remove copy

Author: jakkdl

src/trio/_threads.py

@@ -2,7 +2,6 @@
 
 import contextlib
 import contextvars
-import copy
 import inspect
 import queue as stdlib_queue
 import threading
@@ -433,7 +432,7 @@ def abort(raise_cancel: RaiseCancelT) -> trio.lowlevel.Abort:
             # fill so from_thread_check_cancelled can raise
             # 'raise_cancel' will immediately delete its reason object, so we make
             # a copy in each thread
-            cancel_register[0] = copy.copy(raise_cancel)
+            cancel_register[0] = raise_cancel
             if abandon_bool:
                 # empty so report_back_in_trio_thread_fn cannot reschedule
                 task_register[0] = None