diff --git a/frame/aura/src/lib.rs b/frame/aura/src/lib.rs
index db639a4499beb..77d6a6a643b49 100644
--- a/frame/aura/src/lib.rs
+++ b/frame/aura/src/lib.rs
@@ -66,7 +66,7 @@ pub mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(sp_std::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
diff --git a/frame/support/procedural/src/pallet/parse/pallet_struct.rs b/frame/support/procedural/src/pallet/parse/pallet_struct.rs
index 1c979741d9803..f7fcb69c0e650 100644
--- a/frame/support/procedural/src/pallet/parse/pallet_struct.rs
+++ b/frame/support/procedural/src/pallet/parse/pallet_struct.rs
@@ -97,6 +97,11 @@ impl PalletStructDef {
 			return Err(syn::Error::new(item.generics.where_clause.span(), msg));
 		}
 
+		if item.fields != syn::FieldsUnnamed::into(syn::parse_quote!((_))) {
+			let msg = "Invalid pallet::pallet, expected 1 unnamed field: `(_)`";
+			return Err(syn::Error::new(item.fields.span(), msg));
+		}
+
 		let mut instances = vec![];
 		instances.push(helper::check_type_def_gen_no_bounds(&item.generics, item.ident.span())?);
 
diff --git a/frame/support/src/lib.rs b/frame/support/src/lib.rs
index 8e4a635c2a481..ac4fc2c33e537 100644
--- a/frame/support/src/lib.rs
+++ b/frame/support/src/lib.rs
@@ -1786,7 +1786,7 @@ pub mod pallet_prelude {
 ///
 /// 	#[pallet::pallet]
 /// 	#[pallet::generate_store(pub(super) trait Store)]
-/// 	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
+/// 	pub struct Pallet<T, I = ()>(_);
 ///
 /// 	#[pallet::hooks]
 /// 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {
@@ -1922,7 +1922,7 @@ pub mod pallet_prelude {
 /// 		// NOTE: if the visibility of trait store is private but you want to make it available
 /// 		// in super, then use `pub(super)` or `pub(crate)` to make it available in crate.
 /// 		pub struct Pallet<T>(_);
-/// 		// pub struct Pallet<T, I = ()>(PhantomData<T>); // for instantiable pallet
+/// 		// pub struct Pallet<T, I = ()>(_); // for instantiable pallet
 /// 	}
 /// 	```
 /// 5. **migrate Config**: move trait into the module with
diff --git a/frame/support/test/tests/pallet_compatibility_instance.rs b/frame/support/test/tests/pallet_compatibility_instance.rs
index d7de03ea46cfd..d9f00704dcd91 100644
--- a/frame/support/test/tests/pallet_compatibility_instance.rs
+++ b/frame/support/test/tests/pallet_compatibility_instance.rs
@@ -96,7 +96,7 @@ pub mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
+	pub struct Pallet<T, I = ()>(_);
 
 	#[pallet::hooks]
 	impl<T: Config<I>, I: 'static> Hooks<T::BlockNumber> for Pallet<T, I> {
diff --git a/frame/support/test/tests/pallet_instance.rs b/frame/support/test/tests/pallet_instance.rs
index 62654d53e19d7..1751f41595381 100644
--- a/frame/support/test/tests/pallet_instance.rs
+++ b/frame/support/test/tests/pallet_instance.rs
@@ -44,7 +44,7 @@ pub mod pallet {
 
 	#[pallet::pallet]
 	#[pallet::generate_store(pub(crate) trait Store)]
-	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
+	pub struct Pallet<T, I = ()>(_);
 
 	#[pallet::hooks]
 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {
@@ -199,7 +199,7 @@ pub mod pallet2 {
 
 	#[pallet::pallet]
 	#[pallet::generate_store(pub(crate) trait Store)]
-	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
+	pub struct Pallet<T, I = ()>(_);
 
 	#[pallet::hooks]
 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {}
diff --git a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound.rs b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound.rs
index 69d35344d5761..96371bbbb2482 100644
--- a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound.rs
+++ b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound.rs
@@ -9,7 +9,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_2.rs b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_2.rs
index 581c72a4240a0..c631d4d4515ac 100644
--- a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_2.rs
+++ b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_2.rs
@@ -9,7 +9,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_3.rs b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_3.rs
index 97f362551037d..d228630b759e0 100644
--- a/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_3.rs
+++ b/frame/support/test/tests/pallet_ui/call_argument_invalid_bound_3.rs
@@ -8,7 +8,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_invalid_const.rs b/frame/support/test/tests/pallet_ui/call_invalid_const.rs
index 1a28bc32e65c6..32b01b808ceba 100644
--- a/frame/support/test/tests/pallet_ui/call_invalid_const.rs
+++ b/frame/support/test/tests/pallet_ui/call_invalid_const.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_invalid_origin_type.rs b/frame/support/test/tests/pallet_ui/call_invalid_origin_type.rs
index edf953b5976c0..bae99de29d5a7 100644
--- a/frame/support/test/tests/pallet_ui/call_invalid_origin_type.rs
+++ b/frame/support/test/tests/pallet_ui/call_invalid_origin_type.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_missing_weight.rs b/frame/support/test/tests/pallet_ui/call_missing_weight.rs
index 2ce607c53ac3a..f4c38c8250582 100644
--- a/frame/support/test/tests/pallet_ui/call_missing_weight.rs
+++ b/frame/support/test/tests/pallet_ui/call_missing_weight.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_no_origin.rs b/frame/support/test/tests/pallet_ui/call_no_origin.rs
index 83d10b6b08b4f..8e00fac3f9a60 100644
--- a/frame/support/test/tests/pallet_ui/call_no_origin.rs
+++ b/frame/support/test/tests/pallet_ui/call_no_origin.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/call_no_return.rs b/frame/support/test/tests/pallet_ui/call_no_return.rs
index a18c30f6d6d90..178ab2267a208 100644
--- a/frame/support/test/tests/pallet_ui/call_no_return.rs
+++ b/frame/support/test/tests/pallet_ui/call_no_return.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/duplicate_call_attr.rs b/frame/support/test/tests/pallet_ui/duplicate_call_attr.rs
index b8a32a0bd9f69..7bab1f95657b3 100644
--- a/frame/support/test/tests/pallet_ui/duplicate_call_attr.rs
+++ b/frame/support/test/tests/pallet_ui/duplicate_call_attr.rs
@@ -9,7 +9,7 @@ mod pallet {
 
 	#[pallet::pallet]
 	#[pallet::generate_store(trait Store)]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/duplicate_store_attr.rs b/frame/support/test/tests/pallet_ui/duplicate_store_attr.rs
index d675ddefe985b..c202b2671a69f 100644
--- a/frame/support/test/tests/pallet_ui/duplicate_store_attr.rs
+++ b/frame/support/test/tests/pallet_ui/duplicate_store_attr.rs
@@ -10,7 +10,7 @@ mod pallet {
 	#[pallet::pallet]
 	#[pallet::generate_store(trait Store)]
 	#[pallet::generate_store(trait Store)]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/error_no_fieldless.rs b/frame/support/test/tests/pallet_ui/error_no_fieldless.rs
index c9d444d6f90dd..4d3b975f558d2 100644
--- a/frame/support/test/tests/pallet_ui/error_no_fieldless.rs
+++ b/frame/support/test/tests/pallet_ui/error_no_fieldless.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/error_where_clause.rs b/frame/support/test/tests/pallet_ui/error_where_clause.rs
index 29d7435bc4bc8..d1464f496e27e 100644
--- a/frame/support/test/tests/pallet_ui/error_where_clause.rs
+++ b/frame/support/test/tests/pallet_ui/error_where_clause.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/error_wrong_item.rs b/frame/support/test/tests/pallet_ui/error_wrong_item.rs
index 50e66dc8c0dce..9e453d8cf1d92 100644
--- a/frame/support/test/tests/pallet_ui/error_wrong_item.rs
+++ b/frame/support/test/tests/pallet_ui/error_wrong_item.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/error_wrong_item_name.rs b/frame/support/test/tests/pallet_ui/error_wrong_item_name.rs
index 14107fafb06ea..813702daf0c12 100644
--- a/frame/support/test/tests/pallet_ui/error_wrong_item_name.rs
+++ b/frame/support/test/tests/pallet_ui/error_wrong_item_name.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_field_not_member.rs b/frame/support/test/tests/pallet_ui/event_field_not_member.rs
index 0ecde4c130878..40e03f4622f52 100644
--- a/frame/support/test/tests/pallet_ui/event_field_not_member.rs
+++ b/frame/support/test/tests/pallet_ui/event_field_not_member.rs
@@ -10,7 +10,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_not_in_trait.rs b/frame/support/test/tests/pallet_ui/event_not_in_trait.rs
index 94151ba4c3d9d..f080f3a0713ea 100644
--- a/frame/support/test/tests/pallet_ui/event_not_in_trait.rs
+++ b/frame/support/test/tests/pallet_ui/event_not_in_trait.rs
@@ -9,7 +9,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_type_invalid_bound.rs b/frame/support/test/tests/pallet_ui/event_type_invalid_bound.rs
index fa3bf04d3530d..4bd5bf0f4c843 100644
--- a/frame/support/test/tests/pallet_ui/event_type_invalid_bound.rs
+++ b/frame/support/test/tests/pallet_ui/event_type_invalid_bound.rs
@@ -10,7 +10,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_type_invalid_bound_2.rs b/frame/support/test/tests/pallet_ui/event_type_invalid_bound_2.rs
index 564a539b89f57..f604a3559e890 100644
--- a/frame/support/test/tests/pallet_ui/event_type_invalid_bound_2.rs
+++ b/frame/support/test/tests/pallet_ui/event_type_invalid_bound_2.rs
@@ -10,7 +10,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_wrong_item.rs b/frame/support/test/tests/pallet_ui/event_wrong_item.rs
index d6690557c39d8..84e0cf4d54815 100644
--- a/frame/support/test/tests/pallet_ui/event_wrong_item.rs
+++ b/frame/support/test/tests/pallet_ui/event_wrong_item.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/event_wrong_item_name.rs b/frame/support/test/tests/pallet_ui/event_wrong_item_name.rs
index d828965c5173c..3b25e66d7a492 100644
--- a/frame/support/test/tests/pallet_ui/event_wrong_item_name.rs
+++ b/frame/support/test/tests/pallet_ui/event_wrong_item_name.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/genesis_default_not_satisfied.rs b/frame/support/test/tests/pallet_ui/genesis_default_not_satisfied.rs
index da5e8d0c4da52..72bfeef370cda 100644
--- a/frame/support/test/tests/pallet_ui/genesis_default_not_satisfied.rs
+++ b/frame/support/test/tests/pallet_ui/genesis_default_not_satisfied.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/genesis_inconsistent_build_config.rs b/frame/support/test/tests/pallet_ui/genesis_inconsistent_build_config.rs
index 9ae851005acb3..2b28c7c3b7a70 100644
--- a/frame/support/test/tests/pallet_ui/genesis_inconsistent_build_config.rs
+++ b/frame/support/test/tests/pallet_ui/genesis_inconsistent_build_config.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/genesis_invalid_generic.rs b/frame/support/test/tests/pallet_ui/genesis_invalid_generic.rs
index f1eae16f49600..8bb55615e9d99 100644
--- a/frame/support/test/tests/pallet_ui/genesis_invalid_generic.rs
+++ b/frame/support/test/tests/pallet_ui/genesis_invalid_generic.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/genesis_wrong_name.rs b/frame/support/test/tests/pallet_ui/genesis_wrong_name.rs
index 5e8b297ba4ccf..b344b1b0f9f88 100644
--- a/frame/support/test/tests/pallet_ui/genesis_wrong_name.rs
+++ b/frame/support/test/tests/pallet_ui/genesis_wrong_name.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/inconsistent_instance_1.rs b/frame/support/test/tests/pallet_ui/inconsistent_instance_1.rs
index 00b57a01235c3..ecf55d9a97e49 100644
--- a/frame/support/test/tests/pallet_ui/inconsistent_instance_1.rs
+++ b/frame/support/test/tests/pallet_ui/inconsistent_instance_1.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config<I: 'static = ()>: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/inconsistent_instance_1.stderr b/frame/support/test/tests/pallet_ui/inconsistent_instance_1.stderr
index 352c21013cab0..3b1c056a45579 100644
--- a/frame/support/test/tests/pallet_ui/inconsistent_instance_1.stderr
+++ b/frame/support/test/tests/pallet_ui/inconsistent_instance_1.stderr
@@ -13,7 +13,7 @@ error: Invalid generic declaration, trait is defined with instance but generic u
 error: Invalid generic declaration, trait is defined with instance but generic use none
   --> $DIR/inconsistent_instance_1.rs:10:20
    |
-10 |     pub struct Pallet<T>(core::marker::PhantomData<T>);
+10 |     pub struct Pallet<T>(_);
    |                       ^
 
 error: Invalid generic declaration, trait is defined with instance but generic use none
diff --git a/frame/support/test/tests/pallet_ui/inconsistent_instance_2.rs b/frame/support/test/tests/pallet_ui/inconsistent_instance_2.rs
index e7b51cb5ebef5..3601194d9d2e9 100644
--- a/frame/support/test/tests/pallet_ui/inconsistent_instance_2.rs
+++ b/frame/support/test/tests/pallet_ui/inconsistent_instance_2.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T, I = ()>(core::marker::PhantomData<(T, I)>);
+	pub struct Pallet<T, I = ()>(_);
 
 	#[pallet::hooks]
 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {}
diff --git a/frame/support/test/tests/pallet_ui/inconsistent_instance_2.stderr b/frame/support/test/tests/pallet_ui/inconsistent_instance_2.stderr
index 9f5d3c740cbd1..c876aada14e3c 100644
--- a/frame/support/test/tests/pallet_ui/inconsistent_instance_2.stderr
+++ b/frame/support/test/tests/pallet_ui/inconsistent_instance_2.stderr
@@ -13,7 +13,7 @@ error: Invalid generic declaration, trait is defined without instance but generi
 error: Invalid generic declaration, trait is defined without instance but generic use some
   --> $DIR/inconsistent_instance_2.rs:10:20
    |
-10 |     pub struct Pallet<T, I = ()>(core::marker::PhantomData<(T, I)>);
+10 |     pub struct Pallet<T, I = ()>(_);
    |                       ^
 
 error: Invalid generic declaration, trait is defined without instance but generic use some
diff --git a/frame/support/test/tests/pallet_ui/inherent_check_inner_span.rs b/frame/support/test/tests/pallet_ui/inherent_check_inner_span.rs
index 9704a7e1a442e..fa79455fe8be5 100644
--- a/frame/support/test/tests/pallet_ui/inherent_check_inner_span.rs
+++ b/frame/support/test/tests/pallet_ui/inherent_check_inner_span.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/inherent_invalid_item.rs b/frame/support/test/tests/pallet_ui/inherent_invalid_item.rs
index 97eda44721307..adb7ec0d163dc 100644
--- a/frame/support/test/tests/pallet_ui/inherent_invalid_item.rs
+++ b/frame/support/test/tests/pallet_ui/inherent_invalid_item.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.rs b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.rs
new file mode 100644
index 0000000000000..cd865d9ed7ecd
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.rs
@@ -0,0 +1,14 @@
+#[frame_support::pallet]
+mod pallet {
+	use frame_support::pallet_prelude::Hooks;
+	use frame_system::pallet_prelude::BlockNumberFor;
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {}
+
+	#[pallet::pallet]
+	pub struct Pallet<T>();
+}
+
+fn main() {
+}
diff --git a/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.stderr b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.stderr
new file mode 100644
index 0000000000000..336dc387da826
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field.stderr
@@ -0,0 +1,5 @@
+error: Invalid pallet::pallet, expected 1 unnamed field: `(_)`
+  --> $DIR/pallet_struct_wrong_field.rs:10:22
+   |
+10 |     pub struct Pallet<T>();
+   |                         ^^
diff --git a/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.rs b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.rs
new file mode 100644
index 0000000000000..f648233423d38
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.rs
@@ -0,0 +1,16 @@
+#[frame_support::pallet]
+mod pallet {
+	use frame_support::pallet_prelude::Hooks;
+	use frame_system::pallet_prelude::BlockNumberFor;
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {}
+
+	#[pallet::pallet]
+	pub struct Pallet<T> {
+		some: T,
+	}
+}
+
+fn main() {
+}
diff --git a/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.stderr b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.stderr
new file mode 100644
index 0000000000000..473df45d1c2d2
--- /dev/null
+++ b/frame/support/test/tests/pallet_ui/pallet_struct_wrong_field2.stderr
@@ -0,0 +1,8 @@
+error: Invalid pallet::pallet, expected 1 unnamed field: `(_)`
+  --> $DIR/pallet_struct_wrong_field2.rs:10:23
+   |
+10 |       pub struct Pallet<T> {
+   |  __________________________^
+11 | |         some: T,
+12 | |     }
+   | |_____^
diff --git a/frame/support/test/tests/pallet_ui/storage_incomplete_item.rs b/frame/support/test/tests/pallet_ui/storage_incomplete_item.rs
index e451df8c78a02..847ff2063ee6c 100644
--- a/frame/support/test/tests/pallet_ui/storage_incomplete_item.rs
+++ b/frame/support/test/tests/pallet_ui/storage_incomplete_item.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/storage_invalid_first_generic.rs b/frame/support/test/tests/pallet_ui/storage_invalid_first_generic.rs
index c8df93c9b323d..fac5876868994 100644
--- a/frame/support/test/tests/pallet_ui/storage_invalid_first_generic.rs
+++ b/frame/support/test/tests/pallet_ui/storage_invalid_first_generic.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/storage_not_storage_type.rs b/frame/support/test/tests/pallet_ui/storage_not_storage_type.rs
index 03eee6fc8ec7d..0a2f02e1f3c3c 100644
--- a/frame/support/test/tests/pallet_ui/storage_not_storage_type.rs
+++ b/frame/support/test/tests/pallet_ui/storage_not_storage_type.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/storage_value_no_generic.rs b/frame/support/test/tests/pallet_ui/storage_value_no_generic.rs
index e62bdafaa2643..d20482c41c623 100644
--- a/frame/support/test/tests/pallet_ui/storage_value_no_generic.rs
+++ b/frame/support/test/tests/pallet_ui/storage_value_no_generic.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/storage_wrong_item.rs b/frame/support/test/tests/pallet_ui/storage_wrong_item.rs
index 56c4b86f2b35a..79062856b5ffb 100644
--- a/frame/support/test/tests/pallet_ui/storage_wrong_item.rs
+++ b/frame/support/test/tests/pallet_ui/storage_wrong_item.rs
@@ -7,7 +7,7 @@ mod pallet {
 	pub trait Config: frame_system::Config {}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/store_trait_leak_private.rs b/frame/support/test/tests/pallet_ui/store_trait_leak_private.rs
index 3ebd1cb9fa608..01967c20c9392 100644
--- a/frame/support/test/tests/pallet_ui/store_trait_leak_private.rs
+++ b/frame/support/test/tests/pallet_ui/store_trait_leak_private.rs
@@ -9,7 +9,7 @@ mod pallet {
 
 	#[pallet::pallet]
 	#[pallet::generate_store(pub trait Store)]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/trait_constant_invalid_bound.rs b/frame/support/test/tests/pallet_ui/trait_constant_invalid_bound.rs
index ce599d5a31e71..4e3c75a7efea9 100644
--- a/frame/support/test/tests/pallet_ui/trait_constant_invalid_bound.rs
+++ b/frame/support/test/tests/pallet_ui/trait_constant_invalid_bound.rs
@@ -10,7 +10,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/trait_invalid_item.rs b/frame/support/test/tests/pallet_ui/trait_invalid_item.rs
index 8537659dcd037..66333566b80f4 100644
--- a/frame/support/test/tests/pallet_ui/trait_invalid_item.rs
+++ b/frame/support/test/tests/pallet_ui/trait_invalid_item.rs
@@ -10,7 +10,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_ui/trait_no_supertrait.rs b/frame/support/test/tests/pallet_ui/trait_no_supertrait.rs
index 0fc987f7bbdd7..4f72ab98ec9fa 100644
--- a/frame/support/test/tests/pallet_ui/trait_no_supertrait.rs
+++ b/frame/support/test/tests/pallet_ui/trait_no_supertrait.rs
@@ -8,7 +8,7 @@ mod pallet {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T>(core::marker::PhantomData<T>);
+	pub struct Pallet<T>(_);
 
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
diff --git a/frame/support/test/tests/pallet_version.rs b/frame/support/test/tests/pallet_version.rs
index 4cc93d395db2a..bb54daa7447fc 100644
--- a/frame/support/test/tests/pallet_version.rs
+++ b/frame/support/test/tests/pallet_version.rs
@@ -110,7 +110,7 @@ mod pallet4 {
 	}
 
 	#[pallet::pallet]
-	pub struct Pallet<T, I=()>(PhantomData<(T, I)>);
+	pub struct Pallet<T, I=()>(_);
 
 	#[pallet::hooks]
 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {