1 files changed, 6 insertions, 2 deletions
diff --git a/coverage/parser.py b/coverage/parser.py
index 8792d0ac..5c467a7e 100644
--- a/coverage/parser.py
+++ b/coverage/parser.py
@@ -437,11 +437,15 @@ class BlockBase:
     # pylint: disable=unused-argument
     def process_break_exits(self, exits, add_arc):
         """Process break exits."""
-        return False
+        # Because break can only appear in loops, and most subclasses
+        # implement process_break_exits, this function is never reached.
+        raise AssertionError
 
     def process_continue_exits(self, exits, add_arc):
         """Process continue exits."""
-        return False
+        # Because continue can only appear in loops, and most subclasses
+        # implement process_continue_exits, this function is never reached.
+        raise AssertionError
 
     def process_raise_exits(self, exits, add_arc):
         """Process raise exits."""