error 0
 crypto_sign does not handle m=c overlap
 ==13184== Memcheck, a memory error detector
 ==13184== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==13184== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==13184== Command: ./try
 ==13184==
 ==13184==
 ==13184== HEAP SUMMARY:
 ==13184==     in use at exit: 2,138,300 bytes in 10 blocks
 ==13184==   total heap usage: 21,088 allocs, 21,078 frees, 5,690,309 bytes allocated
 ==13184==
 ==13184== LEAK SUMMARY:
 ==13184==    definitely lost: 0 bytes in 0 blocks
 ==13184==    indirectly lost: 0 bytes in 0 blocks
 ==13184==      possibly lost: 2,138,300 bytes in 10 blocks
 ==13184==    still reachable: 0 bytes in 0 blocks
 ==13184==         suppressed: 0 bytes in 0 blocks
 ==13184== Rerun with --leak-check=full to see details of leaked memory
 ==13184==
 ==13184== For lists of detected and suppressed errors, rerun with: -s
 ==13184== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)