Issue #13144 has been reported by Richard Viney.

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Bug #13144: prettyprint doesn't detect cycles when wrapped inside Delegators
https://bugs.ruby-lang.org/issues/13144

* Author: Richard Viney
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.4.0
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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The line count of the pretty print output for the following class grows factorially with the number of self-referencing SimpleDelegator instances created by the initializer. With an n of 8 the line count of the pretty print output is almost one million! This occurs because the cycle detection in lib/pp.rb doesn't detect the already printed object due to it being wrapped inside a Delegator instance. The same problem occurs with pretty printing cycles wrapped inside WeakRef because it is a subclass of Delegator.

class Foo
  def initialize(n)
    n.times { |i| instance_variable_set "@a#{i}", SimpleDelegator.new(self) }
  end
end



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