Examples: don't raise in a Traits observer (#455)

enthought · Jul 28, 2021 · 776ef71 · 776ef71
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diff --git a/docs/source/guide/examples/interruptible_task.py b/docs/source/guide/examples/interruptible_task.py
@@ -98,7 +98,7 @@ def _report_result(self, event):
         else:
             # Shouldn't ever get here: CANCELLED, FAILED and COMPLETED
             # are the only possible final states of a future.
-            raise RuntimeError(f"Unexpected state: {self.future.state}")
+            assert False, f"Impossible state: {self.future.state}"
         self.future = None
 
     @observe("future:result_event")

diff --git a/docs/source/guide/examples/non_interruptible_task.py b/docs/source/guide/examples/non_interruptible_task.py
@@ -96,7 +96,7 @@ def _report_result(self, event):
         else:
             # Shouldn't ever get here: CANCELLED, FAILED and COMPLETED
             # are the only possible final states of a future.
-            raise RuntimeError(f"Unexpected state: {self.future.state}")
+            assert False, f"Impossible state: {self.future.state}"
         self.future = None
 
     def _get_can_calculate(self):