* marshal.c (w_object): instance variable dump do not cause error

  for objects that cannot be dumped, if they traversed from
  marshal_dump.  they are just ignored.

* gc.c (Init_stack): cast "space" (doble value) into unsigned
  int.  should run on PowerPC.

* eval.c (rb_eval): should not execute else part if any exception
  is caught. [ruby-dev:21482]

* parse.y (f_args): should allow unparenthesized block argument.

* parse.y (f_rest_arg): should allow unparenthesized rest
  argument.

* lib/irb/ruby-lex.rb (RubyLex::identify_identifier): support
  'class ::Foo' syntax. [ruby-talk:83514]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4680 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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