if rb_f_notimplement is given.
(rb_define_protected_method): ditto.
(rb_define_private_method): ditto.
(rb_define_method): use rb_define_method_id.
* include/ruby/intern.h (rb_f_notimplement): declared.
(rb_define_notimplement_method_id): declared.
* proc.c (method_inspect): show not-implemented.
* vm_method.c (notimplement_body): new variable.
(rb_notimplement_body_p): new function.
(rb_method_boundp): return false if not implemented.
(rb_f_notimplement): new function.
(rb_define_notimplement_method_id): new function.
* process.c (rb_f_fork): use rb_f_notimplement if not implemented.
* file.c (rb_file_s_lchmod): use rb_f_notimplement if not implemented.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
