NonSend resources cannot be accessed using `World::resource_scope`

[alice-i-cecile]

The current bound on World::resource_scope is too tight: we require Send + Sync in the form of the Resource trait, when there's no need for it.

As a result, there's no way to use resource_scope with NonSend resources, which is a frustrating inconsistency.

[james7132]

#6037 was also asking for this, and #6113 added support for this in World::resource_scope.

Closing this issue as this is already done.

However, #6534 is potentially looking to remove support for this as NonSend resources are likely to be moved outside of World in the future, should #6534 be merged and someone was actually reliant on this functionality, this issue should be reopened.

[RaasAhsan]

What is the recommended way to do this on 0.11?

[alice-i-cecile]

Use a SystemState.