There is a third alternative space here: functions that are compatible with C function pointers, dynamically created by libffi. With these you can implement upw

There is a third alternative space here: functions that are compatible with C function pointers, dynamically created by libffi. With these you can implement upward and downward funargs. E.g. make Lisp dialect whose lambdas can be bound to C callbacks. I have test cases in TXR where qsort is used to sort an array of strings: https://www.kylheku.com/cgit/txr/tree/tests/017/qsort.tl https://www.kylheku.com/cgit/txr/tree/tests/017/qsort.tl https://www.kylheku.com/cgit/txr/tree/tests/017/qsort.expected https://www.kylheku.com/cgit/txr/tree/tests/017/qsort.expect...