Commits on Jun 5, 2023

1. rt: EnterGuard should not be Send …

   Removes `Send` from `EnterGuard` (returned by `Handle::enter()`. The
   guard type changes a thread-local variable on drop. If the guard is
   moved to a different thread, it would modify the wrong thread-local.
   
   This is a **breaking change** but it fixes a bug and prevents incorrect
   user behavior. If user code breaks because of this, it is because they
   (most likely) have a bug in their code.

   

   carllerche committed Jun 5, 2023
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