warn

warn

ri

 More than one method matched your request. You can refine
 your search by asking for information on one of:
 
      Kernel#warn, Logger#warn?, Logger#warn

refe

 Kernel#warn
 --- warn(mesg)
 
     ruby 1.8 feature
 
     mesg と改行を順番に $deferr に出力します。
 
         $deferr.print mesg, "\n"
         mesg
 
     と同じです。mesg を返します。