Issue #9136 has been updated by nobu (Nobuyoshi Nakada). FYI, Kernel.instance_method(:to_enum).bind(basic_object).call can work since 2.0. ---------------------------------------- misc #9136: Deprecated Enumerator.new(object, method) bad for BasicObject https://bugs.ruby-lang.org/issues/9136#change-43072 Author: atlas (Atlas Prime) Status: Assigned Priority: Normal Assignee: zzak (Zachary Scott) Category: core Target version: =begin Documentation it says: In the second, deprecated, form, a generated Enumerator iterates over the given object using the given method with the given arguments passed. Use of this form is discouraged. Use Kernel#enum_for or Kernel#to_enum instead. e = Enumerator.new(ObjectSpace, :each_object) #-> ObjectSpace.enum_for(:each_object) But (({#enum_for})) and (({#to_enum})) are not available to subclasses of (({BasicObject})). In fact, I was defining (({#to_enum})) for a class that is a subclass of (({BasicObject})), and now I get warning of deprecation. =end -- http://bugs.ruby-lang.org/