PyErr_NormalizeException(): If the exception's type is a class and the
instance's class is a subclass of this, then use the instance's class
as the exception type.
diff --git a/Python/errors.c b/Python/errors.c
index 31d9cdf..7b8c03f 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -206,6 +206,14 @@
Py_DECREF(value);
value = res;
}
+ /* if the class of the instance doesn't exactly match the
+ class of the type, believe the instance
+ */
+ else if (inclass != type) {
+ Py_DECREF(type);
+ type = inclass;
+ Py_INCREF(type);
+ }
}
*exc = type;
*val = value;