Shut up clippy.

src/func/register.rs

@@ -47,9 +47,7 @@ pub fn by_value<T: Variant + Clone>(data: &mut Dynamic) -> T {
         // If T is `&str`, data must be `ImmutableString`, so map directly to it
         data.flatten_in_place();
         let ref_str = data.as_str_ref().expect("&str");
-        // # Safety
-        //
-        // We already checked that `T` is `&str`, so it is safe to cast here.
+        // SAFETY: We already checked that `T` is `&str`, so it is safe to cast here.
         return unsafe { mem::transmute_copy::<_, T>(&ref_str) };
     }
     if TypeId::of::<T>() == TypeId::of::<String>() {