Auto merge of rust-lang#116993 - compiler-errors:clause-kind, r=jackh726

Uplift `ClauseKind` and `PredicateKind` into `rustc_type_ir`

Uplift `ClauseKind` and `PredicateKind` into `rustc_type_ir`.

Blocked on rust-lang#116951

r? `@ghost`

Author: bors

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

@@ -230,9 +230,9 @@ impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D>
                 assert!(pos >= SHORTHAND_OFFSET);
                 let shorthand = pos - SHORTHAND_OFFSET;
 
-                decoder.with_position(shorthand, ty::PredicateKind::decode)
+                decoder.with_position(shorthand, <ty::PredicateKind<'tcx> as Decodable<D>>::decode)
             } else {
-                ty::PredicateKind::decode(decoder)
+                <ty::PredicateKind<'tcx> as Decodable<D>>::decode(decoder)
             },
             bound_vars,
         )

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

@@ -84,21 +84,24 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type AdtDef = ty::AdtDef<'tcx>;
     type GenericArgs = ty::GenericArgsRef<'tcx>;
     type GenericArg = ty::GenericArg<'tcx>;
+    type Term = ty::Term<'tcx>;
+
     type Binder<T> = Binder<'tcx, T>;
-    type Predicate = Predicate<'tcx>;
-    type PredicateKind = ty::PredicateKind<'tcx>;
     type TypeAndMut = TypeAndMut<'tcx>;
+
     type Ty = Ty<'tcx>;
     type Tys = &'tcx List<Ty<'tcx>>;
     type AliasTy = ty::AliasTy<'tcx>;
     type ParamTy = ParamTy;
     type BoundTy = ty::BoundTy;
     type PlaceholderTy = ty::PlaceholderType;
     type InferTy = InferTy;
+
     type ErrorGuaranteed = ErrorGuaranteed;
     type BoundExistentialPredicates = &'tcx List<PolyExistentialPredicate<'tcx>>;
     type PolyFnSig = PolyFnSig<'tcx>;
     type AllocId = crate::mir::interpret::AllocId;
+
     type Const = ty::Const<'tcx>;
     type InferConst = ty::InferConst;
     type AliasConst = ty::UnevaluatedConst<'tcx>;
@@ -107,13 +110,23 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type BoundConst = ty::BoundVar;
     type ValueConst = ty::ValTree<'tcx>;
     type ExprConst = ty::Expr<'tcx>;
+
     type Region = Region<'tcx>;
     type EarlyBoundRegion = ty::EarlyBoundRegion;
     type BoundRegion = ty::BoundRegion;
     type FreeRegion = ty::FreeRegion;
     type InferRegion = ty::RegionVid;
     type PlaceholderRegion = ty::PlaceholderRegion;
 
+    type Predicate = Predicate<'tcx>;
+    type TraitPredicate = ty::TraitPredicate<'tcx>;
+    type RegionOutlivesPredicate = ty::RegionOutlivesPredicate<'tcx>;
+    type TypeOutlivesPredicate = ty::TypeOutlivesPredicate<'tcx>;
+    type ProjectionPredicate = ty::ProjectionPredicate<'tcx>;
+    type SubtypePredicate = ty::SubtypePredicate<'tcx>;
+    type CoercePredicate = ty::CoercePredicate<'tcx>;
+    type ClosureKind = ty::ClosureKind;
+
     fn ty_and_mut_to_parts(
         TypeAndMut { ty, mutbl }: TypeAndMut<'tcx>,
     ) -> (Self::Ty, ty::Mutability) {

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

@@ -97,12 +97,12 @@ pub use self::rvalue_scopes::RvalueScopes;
 pub use self::sty::BoundRegionKind::*;
 pub use self::sty::{
     AliasTy, Article, Binder, BoundRegion, BoundRegionKind, BoundTy, BoundTyKind, BoundVar,
-    BoundVariableKind, CanonicalPolyFnSig, ClosureArgs, ClosureArgsParts, ConstKind, ConstVid,
-    CoroutineArgs, CoroutineArgsParts, EarlyBoundRegion, EffectVid, ExistentialPredicate,
+    BoundVariableKind, CanonicalPolyFnSig, ClauseKind, ClosureArgs, ClosureArgsParts, ConstKind,
+    ConstVid, CoroutineArgs, CoroutineArgsParts, EarlyBoundRegion, EffectVid, ExistentialPredicate,
     ExistentialProjection, ExistentialTraitRef, FnSig, FreeRegion, GenSig, InlineConstArgs,
     InlineConstArgsParts, ParamConst, ParamTy, PolyExistentialPredicate, PolyExistentialProjection,
-    PolyExistentialTraitRef, PolyFnSig, PolyGenSig, PolyTraitRef, Region, RegionKind, RegionVid,
-    TraitRef, TyKind, TypeAndMut, UpvarArgs, VarianceDiagInfo,
+    PolyExistentialTraitRef, PolyFnSig, PolyGenSig, PolyTraitRef, PredicateKind, Region,
+    RegionKind, RegionVid, TraitRef, TyKind, TypeAndMut, UpvarArgs, VarianceDiagInfo,
 };
 pub use self::trait_def::TraitDef;
 pub use self::typeck_results::{
@@ -626,98 +626,6 @@ impl<'tcx> Clause<'tcx> {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-/// A clause is something that can appear in where bounds or be inferred
-/// by implied bounds.
-pub enum ClauseKind<'tcx> {
-    /// Corresponds to `where Foo: Bar<A, B, C>`. `Foo` here would be
-    /// the `Self` type of the trait reference and `A`, `B`, and `C`
-    /// would be the type parameters.
-    Trait(TraitPredicate<'tcx>),
-
-    /// `where 'a: 'b`
-    RegionOutlives(RegionOutlivesPredicate<'tcx>),
-
-    /// `where T: 'a`
-    TypeOutlives(TypeOutlivesPredicate<'tcx>),
-
-    /// `where <T as TraitRef>::Name == X`, approximately.
-    /// See the `ProjectionPredicate` struct for details.
-    Projection(ProjectionPredicate<'tcx>),
-
-    /// Ensures that a const generic argument to a parameter `const N: u8`
-    /// is of type `u8`.
-    ConstArgHasType(Const<'tcx>, Ty<'tcx>),
-
-    /// No syntax: `T` well-formed.
-    WellFormed(GenericArg<'tcx>),
-
-    /// Constant initializer must evaluate successfully.
-    ConstEvaluatable(ty::Const<'tcx>),
-}
-
-#[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-pub enum PredicateKind<'tcx> {
-    /// Prove a clause
-    Clause(ClauseKind<'tcx>),
-
-    /// Trait must be object-safe.
-    ObjectSafe(DefId),
-
-    /// No direct syntax. May be thought of as `where T: FnFoo<...>`
-    /// for some generic args `...` and `T` being a closure type.
-    /// Satisfied (or refuted) once we know the closure's kind.
-    ClosureKind(DefId, GenericArgsRef<'tcx>, ClosureKind),
-
-    /// `T1 <: T2`
-    ///
-    /// This obligation is created most often when we have two
-    /// unresolved type variables and hence don't have enough
-    /// information to process the subtyping obligation yet.
-    Subtype(SubtypePredicate<'tcx>),
-
-    /// `T1` coerced to `T2`
-    ///
-    /// Like a subtyping obligation, this is created most often
-    /// when we have two unresolved type variables and hence
-    /// don't have enough information to process the coercion
-    /// obligation yet. At the moment, we actually process coercions
-    /// very much like subtyping and don't handle the full coercion
-    /// logic.
-    Coerce(CoercePredicate<'tcx>),
-
-    /// Constants must be equal. The first component is the const that is expected.
-    ConstEquate(Const<'tcx>, Const<'tcx>),
-
-    /// A marker predicate that is always ambiguous.
-    /// Used for coherence to mark opaque types as possibly equal to each other but ambiguous.
-    Ambiguous,
-
-    /// Separate from `ClauseKind::Projection` which is used for normalization in new solver.
-    /// This predicate requires two terms to be equal to eachother.
-    ///
-    /// Only used for new solver
-    AliasRelate(Term<'tcx>, Term<'tcx>, AliasRelationDirection),
-}
-
-#[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
-#[derive(HashStable, Debug)]
-pub enum AliasRelationDirection {
-    Equate,
-    Subtype,
-}
-
-impl std::fmt::Display for AliasRelationDirection {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            AliasRelationDirection::Equate => write!(f, "=="),
-            AliasRelationDirection::Subtype => write!(f, "<:"),
-        }
-    }
-}
-
 /// The crate outlives map is computed during typeck and contains the
 /// outlives of every item in the local crate. You should not use it
 /// directly, because to do so will make your pass dependent on the

Diff for: compiler/rustc_middle/src/ty/print/pretty.rs

@@ -2649,6 +2649,13 @@ macro_rules! forward_display_to_print {
 }
 
 macro_rules! define_print_and_forward_display {
+    (($self:ident, $cx:ident): $($ty:ty $print:block)+) => {
+        define_print!(($self, $cx): $($ty $print)*);
+        forward_display_to_print!($($ty),+);
+    };
+}
+
+macro_rules! define_print {
     (($self:ident, $cx:ident): $($ty:ty $print:block)+) => {
         $(impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for $ty {
             fn print(&$self, $cx: &mut P) -> Result<(), PrintError> {
@@ -2660,8 +2667,6 @@ macro_rules! define_print_and_forward_display {
                 Ok(())
             }
         })+
-
-        forward_display_to_print!($($ty),+);
     };
 }
 
@@ -2759,6 +2764,51 @@ forward_display_to_print! {
     ty::OutlivesPredicate<ty::Region<'tcx>, ty::Region<'tcx>>
 }
 
+define_print! {
+    (self, cx):
+
+    ty::ClauseKind<'tcx> {
+        match *self {
+            ty::ClauseKind::Trait(ref data) => {
+                p!(print(data))
+            }
+            ty::ClauseKind::RegionOutlives(predicate) => p!(print(predicate)),
+            ty::ClauseKind::TypeOutlives(predicate) => p!(print(predicate)),
+            ty::ClauseKind::Projection(predicate) => p!(print(predicate)),
+            ty::ClauseKind::ConstArgHasType(ct, ty) => {
+                p!("the constant `", print(ct), "` has type `", print(ty), "`")
+            },
+            ty::ClauseKind::WellFormed(arg) => p!(print(arg), " well-formed"),
+            ty::ClauseKind::ConstEvaluatable(ct) => {
+                p!("the constant `", print(ct), "` can be evaluated")
+            }
+        }
+    }
+
+    ty::PredicateKind<'tcx> {
+        match *self {
+            ty::PredicateKind::Clause(data) => {
+                p!(print(data))
+            }
+            ty::PredicateKind::Subtype(predicate) => p!(print(predicate)),
+            ty::PredicateKind::Coerce(predicate) => p!(print(predicate)),
+            ty::PredicateKind::ObjectSafe(trait_def_id) => {
+                p!("the trait `", print_def_path(trait_def_id, &[]), "` is object-safe")
+            }
+            ty::PredicateKind::ClosureKind(closure_def_id, _closure_args, kind) => p!(
+                "the closure `",
+                print_value_path(closure_def_id, &[]),
+                write("` implements the trait `{}`", kind)
+            ),
+            ty::PredicateKind::ConstEquate(c1, c2) => {
+                p!("the constant `", print(c1), "` equals `", print(c2), "`")
+            }
+            ty::PredicateKind::Ambiguous => p!("ambiguous"),
+            ty::PredicateKind::AliasRelate(t1, t2, dir) => p!(print(t1), write(" {} ", dir), print(t2)),
+        }
+    }
+}
+
 define_print_and_forward_display! {
     (self, cx):
 
@@ -2887,55 +2937,13 @@ define_print_and_forward_display! {
     }
 
     ty::Predicate<'tcx> {
-        let binder = self.kind();
-        p!(print(binder))
+        p!(print(self.kind()))
     }
 
     ty::Clause<'tcx> {
         p!(print(self.kind()))
     }
 
-    ty::ClauseKind<'tcx> {
-        match *self {
-            ty::ClauseKind::Trait(ref data) => {
-                p!(print(data))
-            }
-            ty::ClauseKind::RegionOutlives(predicate) => p!(print(predicate)),
-            ty::ClauseKind::TypeOutlives(predicate) => p!(print(predicate)),
-            ty::ClauseKind::Projection(predicate) => p!(print(predicate)),
-            ty::ClauseKind::ConstArgHasType(ct, ty) => {
-                p!("the constant `", print(ct), "` has type `", print(ty), "`")
-            },
-            ty::ClauseKind::WellFormed(arg) => p!(print(arg), " well-formed"),
-            ty::ClauseKind::ConstEvaluatable(ct) => {
-                p!("the constant `", print(ct), "` can be evaluated")
-            }
-        }
-    }
-
-    ty::PredicateKind<'tcx> {
-        match *self {
-            ty::PredicateKind::Clause(data) => {
-                p!(print(data))
-            }
-            ty::PredicateKind::Subtype(predicate) => p!(print(predicate)),
-            ty::PredicateKind::Coerce(predicate) => p!(print(predicate)),
-            ty::PredicateKind::ObjectSafe(trait_def_id) => {
-                p!("the trait `", print_def_path(trait_def_id, &[]), "` is object-safe")
-            }
-            ty::PredicateKind::ClosureKind(closure_def_id, _closure_args, kind) => p!(
-                "the closure `",
-                print_value_path(closure_def_id, &[]),
-                write("` implements the trait `{}`", kind)
-            ),
-            ty::PredicateKind::ConstEquate(c1, c2) => {
-                p!("the constant `", print(c1), "` equals `", print(c2), "`")
-            }
-            ty::PredicateKind::Ambiguous => p!("ambiguous"),
-            ty::PredicateKind::AliasRelate(t1, t2, dir) => p!(print(t1), write(" {} ", dir), print(t2)),
-        }
-    }
-
     GenericArg<'tcx> {
         match self.unpack() {
             GenericArgKind::Lifetime(lt) => p!(print(lt)),

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

@@ -185,43 +185,6 @@ impl<'tcx> fmt::Debug for ty::Clause<'tcx> {
     }
 }
 
-impl<'tcx> fmt::Debug for ty::ClauseKind<'tcx> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            ty::ClauseKind::ConstArgHasType(ct, ty) => write!(f, "ConstArgHasType({ct:?}, {ty:?})"),
-            ty::ClauseKind::Trait(ref a) => a.fmt(f),
-            ty::ClauseKind::RegionOutlives(ref pair) => pair.fmt(f),
-            ty::ClauseKind::TypeOutlives(ref pair) => pair.fmt(f),
-            ty::ClauseKind::Projection(ref pair) => pair.fmt(f),
-            ty::ClauseKind::WellFormed(ref data) => write!(f, "WellFormed({data:?})"),
-            ty::ClauseKind::ConstEvaluatable(ct) => {
-                write!(f, "ConstEvaluatable({ct:?})")
-            }
-        }
-    }
-}
-
-impl<'tcx> fmt::Debug for ty::PredicateKind<'tcx> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            ty::PredicateKind::Clause(ref a) => a.fmt(f),
-            ty::PredicateKind::Subtype(ref pair) => pair.fmt(f),
-            ty::PredicateKind::Coerce(ref pair) => pair.fmt(f),
-            ty::PredicateKind::ObjectSafe(trait_def_id) => {
-                write!(f, "ObjectSafe({trait_def_id:?})")
-            }
-            ty::PredicateKind::ClosureKind(closure_def_id, closure_args, kind) => {
-                write!(f, "ClosureKind({closure_def_id:?}, {closure_args:?}, {kind:?})")
-            }
-            ty::PredicateKind::ConstEquate(c1, c2) => write!(f, "ConstEquate({c1:?}, {c2:?})"),
-            ty::PredicateKind::Ambiguous => write!(f, "Ambiguous"),
-            ty::PredicateKind::AliasRelate(t1, t2, dir) => {
-                write!(f, "AliasRelate({t1:?}, {dir:?}, {t2:?})")
-            }
-        }
-    }
-}
-
 impl<'tcx> fmt::Debug for AliasTy<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         WithInfcx::with_no_infcx(self).fmt(f)
@@ -503,7 +466,6 @@ TrivialTypeTraversalAndLiftImpls! {
     ::rustc_hir::Mutability,
     ::rustc_hir::Unsafety,
     ::rustc_target::spec::abi::Abi,
-    crate::ty::AliasRelationDirection,
     crate::ty::ClosureKind,
     crate::ty::ParamConst,
     crate::ty::ParamTy,

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

@@ -32,10 +32,12 @@ use std::fmt;
 use std::ops::{ControlFlow, Deref, Range};
 use ty::util::IntTypeExt;
 
+use rustc_type_ir::ClauseKind as IrClauseKind;
 use rustc_type_ir::CollectAndApply;
 use rustc_type_ir::ConstKind as IrConstKind;
 use rustc_type_ir::DebugWithInfcx;
 use rustc_type_ir::DynKind;
+use rustc_type_ir::PredicateKind as IrPredicateKind;
 use rustc_type_ir::RegionKind as IrRegionKind;
 use rustc_type_ir::TyKind as IrTyKind;
 use rustc_type_ir::TyKind::*;
@@ -47,6 +49,8 @@ use super::GenericParamDefKind;
 pub type TyKind<'tcx> = IrTyKind<TyCtxt<'tcx>>;
 pub type RegionKind<'tcx> = IrRegionKind<TyCtxt<'tcx>>;
 pub type ConstKind<'tcx> = IrConstKind<TyCtxt<'tcx>>;
+pub type PredicateKind<'tcx> = IrPredicateKind<TyCtxt<'tcx>>;
+pub type ClauseKind<'tcx> = IrClauseKind<TyCtxt<'tcx>>;
 
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
 #[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]