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extern int x1f4_hack_expression
(void *x1f4_expression, struct x1f4_variable_type *variable,
void *hack_expression);
The x1f4_hack_expression function replaces the x1f4_expression
occurences of the variable indicated by variable with the
hack_expression expression.
If the hack_expression does not have the same type as the variable it
replaces the 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If the function fails for whatever reason the expression parsed representation may be no longer valid for any other purposes but destruction.
See x1f4_fini_expression.
If the x1f4_expression expression has been changed the expression
evaluation stack memory requirements have also been modified.
See Managing Stacks.