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          perl -d:Modlist=options script.pl
          perl -MDevel::Modlist=options script.pl # equivalent

#!perl
  #use strict;  #commented to not pollute %INC
...
eval $begin.$content;
print $@ if $@;

perl -c -e "BEGIN{print qq(1-begin\n)};
            UNITCHECK {print qq(2-unitcheck\n)};
...
5-main
6-end