* lib/mathn.rb: removed commented-out code.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47280 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-08-26

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47281 b2dd03c8-39d4-4d8f-98ff-823fe69b080e