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`true.dup` and `false.dup` blow up (Inconsistent with MRI) #5184

aryeh-looker opened this Issue May 22, 2018 · 2 comments


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aryeh-looker commented May 22, 2018


  • jruby-
  • Mac OS X #10.13.3

Expected Behavior

# MRI 2.5.1
2.5.1 :002 > true.dup == true
 => true 

Actual Behavior

jruby- :001 > true.dup == true
TypeError: can't dup TrueClass
	from org/jruby/ `dup'
	from (irb):1:in `<eval>'
	from org/jruby/ `eval'
	from org/jruby/ `loop'
	from org/jruby/ `catch'
	from org/jruby/ `catch'
	from /Users/user/.rvm/rubies/jruby- `<main>'

@enebo enebo added this to the JRuby milestone May 22, 2018

@enebo enebo added the ruby 2.5 label May 22, 2018


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enebo commented May 22, 2018

Ruby 2.3.x displays the error reported so JRuby 9.1.x does not have this issue. Upcoming JRuby 9.2.x will support 2.5.x so it is affected.


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headius commented May 23, 2018

JRuby 9.2 appears to match Ruby 2.5 behavior here.

@headius headius closed this May 23, 2018

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