perl5.18.1環境で実行したらopenでエラーになったのでsplitして対応

Strings with code points over 0xFF may not be mapped into in-memory file
handles
readline() on closed filehandle $fh at
/Users/no-kumagai/Dropbox/develop/perl/2ch/local/lib/perl5/WWW/BBS/2ch/Thread.pm
line 44.

===

% perl -v

This is perl 5, version 18, subversion 1 (v5.18.1) built for
darwin-2level