Remove ImplSubject

compiler/rustc_infer/src/infer/at.rs

@@ -28,7 +28,7 @@
 use relate::lattice::{LatticeOp, LatticeOpKind};
 use rustc_middle::bug;
 use rustc_middle::ty::relate::solver_relating::RelateExt as NextSolverRelate;
-use rustc_middle::ty::{Const, ImplSubject, TypingMode};
+use rustc_middle::ty::{Const, TypingMode};
 
 use super::*;
 use crate::infer::relate::type_relating::TypeRelating;
@@ -304,23 +304,6 @@ impl<'a, 'tcx> At<'a, 'tcx> {
     }
 }
 
-impl<'tcx> ToTrace<'tcx> for ImplSubject<'tcx> {
-    fn to_trace(cause: &ObligationCause<'tcx>, a: Self, b: Self) -> TypeTrace<'tcx> {
-        match (a, b) {
-            (ImplSubject::Trait(trait_ref_a), ImplSubject::Trait(trait_ref_b)) => {
-                ToTrace::to_trace(cause, trait_ref_a, trait_ref_b)
-            }
-            (ImplSubject::Inherent(ty_a), ImplSubject::Inherent(ty_b)) => {
-                ToTrace::to_trace(cause, ty_a, ty_b)
-            }
-            (ImplSubject::Trait(_), ImplSubject::Inherent(_))
-            | (ImplSubject::Inherent(_), ImplSubject::Trait(_)) => {
-                bug!("can not trace TraitRef and Ty");
-            }
-        }
-    }
-}
-
 impl<'tcx> ToTrace<'tcx> for Ty<'tcx> {
     fn to_trace(cause: &ObligationCause<'tcx>, a: Self, b: Self) -> TypeTrace<'tcx> {
         TypeTrace {

compiler/rustc_middle/src/hir/mod.rs

@@ -18,7 +18,7 @@ use rustc_macros::{Decodable, Encodable, HashStable};
 use rustc_span::{ErrorGuaranteed, ExpnId, Span};
 
 use crate::query::Providers;
-use crate::ty::{EarlyBinder, ImplSubject, TyCtxt};
+use crate::ty::TyCtxt;
 
 /// Gather the LocalDefId for each item-like within a module, including items contained within
 /// bodies. The Ids are in visitor order. This is used to partition a pass between modules.
@@ -154,13 +154,6 @@ impl<'tcx> TyCtxt<'tcx> {
         LocalModDefId::new_unchecked(id)
     }
 
-    pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<'tcx, ImplSubject<'tcx>> {
-        match self.impl_trait_ref(def_id) {
-            Some(t) => t.map_bound(ImplSubject::Trait),
-            None => self.type_of(def_id).map_bound(ImplSubject::Inherent),
-        }
-    }
-
     /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
     pub fn is_foreign_item(self, def_id: impl Into<DefId>) -> bool {
         self.opt_parent(def_id.into())

compiler/rustc_middle/src/ty/mod.rs

@@ -254,12 +254,6 @@ pub struct ImplTraitHeader<'tcx> {
     pub constness: hir::Constness,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Debug, TypeFoldable, TypeVisitable)]
-pub enum ImplSubject<'tcx> {
-    Trait(TraitRef<'tcx>),
-    Inherent(Ty<'tcx>),
-}
-
 #[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable, Debug)]
 #[derive(TypeFoldable, TypeVisitable)]
 pub enum Asyncness {

compiler/rustc_middle/src/ty/relate.rs

@@ -7,30 +7,6 @@ use crate::ty::{self as ty, Ty, TyCtxt};
 
 pub type RelateResult<'tcx, T> = rustc_type_ir::relate::RelateResult<TyCtxt<'tcx>, T>;
 
-impl<'tcx> Relate<TyCtxt<'tcx>> for ty::ImplSubject<'tcx> {
-    #[inline]
-    fn relate<R: TypeRelation<TyCtxt<'tcx>>>(
-        relation: &mut R,
-        a: ty::ImplSubject<'tcx>,
-        b: ty::ImplSubject<'tcx>,
-    ) -> RelateResult<'tcx, ty::ImplSubject<'tcx>> {
-        match (a, b) {
-            (ty::ImplSubject::Trait(trait_ref_a), ty::ImplSubject::Trait(trait_ref_b)) => {
-                let trait_ref = ty::TraitRef::relate(relation, trait_ref_a, trait_ref_b)?;
-                Ok(ty::ImplSubject::Trait(trait_ref))
-            }
-            (ty::ImplSubject::Inherent(ty_a), ty::ImplSubject::Inherent(ty_b)) => {
-                let ty = Ty::relate(relation, ty_a, ty_b)?;
-                Ok(ty::ImplSubject::Inherent(ty))
-            }
-            (ty::ImplSubject::Trait(_), ty::ImplSubject::Inherent(_))
-            | (ty::ImplSubject::Inherent(_), ty::ImplSubject::Trait(_)) => {
-                bug!("can not relate TraitRef and Ty");
-            }
-        }
-    }
-}
-
 impl<'tcx> Relate<TyCtxt<'tcx>> for Ty<'tcx> {
     #[inline]
     fn relate<R: TypeRelation<TyCtxt<'tcx>>>(

src/librustdoc/html/render/mod.rs

@@ -2454,11 +2454,11 @@ fn get_id_for_impl(tcx: TyCtxt<'_>, impl_id: ItemId) -> String {
             (ty, Some(ty::TraitRef::new(tcx, trait_, [ty])))
         }
         ItemId::Blanket { impl_id, .. } | ItemId::DefId(impl_id) => {
-            match tcx.impl_subject(impl_id).skip_binder() {
-                ty::ImplSubject::Trait(trait_ref) => {
-                    (trait_ref.args[0].expect_ty(), Some(trait_ref))
-                }
-                ty::ImplSubject::Inherent(ty) => (ty, None),
+            if let Some(trait_ref) = tcx.impl_trait_ref(impl_id) {
+                let trait_ref = trait_ref.skip_binder();
+                (trait_ref.self_ty(), Some(trait_ref))
+            } else {
+                (tcx.type_of(impl_id).skip_binder(), None)
             }
         }
     };