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  1. or download this
    #!/usr/bin/perl
use warnings;
...
sub hello {
    print "hello";
}
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    hello
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    #!/usr/bin/perl
use warnings;
...
sub hello {
    print "hello";
}
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    Bareword "Foo" not allowed while "strict subs" in use at test.pl line 
+10.
Execution of test.pl aborted due to compilation errors.