From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2013-09-07T04:02:00+09:00
Subject: [ruby-core:57049] [ruby-trunk - Bug #8870] Method-Missing breaking	irb


Issue #8870 has been updated by nobu (Nobuyoshi Nakada).


Array#flatten tries to call #to_ary method on non-Array arguments, but the result of `m.to_s' doesn't have it, so the method_missing is called, and continues infinitely.

In short, do not redefine global method_missing method.

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Bug #8870: Method-Missing breaking irb
https://bugs.ruby-lang.org/issues/8870#change-41654

Author: bjhaid (Ayodele Abejide)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


2.0.0p247 :001 > def method_missing m,*args; [m.to_s,args].flatten.join " "; end
 => nil
2.0.0p247 :002 > "j".happy "hh"
 
2.0.0p247 :001 > def method_missing *args; args.join " "; end
 => nil
2.0.0p247 :002 > "j".happy
SystemStackError: stack level too deep
  from /Users/bjhaid/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/irb/workspace.rb:86
Maybe IRB bug!
 
2.0.0p247 :003 > def method_missing m,*args; args.join " "; end
Segmentation fault: 11
 
2.0.0p247 :001 > def method_missing m,*args; [m,args].flatten " "; end
 => nil
2.0.0p247 :002 > "j".happy hah
Segmentation fault: 11


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