From 4c84f8748e5395852a9e0e25b0404953fee1a59e Mon Sep 17 00:00:00 2001
From: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Date: Thu, 22 Dec 2022 18:16:41 +0100
Subject: [PATCH] WIP

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
---
 .../storage_pov_estimate_as_generic.rs        | 19 +++++++++++++++++++
 .../storage_pov_estimate_as_generic.stderr    |  5 +++++
 2 files changed, 24 insertions(+)
 create mode 100644 frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.rs
 create mode 100644 frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.stderr

diff --git a/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.rs b/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.rs
new file mode 100644
index 0000000000000..ed31b0590bd3b
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.rs
@@ -0,0 +1,19 @@
+#[frame_support::pallet]
+mod pallet {
+	use frame_support::pallet_prelude::*;
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {}
+
+	#[pallet::pallet]
+	pub struct Pallet<T>(_);
+
+	#[pallet::error]
+	pub enum Error<T> {}
+
+	#[pallet::storage]
+	type Foo<T: Config> = StorageValue<Value = u8, ProofSize = frame_support::storage::MeasuredProofSize>;
+}
+
+fn main() {
+}
diff --git a/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.stderr b/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.stderr
new file mode 100644
index 0000000000000..a649edc848e39
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/storage_pov_estimate_as_generic.stderr
@@ -0,0 +1,5 @@
+error: Invalid pallet::storage, Unexpected generic `ProofSize` for `StorageValue`. `StorageValue` expect generics `Value`, and optional generics `QueryKind`, `OnEmpty`.
+  --> tests/pallet_ui/storage_pov_estimate_as_generic.rs:15:49
+   |
+15 |     type Foo<T: Config> = StorageValue<Value = u8, ProofSize = frame_support::storage::MeasuredProofSize>;
+   |                                                    ^^^^^^^^^