git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45987 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* include/ruby/missing.h (nextafter): New optional declaration. * missing/nextafter.c: New file. * numeric.c: Float#next_float and Float#prev_float implemented. [ruby-core:62562] [Feature #9834] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45982 b2dd03c8-39d4-4d8f-98ff-823fe69b080e