fix(frontend-python): failure to display invalid input set value

frontends/concrete-python/concrete/fhe/compilation/utils.py

@@ -97,7 +97,10 @@ def validate_input_args(
                 sanitized_args[index] = arg
 
         if not is_valid:
-            actual_value = ValueDescription.of(arg, is_encrypted=is_encrypted)
+            try:
+                actual_value = str(ValueDescription.of(arg, is_encrypted=is_encrypted))
+            except ValueError:
+                actual_value = type(arg).__name__
             message = f"Expected argument {index} to be {expected_value} but it's {actual_value}"
             raise ValueError(message)
 

frontends/concrete-python/tests/compilation/test_circuit.py

@@ -180,6 +180,14 @@ def f(x, y):
 
     assert str(excinfo.value) == "Expected argument 0 to be an fhe.Value but it's dict"
 
+    # with invalid argument
+    # ---------------------
+
+    with pytest.raises(ValueError) as excinfo:
+        circuit.encrypt_run_decrypt({"yes": "no"}, 10)
+
+    assert str(excinfo.value) == "Expected argument 0 to be EncryptedScalar<uint6> but it's dict"
+
 
 def test_circuit_separate_args(helpers):
     """