source: doc/theses/andrew_beach_MMath/code/fixup-empty-f.cfa

// Resume Across Fixup
#include <clock.hfa>
#include <fstream.hfa>
#include <stdlib.hfa>

void nounwind_fixup(unsigned int frames, void (*raised_rtn)(int &)) {
        if (frames) {
                nounwind_fixup(frames - 1, raised_rtn);
                // "Always" false, but prevents recursion elimination.
                if (-1 == frames) printf("~");
        } else {
                int fixup = 17;
                raised_rtn(fixup);
        }
}

int main(int argc, char * argv[]) {
        unsigned int times = 1;
        unsigned int total_frames = 1;
        if (1 < argc) {
                times = strto(argv[1], 0p, 10);
        }
        if (2 < argc) {
                total_frames = strto(argv[2], 0p, 10);
        }

        // Closures at the top level are allowed to be true closures.
        void raised(int & fixup) {
                fixup = total_frames + 42;
                if (total_frames == 42) printf("42");
        }

        Time start_time = timeHiRes();
        for (unsigned int count = 0 ; count < times ; ++count) {
                nounwind_fixup(total_frames, raised);
        }
        Time end_time = timeHiRes();
        sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.);
}