* parse.y (value_expr_gen): now NODE_DEFN and NODE_DEFS are not void
  value expressions.  get rid of wrong warning with -w, and make to
  pass tests with chkbuild.  ref. [Feature #3753]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42347 b2dd03c8-39d4-4d8f-98ff-823fe69b080e