[ruby-core:95318] [Ruby master Bug#16250] IRB can't print recursive Arrays or Hashes

Issue #16250 has been reported by the-asterite (Ary Borenszweig).

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

* Author: the-asterite (Ary Borenszweig)
* Status: Open
* 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
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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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