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use Filter::Handle qw/subs/; . ... Filter \*STDOUT, sub { local $_ = "@_" print <FH1> "$_\n"; $_};
Deep recursion on subroutine "Filter::Handle::PRINT" at /lib/myfiltermodule.pm line 19 (#1) ... case it indicates something else. Deep recursion on anonymous subroutine at /lib/Filter/Handle.pm line 4 +2.