🚀 go-pugleaf

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def cat(String str)
   ...
end
def cat(File f)
   ...
end

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def cat(f)
   if f.instance_of?(String)
      ...
   elsif f.instance_of?(File)
      ...
   else
      ...
   end
   ...
end

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-- 
$B8^==Mr(B $B98(B(ikarashi@itlb.te.noda.sut.ac.jp)