extern int x1f4_hack_expression (void *x1f4_expression, struct x1f4_variable_type *variable, void *hack_expression);
x1f4_hack_expression function replaces the
occurences of the variable indicated by the variable definition pointed to by
variable with the
hack_expression does not have the same type as the variable it
x1f4_hack_expression function returns non zero.
The function returns
0 for success, non zero for failure.
If the function fails for whatever reason the expression parsed representation may be no longer valid for any other purposes but destruction.
x1f4_expression expression has been changed the expression
evaluation stack memory requirements have also been modified.
See Managing Stacks.