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#!/usr/bin/env perl

...
__END__

 perl -MO=Deparse double_bracket_op.pl double_bracket_op.pl
use warnings;
...
}
__DATA__
double_bracket_op.pl syntax OK

#!/usr/bin/env perl

...
bar
nose
cuke

package MyClass;

...

__END__

package Foo {

...

__END__