error 0
 crypto_sign does not handle m=c overlap
 ==4552== Memcheck, a memory error detector
 ==4552== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==4552== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==4552== Command: ./try
 ==4552==
 ==4552==
 ==4552== HEAP SUMMARY:
 ==4552==     in use at exit: 810,960 bytes in 10 blocks
 ==4552==   total heap usage: 14,863 allocs, 14,853 frees, 2,276,394 bytes allocated
 ==4552==
 ==4552== LEAK SUMMARY:
 ==4552==    definitely lost: 0 bytes in 0 blocks
 ==4552==    indirectly lost: 0 bytes in 0 blocks
 ==4552==      possibly lost: 810,960 bytes in 10 blocks
 ==4552==    still reachable: 0 bytes in 0 blocks
 ==4552==         suppressed: 0 bytes in 0 blocks
 ==4552== Rerun with --leak-check=full to see details of leaked memory
 ==4552==
 ==4552== For lists of detected and suppressed errors, rerun with: -s
 ==4552== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)