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  1. or download this
    do 5.00504;
print "\n";
print $!, "\n" if $!;
# output: Perl 5.00504 required--this is only version 5.00503, stopped
+ at do.pl line 6.
  2. or download this
    do 5.00503;
print "\n";
print $!, "\n" if $!;
# output: No such file or directory