* eval.c (ruby_finalize): should enclosed by PUSH_TAG/POP_TAG.
* eval.c (rb_mod_define_method): wrong comparison for blocks.
* gc.c (id2ref): should handle Symbol too.
* gc.c (id2ref): should print original ptr value
* eval.c (rb_iterate): NODE_CFUNC does not protect its data
(nd_tval), so create new node NODE_IFUNC for iteration C
function.
* eval.c (rb_yield_0): use NODE_IFUNC.
* gc.c (rb_gc_mark): support NODE_IFUNC.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
