error 0
 crypto_sign does not handle m=c overlap
 ==4602== Memcheck, a memory error detector
 ==4602== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==4602== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==4602== Command: ./try
 ==4602==
 ==4602==
 ==4602== HEAP SUMMARY:
 ==4602==     in use at exit: 810,960 bytes in 10 blocks
 ==4602==   total heap usage: 14,863 allocs, 14,853 frees, 2,276,394 bytes allocated
 ==4602==
 ==4602== LEAK SUMMARY:
 ==4602==    definitely lost: 0 bytes in 0 blocks
 ==4602==    indirectly lost: 0 bytes in 0 blocks
 ==4602==      possibly lost: 810,960 bytes in 10 blocks
 ==4602==    still reachable: 0 bytes in 0 blocks
 ==4602==         suppressed: 0 bytes in 0 blocks
 ==4602== Rerun with --leak-check=full to see details of leaked memory
 ==4602==
 ==4602== For lists of detected and suppressed errors, rerun with: -s
 ==4602== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)