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use strict;
use warnings;
...
print "foo is >$foo<\n";
__END__
foo is >3<

use strict;
use warnings;
...
__END__
Global symbol "$foo" requires explicit package name at - line 10.
Execution of - aborted due to compilation errors.

use strict;
use warnings;
...
__END__
Global symbol "$foo" requires explicit package name at - line 10.
Execution of - aborted due to compilation errors.