From 83b602a77c10f9212984cdd00fc1cc7d7955a677 Mon Sep 17 00:00:00 2001
From: JoJoJet <21144246+JoJoJet@users.noreply.github.com>
Date: Sun, 25 Dec 2022 00:51:14 +0000
Subject: [PATCH] Relax `Sync` bound on anonymous `Command`s (#7014)

# Objective

Any closure with the signature `FnOnce(&mut World)` implicitly implements the trait `Command` due to a blanket implementation. However, this implementation unnecessarily has the `Sync` bound, which limits the types that can be used.

## Solution

Remove the bound.

---

## Changelog

- `Command` closures no longer need to implement the marker trait `std::marker::Sync`.
---
 crates/bevy_ecs/src/system/commands/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/bevy_ecs/src/system/commands/mod.rs b/crates/bevy_ecs/src/system/commands/mod.rs
index e89d365948..7fede918fd 100644
--- a/crates/bevy_ecs/src/system/commands/mod.rs
+++ b/crates/bevy_ecs/src/system/commands/mod.rs
@@ -709,7 +709,7 @@ impl<'w, 's, 'a> EntityCommands<'w, 's, 'a> {
 
 impl<F> Command for F
 where
-    F: FnOnce(&mut World) + Send + Sync + 'static,
+    F: FnOnce(&mut World) + Send + 'static,
 {
     fn write(self, world: &mut World) {
         self(world);