The only warning I can give is that using an undef in the list will throw warnings (errors?) in older versions of perl:
my (undef, $foo, undef, $bar) = @array;

Never fear. Just move your my.
(undef, my $foo, undef, my $bar) = @array;

[download]

This is particularly more useful in cases where you already have a declared variable.
my $foo = "ab";
(my $avar, $foo) = ($foo =~ /(.)(.)/);

[download]


my @a=qw(random brilliant braindead); print $a[rand(@a)];

In reply to Re^3: my $x or my ($x) by Rhandom
in thread my $x or my ($x) by tamaguchi

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