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Issue #13326 has been updated by ojab (ojab ojab).
Ah, hadn't known about `respond_to_missing?`, thanks for the advise.
----------------------------------------
Bug #13326: Forwarding methods to :method_missing produces a warning
https://bugs.ruby-lang.org/issues/13326#change-63690
* Author: ojab (ojab ojab)
* Status: Rejected
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: 2.4.0p0
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Since 2.4 forwarding methods to private methods is deprecated (https://bugs.ruby-lang.org/issues/12782) and `method_missing` is private one, so something like
```ruby
require 'forwardable'
class PostOffice
def method_missing(*args); end
end
class Courier
extend Forwardable
def_delegators :@post_office, :deliver
def initialize
@post_office = PostOffice.new
end
end
Courier.new.deliver
```
produces
```
/tmp/1.rb:17:in `<main>': Courier#deliver at /Users/ojab/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/forwardable.rb:156 forwarding to private method PostOffice#deliver
```
It's used by shoulda-marchers [for object doubles](https://github.com/thoughtbot/shoulda-matchers/blob/master/lib/shoulda/matchers/doublespeak/object_double.rb).
This bug is created to know if such usage is really deprecated and will break in the future or `method_missing` is a special case that will be supported.
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