Merge branch 'main' into pbrubeck/simplify-indexed

FEniCS · Jan 1, 2025 · a2ebdfb · a2ebdfb
2 parents 7100560 + eabdb00
commit a2ebdfb
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/ufl/action.py b/ufl/action.py
@@ -179,12 +179,16 @@ def _check_function_spaces(left, right):
     # `action(Coefficient(V), Cofunction(V.dual()))`.
     if isinstance(left, Coefficient):
         V_left = left.ufl_function_space()
-    else:
+    elif isinstance(left, BaseForm):
         V_left = left.arguments()[-1].ufl_function_space().dual()
+    else:
+        raise TypeError("Action left argument must be either Coefficient or BaseForm")
     if isinstance(right, Coefficient):
         V_right = right.ufl_function_space()
-    else:
+    elif isinstance(right, BaseForm):
         V_right = right.arguments()[0].ufl_function_space().dual()
+    else:
+        raise TypeError("Action right argument must be either Coefficient or BaseForm")
 
     if V_left.dual() != V_right:
         raise TypeError("Incompatible function spaces in Action")