error 0
 crypto_sign does not handle m=c overlap
 ==15093== Memcheck, a memory error detector
 ==15093== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==15093== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==15093== Command: ./try
 ==15093==
 ==15093==
 ==15093== HEAP SUMMARY:
 ==15093==     in use at exit: 2,138,300 bytes in 10 blocks
 ==15093==   total heap usage: 21,088 allocs, 21,078 frees, 5,690,309 bytes allocated
 ==15093==
 ==15093== LEAK SUMMARY:
 ==15093==    definitely lost: 0 bytes in 0 blocks
 ==15093==    indirectly lost: 0 bytes in 0 blocks
 ==15093==      possibly lost: 2,138,300 bytes in 10 blocks
 ==15093==    still reachable: 0 bytes in 0 blocks
 ==15093==         suppressed: 0 bytes in 0 blocks
 ==15093== Rerun with --leak-check=full to see details of leaked memory
 ==15093==
 ==15093== For lists of detected and suppressed errors, rerun with: -s
 ==15093== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)