Look at the bottom of Not so symbolic references in perlref.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^6: Passing argument by reference (for a scalar) by choroba
in thread Passing argument by reference (for a scalar) by jmClifford

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