Update exceptions.py

wxtim · web-flow · commit 9ed0cc989847 · 2024-06-12T16:52:20.000+01:00
diff --git a/cylc/flow/exceptions.py b/cylc/flow/exceptions.py
@@ -21,6 +21,7 @@
     Dict,
     Optional,
     Sequence,
+    Set,
     Union,
     TYPE_CHECKING,
 )
