🤦

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/support/src/storage/generator/double_map.rs

@@ -511,35 +511,13 @@ where
 mod test_iterators {
 	use crate::{
 		hash::StorageHasher,
-		pallet_prelude::ValueQuery,
 		storage::{
 			generator::{tests::*, StorageDoubleMap},
 			unhashed,
 		},
 	};
 	use codec::Encode;
 
-	#[test]
-	fn mutate_return_none_still_modifies() {
-		sp_io::TestExternalities::default().execute_with(|| {
-			use crate::hash::Identity;
-			#[crate::storage_alias]
-			type MyDoubleMap =
-				StorageDoubleMap<MyModule, Identity, u64, Identity, u64, u64, ValueQuery>;
-
-			// Insert one value
-			MyDoubleMap::insert(1, 1, 2);
-
-			MyDoubleMap::try_mutate(1, 1, |v| {
-				assert_eq!(*v, 2);
-				*v = 3;
-				Err::<u64, ()>(())
-			});
-
-			assert_eq!(MyDoubleMap::get(1, 1), 2);
-		});
-	}
-
 	#[test]
 	fn double_map_iter_from() {
 		sp_io::TestExternalities::default().execute_with(|| {