From: Peter Vanbroekhoven <calamitates@...>
Date: 2011-10-23T20:39:06+09:00
Subject: [ruby-core:40287] [ruby-trunk - Bug #5473][Open] Raise in method_missing causes infinite loop


Issue #5473 has been reported by Peter Vanbroekhoven.

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Bug #5473: Raise in method_missing causes infinite loop
http://redmine.ruby-lang.org/issues/5473

Author: Peter Vanbroekhoven
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.3dev (2011-10-11 revision 33457) [i386-darwin9.8.0]


The following code causes an infinite loop:

  class ::Object
  
    def method_missing(m, *a, &b)
      raise ArgumentError.new("haha")
    end
  
  end

  1.foo

This is due to the raise calling to_str on the exception, which isn't defined. So a method_missing that also covers the Exception class and that contains a raise (at least the version with one argument) causes an infinite loop.

I'm a bit hesitant to call this a bug, except that the pattern above happened in code that works on Ruby 1.8 and breaks on 1.9.


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