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sub jah {
        while (my $d = shift) {
...
@_ = qw(foo bar bat);
jah(); # produces no output
jah(qw(foo bar bat)); # produces output

perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>); 
+$rose = "smells sweet to degree $n"; *other_name = *rose; print "$oth
+er_name\n"'