From: shyouhei@...
Date: 2017-04-17T09:33:53+00:00
Subject: [ruby-core:80736] [Ruby trunk Bug#13264][Assigned] Binding#irb does not work in context of frozen object

Issue #13264 has been updated by shyouhei (Shyouhei Urabe).

Status changed from Open to Assigned
Assignee set to nobu (Nobuyoshi Nakada)

----------------------------------------
Bug #13264: Binding#irb does not work in context of frozen object
https://bugs.ruby-lang.org/issues/13264#change-64291

* Author: rbjl (Jan Lelis)
* Status: Assigned
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
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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