>perl -wMstrict -le
"my %hash = ('a' => 1,  'b' => 2,  {} => 4);
 print qq{key '$_' -> value '$hash{$_}'} for keys %hash;
 my $hashref = \%hash;
 print qq{hashref is '$hashref'};
 my $objectref = bless $hashref;
 print qq{objectref is '$objectref'};
"
key 'a' -> value '1'
key 'b' -> value '2'
key 'HASH(0x56c19c)' -> value '4'
hashref is 'HASH(0x431d5c)'
objectref is 'main=HASH(0x431d5c)'