main::(Cache-Mmap.pl:13):       print "val1: $val1\n";
  DB<1>
val1: 1
main::(Cache-Mmap.pl:14):       $cache->write($key1,$val1);
  DB<1>
not a reference at /usr/local/lib64/perl5/Cache/Mmap.pm line 1050.
 at /usr/lib64/perl5/vendor_perl/Storable.pm line 38.
        Storable::__ANON__[/usr/lib64/perl5/vendor_perl/Storable.pm:39]('not a reference') called at /usr/lib64/perl5/vendor_perl/Storable.pm line 335
        Storable::_freeze('CODE(0x185e640)', 1) called at /usr/lib64/perl5/vendor_perl/Storable.pm line 319
        Storable::freeze(1) called at /usr/local/lib64/perl5/Cache/Mmap.pm line 1050
        Cache::Mmap::_encode('Cache::Mmap=HASH(0x197e3d0)', 1, 0) called at /usr/local/lib64/perl5/Cache/Mmap.pm line 401
        Cache::Mmap::write('Cache::Mmap=HASH(0x197e3d0)', 'Test', 1) called at Cache-Mmap.pl line 14
Debugged program terminated.  Use q to quit or R to restart,
  use o inhibit_exit to avoid stopping after program termination,
  h q, h R or h o to get additional info.