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Bug #13264
closedBinding#irb does not work in context of frozen object
Description
This works as expected (starts IRB):
$ ruby -r irb -e '"".instance_eval{ binding.irb }'
This throws an error:
$ ruby -r irb -e '"".freeze.instance_eval{ binding.irb }'
/home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb/extend-command.rb:199:in `extend_object': can't define singleton (TypeError)
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:413:in `extend'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:413:in `initialize'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:713:in `new'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:713:in `irb'
from -e:1:in `block in <main>'
from -e:1:in `instance_eval'
from -e:1:in `<main>'
Also fails, but slightly different error:
ruby -r irb -e 'Object.new.freeze.instance_eval{ binding.irb }'
/home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb/extend-command.rb:200:in `extend_object': can't modify frozen object (RuntimeError)
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb/extend-command.rb:200:in `extend_object'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:413:in `extend'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:413:in `initialize'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:713:in `new'
from /home/jan/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/irb.rb:713:in `irb'
from -e:1:in `block in <main>'
from -e:1:in `instance_eval'
from -e:1:in `<main>'
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