diff --git a/engine/lib/ast.ml b/engine/lib/ast.ml
index 82c5fb119..10cc44808 100644
--- a/engine/lib/ast.ml
+++ b/engine/lib/ast.ml
@@ -145,9 +145,6 @@ functor
       | ImplApp of { impl : impl_expr; args : impl_expr list }
       | Dyn
       | Builtin of trait_goal
-      | FnPointer of ty
-      (* The `IE` suffix is there because visitors conflicts...... *)
-      | ClosureIE of todo
 
     and trait_goal = { trait : concrete_ident; args : generic_value list }
     (** A fully applied trait: [Foo<SomeTy, T0, ..., Tn>] (or
diff --git a/engine/lib/ast_visitors.ml b/engine/lib/ast_visitors.ml
index dcf12c9a1..1f9ce20f7 100644
--- a/engine/lib/ast_visitors.ml
+++ b/engine/lib/ast_visitors.ml
@@ -176,12 +176,6 @@ functor
           | Builtin x0 ->
               let x0 = self#visit_trait_goal env x0 in
               Builtin x0
-          | FnPointer x0 ->
-              let x0 = self#visit_ty env x0 in
-              FnPointer x0
-          | ClosureIE x0 ->
-              let x0 = self#visit_todo env x0 in
-              ClosureIE x0
 
         method visit_trait_goal (env : 'env) (this : trait_goal) : trait_goal =
           let trait = self#visit_concrete_ident env this.trait in
@@ -1115,12 +1109,6 @@ functor
           | Builtin x0 ->
               let x0, reduce_acc = self#visit_trait_goal env x0 in
               (Builtin x0, reduce_acc)
-          | FnPointer x0 ->
-              let x0, reduce_acc = self#visit_ty env x0 in
-              (FnPointer x0, reduce_acc)
-          | ClosureIE x0 ->
-              let x0, reduce_acc = self#visit_todo env x0 in
-              (ClosureIE x0, reduce_acc)
 
         method visit_trait_goal (env : 'env) (this : trait_goal)
             : trait_goal * 'acc =
@@ -2301,12 +2289,6 @@ functor
           | Builtin x0 ->
               let reduce_acc = self#visit_trait_goal env x0 in
               reduce_acc
-          | FnPointer x0 ->
-              let reduce_acc = self#visit_ty env x0 in
-              reduce_acc
-          | ClosureIE x0 ->
-              let reduce_acc = self#visit_todo env x0 in
-              reduce_acc
 
         method visit_trait_goal (env : 'env) (this : trait_goal) : 'acc =
           let reduce_acc = self#visit_concrete_ident env this.trait in
diff --git a/engine/lib/import_thir.ml b/engine/lib/import_thir.ml
index 95b73ccf3..2a515162b 100644
--- a/engine/lib/import_thir.ml
+++ b/engine/lib/import_thir.ml
@@ -991,8 +991,6 @@ end) : EXPR = struct
     | Dyn -> Dyn
     | SelfImpl { path; _ } -> List.fold ~init:Self ~f:browse_path path
     | Builtin { trait } -> Builtin (c_trait_ref span trait)
-    | FnPointer { fn_ty } -> FnPointer (c_ty span fn_ty)
-    | Closure _ as x -> ClosureIE ([%show: Thir.impl_expr_atom] x)
     | Todo str -> failwith @@ "impl_expr_atom: Todo " ^ str
 
   and c_generic_value (span : Thir.span) (ty : Thir.generic_arg) : generic_value
diff --git a/engine/lib/subtype.ml b/engine/lib/subtype.ml
index 835861fda..76c2db4b9 100644
--- a/engine/lib/subtype.ml
+++ b/engine/lib/subtype.ml
@@ -72,8 +72,6 @@ struct
           }
     | Dyn -> Dyn
     | Builtin tr -> Builtin (dtrait_goal span tr)
-    | ClosureIE todo -> ClosureIE todo
-    | FnPointer ty -> FnPointer (dty span ty)
 
   and dgeneric_value (span : span) (generic_value : A.generic_value) :
       B.generic_value =
diff --git a/frontend/exporter/src/traits.rs b/frontend/exporter/src/traits.rs
index b1e7ce4d8..bc6ac4b71 100644
--- a/frontend/exporter/src/traits.rs
+++ b/frontend/exporter/src/traits.rs
@@ -50,17 +50,6 @@ pub enum ImplExprAtom {
     Dyn,
     /// A built-in trait whose implementation is computed by the compiler, such as `Sync`.
     Builtin { r#trait: TraitRef },
-    /// Function pointer types (e.g. `fn(bool, u32) -> u32`) automaticlaly implement some traits
-    /// such as `Copy` and the appropriate `Fn` traits.
-    /// FIXME: currently unused because rustc no longer identifies those explicitly.
-    FnPointer { fn_ty: Box<Ty> },
-    /// Closures automatically implement the appropriate `Fn` traits.
-    /// FIXME: currently unused because rustc no longer identifies those explicitly.
-    Closure {
-        closure_def_id: DefId,
-        parent_substs: Vec<GenericArg>,
-        signature: Box<PolyFnSig>,
-    },
     /// Anything else. Currently used for trait upcasting and trait aliases.
     Todo(String),
 }