From: "charliesome (Charlie Somerville)" <charlie@...>
Date: 2012-11-06T20:12:21+09:00
Subject: [ruby-core:48970] [ruby-trunk - Bug #7290][Open] Overriding method_added on a refinement's anonymous module can cause the opt_* opcodes to behave incorrectly


Issue #7290 has been reported by charliesome (Charlie Somerville).

----------------------------------------
Bug #7290: Overriding method_added on a refinement's anonymous module can cause the opt_* opcodes to behave incorrectly
https://bugs.ruby-lang.org/issues/7290

Author: charliesome (Charlie Somerville)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: 2.0.0-preview1


Ruby stores flags in (({ruby_vm_redefined_flag})) to track whether certain methods have been redefined on particular classes. If the redefined flag for a certain class and operator is not set, Ruby will skip method lookup and directly call the method implementing that operator.

The current implementation of refinements uses the (({method_added})) callback to set these flags. If this method is overridden, the flags are not set properly.

This code should raise a RuntimeError with the message "addition is not allowed". Instead it outputs "3". If line 3 is removed, it behaves correctly.

  module Test
    refine Fixnum do
      def self.method_added(id); end
      
      def +(other)
        raise "addition is not allowed"
      end
    end
  end
 
  using Test
 
  puts 1 + 2


-- 
http://bugs.ruby-lang.org/