From 8d23a5bea5b42f46ef7f337422844799fb5112a1 Mon Sep 17 00:00:00 2001
From: Stepan Koltsov <stepan.koltsov@gmail.com>
Date: Sat, 30 Dec 2023 21:58:04 +0000
Subject: [PATCH] impl ExclusiveSystemParam for PhantomData

---
 crates/bevy_ecs/src/system/exclusive_system_param.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/crates/bevy_ecs/src/system/exclusive_system_param.rs b/crates/bevy_ecs/src/system/exclusive_system_param.rs
index 2eb3c06941ed6..3ffa25523bf4d 100644
--- a/crates/bevy_ecs/src/system/exclusive_system_param.rs
+++ b/crates/bevy_ecs/src/system/exclusive_system_param.rs
@@ -6,6 +6,7 @@ use crate::{
 };
 use bevy_utils::all_tuples;
 use bevy_utils::synccell::SyncCell;
+use std::marker::PhantomData;
 
 /// A parameter that can be used in an exclusive system (a system with an `&mut World` parameter).
 /// Any parameters implementing this trait must come after the `&mut World` parameter.
@@ -70,6 +71,17 @@ impl<'_s, T: FromWorld + Send + 'static> ExclusiveSystemParam for Local<'_s, T>
     }
 }
 
+impl<S: ?Sized> ExclusiveSystemParam for PhantomData<S> {
+    type State = ();
+    type Item<'s> = PhantomData<S>;
+
+    fn init(_world: &mut World, _system_meta: &mut SystemMeta) -> Self::State {}
+
+    fn get_param<'s>(_state: &'s mut Self::State, _system_meta: &SystemMeta) -> Self::Item<'s> {
+        PhantomData
+    }
+}
+
 macro_rules! impl_exclusive_system_param_tuple {
     ($($param: ident),*) => {
         #[allow(unused_variables)]