Fix Kernel#singleton_method with Module#Prepend * proc.c (rb_obj_singleton_method): search the method entry from the origin class, for fix prepended modules. [Bug #14658] From: Vasiliy Ermolovich <younash@gmail.com> proc.c: fix segfault when no singleton class * proc.c (rb_obj_singleton_method): bail out if the receiver does not have the singleton class without accessing the origin class not to segfault. [Bug #14658]
merge revision(s) 63067,63068: [Backport #14658]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@65118 b2dd03c8-39d4-4d8f-98ff-823fe69b080e