in reply to Basic debugging checklist

Maybe it's time to update the eval line to 
eval { do_something(); 1 } or warn $@;

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Here's why: Bug in eval in pre-5.14

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

In Section Tutorials