Method Ruby on Rails 5.1.2 Class Method < Object activesupport/lib/active_support/core_ext/object/duplicable.rb Methods D duplicable? Instance Public methods duplicable?() Link Methods are not duplicable: method(:puts).duplicable? # => false method(:puts).dup # => TypeError: allocator undefined for Method Source: show | on GitHub # File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 121 def duplicable? false end