`ImplPolarity`] since we never compute goals with
-/// "reservation" level.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable, Debug)]
-#[derive(TypeFoldable, TypeVisitable)]
-pub enum PredicatePolarity {
-    /// `Type: Trait`
-    Positive,
-    /// `Type: !Trait`
-    Negative,
-}
-
-impl PredicatePolarity {
-    /// Flips polarity by turning `Positive` into `Negative` and `Negative` into `Positive`.
-    pub fn flip(&self) -> PredicatePolarity {
-        match self {
-            PredicatePolarity::Positive => PredicatePolarity::Negative,
-            PredicatePolarity::Negative => PredicatePolarity::Positive,
-        }
-    }
-}
-
-impl fmt::Display for PredicatePolarity {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Positive => f.write_str("positive"),
-            Self::Negative => f.write_str("negative"),
-        }
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable, Debug)]
 #[derive(TypeFoldable, TypeVisitable)]
 pub enum Asyncness {