diff --git a/compiler/rustc_middle/src/ty/closure.rs b/compiler/rustc_middle/src/ty/closure.rs
index e0bd4909810..286946d1d1f 100644
--- a/compiler/rustc_middle/src/ty/closure.rs
+++ b/compiler/rustc_middle/src/ty/closure.rs
@@ -100,19 +100,9 @@ impl<'tcx> ClosureKind {
         self <= other
     }
 
-    /// Returns the representative scalar type for this closure kind.
-    /// See `Ty::to_opt_closure_kind` for more details.
-    pub fn to_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
-        match self {
-            ClosureKind::Fn => tcx.types.i8,
-            ClosureKind::FnMut => tcx.types.i16,
-            ClosureKind::FnOnce => tcx.types.i32,
-        }
-    }
-
     /// Converts `self` to a [`DefId`] of the corresponding trait.
     ///
-    /// Note: the inverse of this function is [`TyCtxt::fn_trait_kind_from_def_id`]
+    /// Note: the inverse of this function is [`TyCtxt::fn_trait_kind_from_def_id`].
     pub fn to_def_id(&self, tcx: TyCtxt<'_>) -> DefId {
         tcx.require_lang_item(
             match self {
@@ -123,6 +113,16 @@ impl<'tcx> ClosureKind {
             None,
         )
     }
+
+    /// Returns the representative scalar type for this closure kind.
+    /// See `Ty::to_opt_closure_kind` for more details.
+    pub fn to_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
+        match self {
+            ClosureKind::Fn => tcx.types.i8,
+            ClosureKind::FnMut => tcx.types.i16,
+            ClosureKind::FnOnce => tcx.types.i32,
+        }
+    }
 }
 
 /// A composite describing a `Place` that is captured by a closure.
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index a53b275fb02..4fc97c0baaf 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -2114,8 +2114,7 @@ impl<'tcx> Ty<'tcx> {
     /// parameter. This is kind of a phantom type, except that the
     /// most convenient thing for us to are the integral types. This
     /// function converts such a special type into the closure
-    /// kind. To go the other way, use
-    /// `tcx.closure_kind_ty(closure_kind)`.
+    /// kind. To go the other way, use `closure_kind.to_ty(tcx)`.
     ///
     /// Note that during type checking, we use an inference variable
     /// to represent the closure kind, because it has not yet been