Uplift ExistentialTraitRef, ExistentialProjection, ProjectionPredicate

Author: compiler-errors

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -100,6 +100,14 @@ 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 {

compiler/rustc_middle/src/ty/context.rs

@@ -99,17 +99,17 @@ 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 +121,8 @@ 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 +146,21 @@ 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>, ()>;

compiler/rustc_middle/src/ty/predicate.rs

@@ -1,21 +1,25 @@
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::intern::Interned;
-use rustc_errors::{DiagArgValue, IntoDiagArg};
 use rustc_hir::def_id::DefId;
 use rustc_macros::{HashStable, Lift, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
 use rustc_type_ir::ClauseKind as IrClauseKind;
 use rustc_type_ir::PredicateKind as IrPredicateKind;
 use rustc_type_ir::TraitPredicate as IrTraitPredicate;
 use rustc_type_ir::TraitRef as IrTraitRef;
+use rustc_type_ir::ProjectionPredicate as IrProjectionPredicate;
+use rustc_type_ir::ExistentialTraitRef as IrExistentialTraitRef;
+use rustc_type_ir::ExistentialProjection as IrExistentialProjection;
 use std::cmp::Ordering;
 
-use crate::ty::visit::TypeVisitableExt;
 use crate::ty::{
-    self, AliasTy, Binder, DebruijnIndex, DebugWithInfcx, EarlyBinder, GenericArgsRef,
+    self, AliasTy, Binder, DebruijnIndex, DebugWithInfcx, EarlyBinder,
     PredicatePolarity, Term, Ty, TyCtxt, TypeFlags, WithCachedTypeInfo,
 };
 
 pub type TraitRef<'tcx> = IrTraitRef<TyCtxt<'tcx>>;
+pub type ProjectionPredicate<'tcx> = IrProjectionPredicate<TyCtxt<'tcx>>;
+pub type ExistentialTraitRef<'tcx> = IrExistentialTraitRef<TyCtxt<'tcx>>;
+pub type ExistentialProjection<'tcx> = IrExistentialProjection<TyCtxt<'tcx>>;
 pub type TraitPredicate<'tcx> = IrTraitPredicate<TyCtxt<'tcx>>;
 pub type ClauseKind<'tcx> = IrClauseKind<TyCtxt<'tcx>>;
 pub type PredicateKind<'tcx> = IrPredicateKind<TyCtxt<'tcx>>;
@@ -342,52 +346,6 @@ impl<'tcx> PolyTraitRef<'tcx> {
     }
 }
 
-/// An existential reference to a trait, where `Self` is erased.
-/// For example, the trait object `Trait<'a, 'b, X, Y>` is:
-/// ```ignore (illustrative)
-/// exists T. T: Trait<'a, 'b, X, Y>
-/// ```
-/// The generic parameters don't include the erased `Self`, only trait
-/// type and lifetime parameters (`[X, Y]` and `['a, 'b]` above).
-#[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-pub struct ExistentialTraitRef<'tcx> {
-    pub def_id: DefId,
-    pub args: GenericArgsRef<'tcx>,
-}
-
-impl<'tcx> ExistentialTraitRef<'tcx> {
-    pub fn erase_self_ty(
-        tcx: TyCtxt<'tcx>,
-        trait_ref: ty::TraitRef<'tcx>,
-    ) -> ty::ExistentialTraitRef<'tcx> {
-        // Assert there is a Self.
-        trait_ref.args.type_at(0);
-
-        ty::ExistentialTraitRef {
-            def_id: trait_ref.def_id,
-            args: tcx.mk_args(&trait_ref.args[1..]),
-        }
-    }
-
-    /// Object types don't have a self type specified. Therefore, when
-    /// we convert the principal trait-ref into a normal trait-ref,
-    /// you must give *some* self type. A common choice is `mk_err()`
-    /// or some placeholder type.
-    pub fn with_self_ty(&self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ty::TraitRef<'tcx> {
-        // otherwise the escaping vars would be captured by the binder
-        // debug_assert!(!self_ty.has_escaping_bound_vars());
-
-        ty::TraitRef::new(tcx, self.def_id, [self_ty.into()].into_iter().chain(self.args.iter()))
-    }
-}
-
-impl<'tcx> IntoDiagArg for ExistentialTraitRef<'tcx> {
-    fn into_diag_arg(self) -> DiagArgValue {
-        self.to_string().into_diag_arg()
-    }
-}
-
 pub type PolyExistentialTraitRef<'tcx> = ty::Binder<'tcx, ExistentialTraitRef<'tcx>>;
 
 impl<'tcx> PolyExistentialTraitRef<'tcx> {
@@ -404,62 +362,8 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
     }
 }
 
-/// A `ProjectionPredicate` for an `ExistentialTraitRef`.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-pub struct ExistentialProjection<'tcx> {
-    pub def_id: DefId,
-    pub args: GenericArgsRef<'tcx>,
-    pub term: Term<'tcx>,
-}
-
 pub type PolyExistentialProjection<'tcx> = ty::Binder<'tcx, ExistentialProjection<'tcx>>;
 
-impl<'tcx> ExistentialProjection<'tcx> {
-    /// Extracts the underlying existential trait reference from this projection.
-    /// For example, if this is a projection of `exists T. <T as Iterator>::Item == X`,
-    /// then this function would return an `exists T. T: Iterator` existential trait
-    /// reference.
-    pub fn trait_ref(&self, tcx: TyCtxt<'tcx>) -> ty::ExistentialTraitRef<'tcx> {
-        let def_id = tcx.parent(self.def_id);
-        let args_count = tcx.generics_of(def_id).count() - 1;
-        let args = tcx.mk_args(&self.args[..args_count]);
-        ty::ExistentialTraitRef { def_id, args }
-    }
-
-    pub fn with_self_ty(
-        &self,
-        tcx: TyCtxt<'tcx>,
-        self_ty: Ty<'tcx>,
-    ) -> ty::ProjectionPredicate<'tcx> {
-        // otherwise the escaping regions would be captured by the binders
-        debug_assert!(!self_ty.has_escaping_bound_vars());
-
-        ty::ProjectionPredicate {
-            projection_ty: AliasTy::new(
-                tcx,
-                self.def_id,
-                [self_ty.into()].into_iter().chain(self.args),
-            ),
-            term: self.term,
-        }
-    }
-
-    pub fn erase_self_ty(
-        tcx: TyCtxt<'tcx>,
-        projection_predicate: ty::ProjectionPredicate<'tcx>,
-    ) -> Self {
-        // Assert there is a Self.
-        projection_predicate.projection_ty.args.type_at(0);
-
-        Self {
-            def_id: projection_predicate.projection_ty.def_id,
-            args: tcx.mk_args(&projection_predicate.projection_ty.args[1..]),
-            term: projection_predicate.term,
-        }
-    }
-}
-
 impl<'tcx> PolyExistentialProjection<'tcx> {
     pub fn with_self_ty(
         &self,
@@ -628,43 +532,6 @@ pub struct CoercePredicate<'tcx> {
 }
 pub type PolyCoercePredicate<'tcx> = ty::Binder<'tcx, CoercePredicate<'tcx>>;
 
-/// This kind of predicate has no *direct* correspondent in the
-/// syntax, but it roughly corresponds to the syntactic forms:
-///
-/// 1. `T: TraitRef<..., Item = Type>`
-/// 2. `<T as TraitRef<...>>::Item == Type` (NYI)
-///
-/// In particular, form #1 is "desugared" to the combination of a
-/// normal trait predicate (`T: TraitRef<...>`) and one of these
-/// predicates. Form #2 is a broader form in that it also permits
-/// equality between arbitrary types. Processing an instance of
-/// Form #2 eventually yields one of these `ProjectionPredicate`
-/// instances to normalize the LHS.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-pub struct ProjectionPredicate<'tcx> {
-    pub projection_ty: AliasTy<'tcx>,
-    pub term: Term<'tcx>,
-}
-
-impl<'tcx> ProjectionPredicate<'tcx> {
-    pub fn self_ty(self) -> Ty<'tcx> {
-        self.projection_ty.self_ty()
-    }
-
-    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ProjectionPredicate<'tcx> {
-        Self { projection_ty: self.projection_ty.with_self_ty(tcx, self_ty), ..self }
-    }
-
-    pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId {
-        self.projection_ty.trait_def_id(tcx)
-    }
-
-    pub fn def_id(self) -> DefId {
-        self.projection_ty.def_id
-    }
-}
-
 pub type PolyProjectionPredicate<'tcx> = Binder<'tcx, ProjectionPredicate<'tcx>>;
 
 impl<'tcx> PolyProjectionPredicate<'tcx> {

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

@@ -3087,14 +3087,6 @@ define_print! {
             ty::PredicateKind::AliasRelate(t1, t2, dir) => p!(print(t1), write(" {} ", dir), print(t2)),
         }
     }
-}
-
-define_print_and_forward_display! {
-    (self, cx):
-
-    &'tcx ty::List<Ty<'tcx>> {
-        p!("{{", comma_sep(self.iter()), "}}")
-    }
 
     ty::ExistentialTraitRef<'tcx> {
         // Use a type that can't appear in defaults of type parameters.
@@ -3108,6 +3100,20 @@ define_print_and_forward_display! {
         p!(write("{} = ", name), print(self.term))
     }
 
+    ty::ProjectionPredicate<'tcx> {
+        p!(print(self.projection_ty), " == ");
+        cx.reset_type_limit();
+        p!(print(self.term))
+    }
+}
+
+define_print_and_forward_display! {
+    (self, cx):
+
+    &'tcx ty::List<Ty<'tcx>> {
+        p!("{{", comma_sep(self.iter()), "}}")
+    }
+
     ty::ExistentialPredicate<'tcx> {
         match *self {
             ty::ExistentialPredicate::Trait(x) => p!(print(x)),
@@ -3186,12 +3192,6 @@ define_print_and_forward_display! {
         p!(print(self.b))
     }
 
-    ty::ProjectionPredicate<'tcx> {
-        p!(print(self.projection_ty), " == ");
-        cx.reset_type_limit();
-        p!(print(self.term))
-    }
-
     ty::NormalizesTo<'tcx> {
         p!(print(self.alias), " normalizes-to ");
         cx.reset_type_limit();

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -55,12 +55,6 @@ impl fmt::Debug for ty::UpvarId {
     }
 }
 
-impl<'tcx> fmt::Debug for ty::ExistentialTraitRef<'tcx> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        with_no_trimmed_paths!(fmt::Display::fmt(self, f))
-    }
-}
-
 impl<'tcx> fmt::Debug for ty::adjustment::Adjustment<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{:?} -> {}", self.kind, self.target)
@@ -158,12 +152,6 @@ impl fmt::Debug for ty::ParamConst {
     }
 }
 
-impl<'tcx> fmt::Debug for ty::ProjectionPredicate<'tcx> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "ProjectionPredicate({:?}, {:?})", self.projection_ty, self.term)
-    }
-}
-
 impl<'tcx> fmt::Debug for ty::NormalizesTo<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "NormalizesTo({:?}, {:?})", self.alias, self.term)

compiler/rustc_middle/src/ty/sty.rs

@@ -1142,6 +1142,36 @@ pub struct AliasTy<'tcx> {
     _use_alias_ty_new_instead: (),
 }
 
+impl<'tcx> rustc_type_ir::inherent::AliasTy<TyCtxt<'tcx>> for AliasTy<'tcx> {
+    fn new(
+        interner: TyCtxt<'tcx>,
+        trait_def_id: DefId,
+        args: impl IntoIterator<Item: Into<ty::GenericArg<'tcx>>>,
+    ) -> Self {
+        AliasTy::new(interner, trait_def_id, args)
+    }
+
+    fn def_id(self) -> DefId {
+        self.def_id
+    }
+
+    fn args(self) -> ty::GenericArgsRef<'tcx> {
+        self.args
+    }
+
+    fn trait_def_id(self, interner: TyCtxt<'tcx>) -> DefId {
+        self.trait_def_id(interner)
+    }
+
+    fn self_ty(self) -> Ty<'tcx> {
+        self.self_ty()
+    }
+
+    fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
+        self.with_self_ty(tcx, self_ty)
+    }
+}
+
 impl<'tcx> AliasTy<'tcx> {
     pub fn new(
         tcx: TyCtxt<'tcx>,