-typedef bool var_is_missing_func (const struct variable *,
- const union value *);
-bool var_is_value_missing (const struct variable *, const union value *);
-bool var_is_num_missing (const struct variable *, double);
-bool var_is_str_missing (const struct variable *, const char[]);
-bool var_is_value_user_missing (const struct variable *,
- const union value *);
-bool var_is_num_user_missing (const struct variable *, double);
-bool var_is_str_user_missing (const struct variable *, const char[]);
-bool var_is_value_system_missing (const struct variable *,
- const union value *);
+bool var_is_value_missing (const struct variable *, const union value *,
+ enum mv_class);
+bool var_is_num_missing (const struct variable *, double, enum mv_class);
+bool var_is_str_missing (const struct variable *, const uint8_t[], enum mv_class);