error 0
 ==3969== Memcheck, a memory error detector
 ==3969== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==3969== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==3969== Command: ./try
 ==3969==
 Alarm clock