Ruby » Ruby master

Bug #13762

Updated by nobu (Nobuyoshi Nakada) over 7 years ago

Given this code: 

 ```ruby ``` 
 # frozen_string_literal: true 

 class MyProxy < BasicObject 
   def initialize(target) 
     @target = target 
   end 

   undef_method :== 

   def method_missing(method_name, *args, &block) 
     if target_respond_to?(method_name) 
       @target.__send__(method_name, *args, &block) 
     else 
       ::Object 
         .instance_method(method_name) 
         .bind(@target) 
         .call(*args, &block) 
     end 
   end 

   private 

   def target_respond_to?(method_name) 
     ::Object 
       .instance_method(:respond_to?) 
       .bind(@target) 
       .call(method_name, true) 
   end 
 end 

 puts 'a' == MyProxy.new('a') 
 puts MyProxy.new('a') == 'a' 
 puts MyProxy.new('a') == MyProxy.new('a') 
 ``` 

 The output differs depending on the Ruby version: 

 ``` 
 $ chruby 2.3.4 
 $ ruby test.rb 
 true 
 true 
 true 
 $ chruby 2.4.1 
 $ ruby test.rb 
 false 
 true 
 false 
 ```

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