[ruby-core:95324] [Ruby master Bug#16250] IRB can't print recursive Arrays or Hashes

[takashikkbn@gmail.com]

Issue #16250 has been updated by k0kubun (Takashi Kokubun).


Great catch, thanks!

> By the way, I had to create a new account to report this bug. I already tried to reset my password for account asterite@gmail.com but after I reset it if I try to login it always says the password is incorrect. Could you try verifying "reset password" works fine?

I'm not familiar with it so much. Please file another ticket somewhere, maybe https://github.com/ruby/bugs.ruby-lang.org/issues?

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Bug #16250: IRB can't print recursive Arrays or Hashes
https://bugs.ruby-lang.org/issues/16250#change-82032

* Author: the-asterite (Ary Borenszweig)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-06-04 trunk 4b7213a85a) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This is on Ruby 2.7.0dev but I'm almost sure it happens on master because this code has no check for recursion: https://github.com/ruby/ruby/blob/c3a626030235c0349e14c6bc07177810daee841c/lib/irb/color.rb#L73-L88

Code to reproduce:

~~~
$ irb
irb(main):001:0> a = []
=> []
irb(main):002:0> a << a
Traceback (most recent call last):
       16: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
       15: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `block in inspect_colorable?'
       14: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `inspect_colorable?'
       13: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
       12: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `block in inspect_colorable?'
       11: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `inspect_colorable?'
       10: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
        9: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `block in inspect_colorable?'
        8: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `inspect_colorable?'
        7: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
        6: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `block in inspect_colorable?'
        5: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `inspect_colorable?'
        4: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
        3: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `block in inspect_colorable?'
        2: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `inspect_colorable?'
        1: from /Users/asterite/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/irb/color.rb:80:in `all?'
SystemStackError (stack level too deep)
Maybe IRB bug!
~~~

Suggested fix: keep a list of visited arrays and hashes. I will try to submit a patch.



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