diff --git a/chalk-integration/src/lowering.rs b/chalk-integration/src/lowering.rs
index b87dacb8679..424bdd9f3ea 100644
--- a/chalk-integration/src/lowering.rs
+++ b/chalk-integration/src/lowering.rs
@@ -1818,10 +1818,10 @@ trait LowerWellKnownTrait {
 impl LowerWellKnownTrait for WellKnownTrait {
     fn lower(&self) -> rust_ir::WellKnownTrait {
         match self {
-            Self::SizedTrait => rust_ir::WellKnownTrait::SizedTrait,
-            Self::CopyTrait => rust_ir::WellKnownTrait::CopyTrait,
-            Self::CloneTrait => rust_ir::WellKnownTrait::CloneTrait,
-            Self::DropTrait => rust_ir::WellKnownTrait::DropTrait,
+            Self::Sized => rust_ir::WellKnownTrait::Sized,
+            Self::Copy => rust_ir::WellKnownTrait::Copy,
+            Self::Clone => rust_ir::WellKnownTrait::Clone,
+            Self::Drop => rust_ir::WellKnownTrait::Drop,
         }
     }
 }
diff --git a/chalk-parse/src/ast.rs b/chalk-parse/src/ast.rs
index 7925f664a58..c806b7a1f1e 100644
--- a/chalk-parse/src/ast.rs
+++ b/chalk-parse/src/ast.rs
@@ -64,10 +64,10 @@ pub struct TraitDefn {
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum WellKnownTrait {
-    SizedTrait,
-    CopyTrait,
-    CloneTrait,
-    DropTrait,
+    Sized,
+    Copy,
+    Clone,
+    Drop,
 }
 
 #[derive(Clone, PartialEq, Eq, Debug)]
diff --git a/chalk-parse/src/parser.lalrpop b/chalk-parse/src/parser.lalrpop
index 531a8a3f778..944f4733261 100644
--- a/chalk-parse/src/parser.lalrpop
+++ b/chalk-parse/src/parser.lalrpop
@@ -47,10 +47,10 @@ CoinductiveKeyword: () = "#" "[" "coinductive" "]";
 ObjectSafeKeyword: () = "#" "[" "object_safe" "]";
 
 WellKnownTrait: WellKnownTrait = {
-     "#" "[" "lang" "(" "sized" ")" "]" => WellKnownTrait::SizedTrait,
-     "#" "[" "lang" "(" "copy" ")" "]" => WellKnownTrait::CopyTrait,
-     "#" "[" "lang" "(" "clone" ")" "]" => WellKnownTrait::CloneTrait,
-     "#" "[" "lang" "(" "drop" ")" "]" => WellKnownTrait::DropTrait,
+     "#" "[" "lang" "(" "sized" ")" "]" => WellKnownTrait::Sized,
+     "#" "[" "lang" "(" "copy" ")" "]" => WellKnownTrait::Copy,
+     "#" "[" "lang" "(" "clone" ")" "]" => WellKnownTrait::Clone,
+     "#" "[" "lang" "(" "drop" ")" "]" => WellKnownTrait::Drop,
 };
 
 StructDefn: StructDefn = {
diff --git a/chalk-solve/src/clauses/builtin_traits.rs b/chalk-solve/src/clauses/builtin_traits.rs
index cb9eac50b11..3a6fa7f7514 100644
--- a/chalk-solve/src/clauses/builtin_traits.rs
+++ b/chalk-solve/src/clauses/builtin_traits.rs
@@ -29,17 +29,11 @@ pub fn add_builtin_program_clauses<I: Interner>(
         }
 
         match well_known {
-            WellKnownTrait::SizedTrait => {
-                sized::add_sized_program_clauses(db, builder, &trait_ref, ty)
-            }
-            WellKnownTrait::CopyTrait => {
-                copy::add_copy_program_clauses(db, builder, &trait_ref, ty)
-            }
-            WellKnownTrait::CloneTrait => {
-                clone::add_clone_program_clauses(db, builder, &trait_ref, ty)
-            }
+            WellKnownTrait::Sized => sized::add_sized_program_clauses(db, builder, &trait_ref, ty),
+            WellKnownTrait::Copy => copy::add_copy_program_clauses(db, builder, &trait_ref, ty),
+            WellKnownTrait::Clone => clone::add_clone_program_clauses(db, builder, &trait_ref, ty),
             // Drop impls are provided explicitly
-            WellKnownTrait::DropTrait => (),
+            WellKnownTrait::Drop => (),
         }
     });
 }
diff --git a/chalk-solve/src/clauses/program_clauses.rs b/chalk-solve/src/clauses/program_clauses.rs
index 800f3a8fc94..47f19126820 100644
--- a/chalk-solve/src/clauses/program_clauses.rs
+++ b/chalk-solve/src/clauses/program_clauses.rs
@@ -602,7 +602,7 @@ impl<I: Interner> ToProgramClauses<I> for TraitDatum<I> {
             // i.e. Drop implementation for `struct S<T: Eq> {}` is forced to be
             // `impl Drop<T: Eq> for S<T> { ... }`. That means that orphan rules
             // prevent Drop from being implemented in downstream crates.
-            if self.well_known != Some(WellKnownTrait::DropTrait) {
+            if self.well_known != Some(WellKnownTrait::Drop) {
                 // Add all cases for potential downstream impls that could exist
                 for i in 0..type_parameters.len() {
                     builder.push_clause(
diff --git a/chalk-solve/src/rust_ir.rs b/chalk-solve/src/rust_ir.rs
index 4d28d1aad31..d0c57919e52 100644
--- a/chalk-solve/src/rust_ir.rs
+++ b/chalk-solve/src/rust_ir.rs
@@ -212,10 +212,10 @@ pub struct TraitDatum<I: Interner> {
 /// the chalk-solve crate has special, hard-coded impls for them.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Ord, PartialOrd, Hash)]
 pub enum WellKnownTrait {
-    SizedTrait,
-    CopyTrait,
-    CloneTrait,
-    DropTrait,
+    Sized,
+    Copy,
+    Clone,
+    Drop,
 }
 
 impl<I: Interner> TraitDatum<I> {
diff --git a/chalk-solve/src/wf.rs b/chalk-solve/src/wf.rs
index 2bb64a3f617..a6a97d32a4b 100644
--- a/chalk-solve/src/wf.rs
+++ b/chalk-solve/src/wf.rs
@@ -470,10 +470,8 @@ impl WfWellKnownGoals {
         trait_ref: &TraitRef<I>,
     ) -> Option<Goal<I>> {
         match db.trait_datum(trait_ref.trait_id).well_known? {
-            WellKnownTrait::CopyTrait => Self::copy_impl_constraint(db, trait_ref),
-            WellKnownTrait::DropTrait | WellKnownTrait::CloneTrait | WellKnownTrait::SizedTrait => {
-                None
-            }
+            WellKnownTrait::Copy => Self::copy_impl_constraint(db, trait_ref),
+            WellKnownTrait::Drop | WellKnownTrait::Clone | WellKnownTrait::Sized => None,
         }
     }
 
@@ -488,9 +486,9 @@ impl WfWellKnownGoals {
 
         match db.trait_datum(impl_datum.trait_id()).well_known? {
             // You can't add a manual implementation of Sized
-            WellKnownTrait::SizedTrait => Some(GoalData::CannotProve(()).intern(interner)),
-            WellKnownTrait::DropTrait => Self::drop_impl_constraint(db, impl_datum),
-            WellKnownTrait::CopyTrait | WellKnownTrait::CloneTrait => None,
+            WellKnownTrait::Sized => Some(GoalData::CannotProve(()).intern(interner)),
+            WellKnownTrait::Drop => Self::drop_impl_constraint(db, impl_datum),
+            WellKnownTrait::Copy | WellKnownTrait::Clone => None,
         }
     }
 
@@ -507,7 +505,7 @@ impl WfWellKnownGoals {
 
         let interner = db.interner();
 
-        let sized_trait = db.well_known_trait_id(WellKnownTrait::SizedTrait)?;
+        let sized_trait = db.well_known_trait_id(WellKnownTrait::Sized)?;
 
         Some(Goal::all(
             interner,
@@ -547,16 +545,16 @@ impl WfWellKnownGoals {
         };
 
         // not { Implemented(ImplSelfTy: Drop) }
-        let neg_drop_goal =
-            db.well_known_trait_id(WellKnownTrait::DropTrait)
-                .map(|drop_trait_id| {
-                    TraitRef {
-                        trait_id: drop_trait_id,
-                        substitution: Substitution::from1(interner, ty.clone()),
-                    }
-                    .cast::<Goal<I>>(interner)
-                    .negate(interner)
-                });
+        let neg_drop_goal = db
+            .well_known_trait_id(WellKnownTrait::Drop)
+            .map(|drop_trait_id| {
+                TraitRef {
+                    trait_id: drop_trait_id,
+                    substitution: Substitution::from1(interner, ty.clone()),
+                }
+                .cast::<Goal<I>>(interner)
+                .negate(interner)
+            });
 
         let adt_datum = db.adt_datum(adt_id);