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Bug #15608

Updated by Eregon (Benoit Daloze) almost 6 years ago

bug.rb: 
 ```ruby 
 class C 
   def foo 
   end 
 end 

 obj = C.new 

 class << obj 
   alias bar foo 
 end 

 p obj.method(:foo).owner 
 p obj.method(:foo) 
 raise unless obj.method(:foo).owner == C 

 p obj.method(:bar).owner 
 p obj.method(:bar) 
 raise unless obj.method(:bar).owner == obj.singleton_class 
 ``` 

 ``` 
 $ chruby 2.0.0 
 $ ruby -v bug.rb  
 ruby 2.0.0p648 (2015-12-16) [x86_64-linux] 
 C 
 #<Method: C#foo> 
 #<Class:#<C:0x0055b39fcd2c30>> 
 #<Method: C(C)#foo> 

 $ chruby 2.3.8 
 $ ruby -v bug.rb  
 ruby 2.3.8p459 (2018-10-18 revision 65136) [x86_64-linux] 
 C 
 #<Method: C#foo> 
 #<Class:#<C:0x000055668ebef268>> 
 #<Method: #<C:0x000055668ebef268>.bar(foo)> 

 $ chruby 2.4.5 
 $ ruby -v bug.rb  
 ruby 2.4.5p335 (2018-10-18 revision 65137) [x86_64-linux] 
 C 
 #<Method: #<C:0x000055fdc99dc908>.foo> 
 #<Class:#<C:0x000055fdc99dc908>> 
 #<Method: #<C:0x000055fdc99dc908>.bar(foo)> 

 Same for 2.5.3 and 2.6.1 
 ``` 

 I think Method#inspect should show on which Module the method is defined (`Method#owner`), defined, and only singleton methods should be shown as `receiver.method`, so: 
 ``` 
 C 
 #<Method: C#foo> 
 #<Class:#<C:0x000055668ebef268>> 
 #<Method: #<C:0x000055668ebef268>.bar(foo)> 
 ``` 

 Which only Ruby 2.3 does interestingly. 

 --- 

 What's the meaning of the `C1(C2)` notation? 

 It seems to show `"#{receiver.class}(#{owner})` or `"#{receiver.singleton_class if receiver has a sclass}(#{owner})` depending on the version: 
 ```ruby 
 class D < C 
 end 
 d = D.new 
 p d.method(:foo) 
 d.singleton_class 
 p d.method(:foo) 
 ``` 

 ``` 
 2.0-2.3: 
 #<Method: D(C)#foo> 
 #<Method: D(C)#foo> 
 2.4-2.6: 
 #<Method: D(C)#foo> 
 #<Method: #<D:0x000055c12b45e218>.foo> 
 ``` 

 I think the Ruby 2.4+ behavior is confusing and incorrect here, the object shouldn't be shown if it's not a singleton method, and Method#inspect shouldn't change for a given method. 

 Do you agree what I describe should be the correct behavior? 
 Can we fix it then?

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