source: tests/exceptions/cancel/coroutine.cfa

// Try cancelling a coroutine.

#include <fstream.hfa>
#include <coroutine.hfa>

exception internal_error {};
vtable(internal_error) internal_vt;

coroutine WillCancel {};

const char * msg(CoroutineCancelled(WillCancel) * this) {
        return "CoroutineCancelled(WillCancel)";
}

void main(WillCancel & wc) {
        sout | '1';
        cancel_stack((internal_error){&internal_vt});
        sout | '!';
}

int main(int argc, char * argv[]) {
        sout | nlOff;
        WillCancel cancel;
        try {
                sout | '0';
                resume(cancel);
                sout | '4';
        } catchResume (CoroutineCancelled(WillCancel) * error) {
                sout | '2';
                if ((virtual internal_error *)error->the_exception) {
                        sout | '3';
                }
        }
        sout | '5' | nl;
}