Note that:
my $s = ();
is equivelent to
my $s = (undef);
which is equivelent to:
my $s;
The first use of a hash ref autovivifies the referred hash making the previous assignment redundant (and misleading). Consider:
use strict;
use warnings;
use Data::Dump::Streamer;
my $s = ();
Dump ($s);
$s->{'a'} = 10 ;
Dump ($s);
which prints:
$VAR1 = undef;
$HASH1 = { a => 10 };
and note that the contents of $s changes from an undefined value to a hash ref.
If you really want to indicate intent with an assignment use:
my $s = {};
DWIM is Perl's answer to Gödel
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