Comment update

Author: oli-obk

compiler/rustc_lint/src/types.rs

@@ -703,8 +703,7 @@ fn ty_is_known_nonnull<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, mode: CItemKi
                 return true;
             }
 
-            // Types with a `#[repr(no_niche)]` attribute have their niche hidden.
-            // The attribute is used by the UnsafeCell for example (the only use so far).
+            // `UnsafeCell` has its niche hidden.
             if def.is_unsafe_cell() {
                 return false;
             }