error 0
 crypto_sign does not handle m=c overlap
 ==11219== Memcheck, a memory error detector
 ==11219== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==11219== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==11219== Command: ./try
 ==11219==
 ==11219==
 ==11219== HEAP SUMMARY:
 ==11219==     in use at exit: 1,371,800 bytes in 10 blocks
 ==11219==   total heap usage: 19,768 allocs, 19,758 frees, 3,804,281 bytes allocated
 ==11219==
 ==11219== LEAK SUMMARY:
 ==11219==    definitely lost: 0 bytes in 0 blocks
 ==11219==    indirectly lost: 0 bytes in 0 blocks
 ==11219==      possibly lost: 1,371,800 bytes in 10 blocks
 ==11219==    still reachable: 0 bytes in 0 blocks
 ==11219==         suppressed: 0 bytes in 0 blocks
 ==11219== Rerun with --leak-check=full to see details of leaked memory
 ==11219==
 ==11219== For lists of detected and suppressed errors, rerun with: -s
 ==11219== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)