error 0
 ==18572== Memcheck, a memory error detector
 ==18572== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==18572== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==18572== Command: ./try
 ==18572==
 Alarm clock