hooks default impl missing where clause (#13264)

* hooks default impl missing where clause

* add tests

* Update frame/support/test/tests/pallet_ui/pass/where_clause_missing_hooks.rs

---------

Co-authored-by: parity-processbot <>

substrate/frame/support/test/tests/pallet_ui/duplicate_store_attr.rs

@@ -22,5 +22,4 @@ mod pallet {
 	type Foo<T> = StorageValue<_, u8>;
 }
 
-fn main() {
-}
+fn main() {}

substrate/frame/support/test/tests/pallet_ui/pass/where_clause_missing_hooks.rs

@@ -0,0 +1,19 @@
+#[frame_support::pallet]
+mod pallet {
+	#[pallet::config]
+	pub trait Config: frame_system::Config where <Self as frame_system::Config>::Index: From<u128> {}
+
+	#[pallet::pallet]
+	pub struct Pallet<T>(core::marker::PhantomData<T>);
+
+	#[pallet::call]
+	impl<T: Config> Pallet<T> where <T as frame_system::Config>::Index: From<u128> {}
+
+	impl<T: Config> Pallet<T> where <T as frame_system::Config>::Index: From<u128> {
+		fn foo(x: u128) {
+			let _index = <T as frame_system::Config>::Index::from(x);
+		}
+	}
+}
+
+fn main() {}