original self.

* eval.c (rb_eval_cmd): respect ruby_wrapper if set.

* eval.c (eval): do not update ruby_class unless scope is not
  provided.

* eval.c (eval): preserve wrapper information.

* eval.c (proc_invoke): ditto.

* eval.c (block_pass): ditto.

* parse.y (void_expr): too much warnings for void context
  (e.g. foo[1] that can be mere Proc call).


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e