specified instance variable is not defined.
* variable.c (generic_ivar_remove): modified to check ivar
existence.
* class.c (rb_singleton_class): wrong condition; was creating
unnecessary singleton class.
* numeric.c (int_step): step may be a float less than 1.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 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
