$ perl -E 'use Data::Dump; my $x = {qw{a 1 b 2}}; dd $x'
{ a => 1, b => 2 }
$ perl -E 'use Data::Dump qw{!dd}; my $x = {qw{a 1 b 2}}; dd $x'
Can't call method "dd" on unblessed reference at -e line 1.
$