Remove unsupported attribute

Author: samscott89

src/update.rs

@@ -494,7 +494,6 @@ fallback_impl! { compact_str::CompactString, }
 
 macro_rules! tuple_impl {
     ($($t:ident),*; $($u:ident),*) => {
-        #[diagnostic::do_not_recommend]
         unsafe impl<$($t),*> Update for ($($t,)*)
         where
             $($t: Update,)*

tests/compile-fail/tracked_fn_return_ref.stderr

@@ -50,14 +50,14 @@ error[E0277]: the trait bound `ContainsRef<'db>: Update` is not satisfied
    |      ^^^^^^^^^^^^^^^^ the trait `Update` is not implemented for `ContainsRef<'db>`
    |
    = help: the following other types implement trait `Update`:
-             Arc<T>
-             BTreeMap<K, V>
-             BTreeSet<K>
-             Box<T>
-             Box<[T]>
-             HashMap<K, V, S>
-             HashSet<K, S>
-             Infallible
+             ()
+             (A, B)
+             (A, B, C)
+             (A, B, C, D)
+             (A, B, C, D, E)
+             (A, B, C, D, E, F)
+             (A, B, C, D, E, F, G)
+             (A, B, C, D, E, F, G, H)
            and $N others
 note: required by a bound in `<tracked_fn_return_struct_containing_ref::Configuration_ as salsa::function::Configuration>::execute::_assert_return_type_is_update::_assert_is_update`
   --> tests/compile-fail/tracked_fn_return_ref.rs:19:1
@@ -73,14 +73,14 @@ error[E0277]: the trait bound `ContainsRef<'db>: Update` is not satisfied
    |      ^^^^^^^^^^^^^^^ the trait `Update` is not implemented for `ContainsRef<'db>`
    |
    = help: the following other types implement trait `Update`:
-             Arc<T>
-             BTreeMap<K, V>
-             BTreeSet<K>
-             Box<T>
-             Box<[T]>
-             HashMap<K, V, S>
-             HashSet<K, S>
-             Infallible
+             ()
+             (A, B)
+             (A, B, C)
+             (A, B, C, D)
+             (A, B, C, D, E)
+             (A, B, C, D, E, F)
+             (A, B, C, D, E, F, G)
+             (A, B, C, D, E, F, G, H)
            and $N others
 note: required by a bound in `<tracked_fn_return_struct_containing_ref_elided_explicit::Configuration_ as salsa::function::Configuration>::execute::_assert_return_type_is_update::_assert_is_update`
   --> tests/compile-fail/tracked_fn_return_ref.rs:39:1