SolochainDefaultConfig: Use correct AccountData

prdoc/pr_5941.prdoc

@@ -0,0 +1,16 @@
+title: "`SolochainDefaultConfig`: Use correct `AccountData`"
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      `SolochainDefaultConfig` by default was setting `AccountData` to `AccountInfo`.
+      Thus, the actual account data was recursively nested the same type. By default
+      it should be set `()`, because this is the only reasonable `AccountData`. 
+
+      If you have used `SolochainDefaultConfig` before and did not overwrite, `AccountData`
+      you should now overwrite it to `AccountInfo` or you will need to write a migration to
+      change the data.
+
+crates:
+  - name: frame-system
+    bump: patch

substrate/frame/system/src/lib.rs

@@ -364,7 +364,7 @@ pub mod pallet {
 			type MaxConsumers = frame_support::traits::ConstU32<128>;
 
 			/// The default data to be stored in an account.
-			type AccountData = crate::AccountInfo<Self::Nonce, ()>;
+			type AccountData = ();
 
 			/// What to do if a new account is created.
 			type OnNewAccount = ();