patch 9.0.1334: using tt_member for the class leads to mistakes
Problem: Using tt_member for the class leads to mistakes.
Solution: Add a separate tt_class field.
diff --git a/src/structs.h b/src/structs.h
index 584d472..bf00393 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1451,7 +1451,7 @@
int8_T tt_min_argcount; // number of non-optional arguments
char_u tt_flags; // TTFLAG_ values
type_T *tt_member; // for list, dict, func return type
- // for class: class_T
+ class_T *tt_class; // for class and object
type_T **tt_args; // func argument types, allocated
};