experimental patch

sagemath · Mar 24, 2024 · 191c2c3 · 191c2c3
1 parent 5b5e025
commit 191c2c3
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/sage/structure/unique_representation.py b/src/sage/structure/unique_representation.py
@@ -1091,13 +1091,16 @@ def _clear_cache_(cls):
             False
         """
         cache = None
+        how_many = 0
         for C in cls.mro():
             try:
                 cache = C.__classcall__.cache
             except AttributeError:
                 pass
             else:
-                break
+                how_many += 1  # break
+        if how_many > 1:
+            raise RuntimeError(f"several caches in {cls}")
         del_list = [k for k in cache
                     if issubclass(k[0][0], cls)]
         for k in del_list: