Nice trick!
Interestingly, it doesn't work for me. In the debugger, I'm getting
cont:
Can't find string terminator "\" anywhere before EOF at (eval 13)[/usr
+/lib/perl5/5.26.1/perl5db.pl:738] line 2.
at (eval 13)[/usr/lib/perl5/5.26.1/perl5db.pl:738] line 2.
eval '' called at /usr/lib/perl5/5.26.1/perl5db.pl line 738
DB::eval called at /usr/lib/perl5/5.26.1/perl5db.pl line 3140
DB::DB called at -e line 1
And if I run it in a script instead, the output is _, not \ :-o
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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