From: ko1@...
Date: 2015-12-21T10:34:23+00:00
Subject: [ruby-core:72420] [Ruby trunk - Bug #11740] [Assigned] ObjectSpace.each_object exposes internal metaclasses

Issue #11740 has been updated by Koichi Sasada.

Status changed from Closed to Assigned

This patch breaks rubyspec.

```
1)
ObjectSpace.each_object walks a class and its normal descendants when passed the class's singleton class FAILED
Expected [#<Class:0x00000001860d98>,
 #<Class:0x00000001860de8>,
 #<Class:0x00000001860e38>,
 #<Class:0x00000001860e88>]
to equal [#<Class:#<#<Class:0x00000001860de8>:0x00000001860d20>>,
 #<Class:0x00000001860d98>,
 #<Class:0x00000001860de8>,
 #<Class:0x00000001860e38>,
 #<Class:0x00000001860e88>]

/mnt/sdb1/ruby/trunk/spec/rubyspec/core/objectspace/each_object_spec.rb:222:in `block (2 levels) in <top (required)>'
/mnt/sdb1/ruby/trunk/spec/rubyspec/core/objectspace/each_object_spec.rb:4:in `<top (required)>'

2)
ObjectSpace.each_object on singleton classes walks singleton classes FAILED
Expected [#<Class:0x0000000189a958>]
```

Maybe I missed some points.
Any idea?

----------------------------------------
Bug #11740: ObjectSpace.each_object exposes internal metaclasses
https://bugs.ruby-lang.org/issues/11740#change-55710

* Author: Benoit Daloze
* Status: Assigned
* Priority: Normal
* Assignee: Koichi Sasada
* ruby -v: ruby 2.3.0dev (2015-11-19 trunk 52672) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
ObjectSpace.each_object exposes internal metaclasses and
this might result in assumptions being violated since the metaclass structure is not well preserved.

See the attached script for an example.
The #bla method should always be defined on the metaclass of "klass".

See https://bugs.ruby-lang.org/issues/11360#note-2 as well in which I warned against this problem ;)

---Files--------------------------------
objspace_expose_intern_meta.rb (413 Bytes)


-- 
https://bugs.ruby-lang.org/