[ruby-core:67978] [ruby-trunk - Bug #10765] [Assigned] Module#remove_method remove refined method entry.

Issue #10765 has been updated by Vit Ondruch.

Status changed from Closed to Assigned

This breaks CentOS7, OpenSuse and Fedora at minimum:

http://rubyci.blob.core.windows.net/opensuse13/ruby-trunk/log/20150203T123003Z.log.html.gz
http://rubyci.blob.core.windows.net/fedora20/ruby-trunk/log/20150203T110002Z.log.html.gz
http://rubyci.blob.core.windows.net/centos7/ruby-trunk/log/20150203T110002Z.log.html.gz

~~~
/home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:60:in `remove_method': method `to_json' not defined in Hash (NameError)
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:60:in `block (3 levels) in generator='
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:59:in `each'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:59:in `block (2 levels) in generator='
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:58:in `class_eval'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:58:in `block in generator='
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:55:in `each'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/common.rb:55:in `generator='
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/ext.rb:17:in `<module:Ext>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/ext.rb:12:in `<module:JSON>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json/ext.rb:9:in `<top (required)>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json.rb:58:in `<module:JSON>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/.ext/common/json.rb:54:in `<top (required)>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/json/setup_variant.rb:10:in `<top (required)>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/json/test_json.rb:5:in `<top (required)>'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/lib/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:826:in `block in non_options'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:820:in `each'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:820:in `non_options'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:63:in `process_args'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:101:in `process_args'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:962:in `process_args'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:967:in `run'
	from /home/hsbt/chkbuild/tmp/build/20150203T110002Z/ruby/test/lib/test/unit.rb:974:in `run'
	from ./test/runner.rb:40:in `<main>'
gmake: *** [yes-test-all] Error 1
exit 2
~~~

----------------------------------------
Bug #10765: Module#remove_method remove refined method entry.
https://bugs.ruby-lang.org/issues/10765#change-51367

* Author: Seiei Higa
* Status: Assigned
* Priority: Normal
* Assignee: Shugo Maeda
* ruby -v: ruby 2.3.0dev (2015-01-21 trunk 49326) [x86_64-darwin14]
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED, 2.2: REQUIRED
----------------------------------------
`Module#remove_method` should raise a `NameError`
if method is not defined in refined class, such as [`undef`](https://bugs.ruby-lang.org/issues/8966).
But if method is defined in refined class, `Module#remove_method` should keep refined method and remove original method.

I confirmed by following examples in ruby-trunk, 2.2.0, 2.1.5, 2.0.0-p598

``` ruby
class C
  def foo
    "C#foo"
  end
end

module RefinementBug
  refine C do
    def foo
      "RefinementBug#foo"
    end
  end
end

using RefinementBug

class C
  remove_method :foo
end

puts C.new.foo

# expected:
#   RefinementBug#foo
#
# actual:
#   bug.rb:21:in `<main>': undefined method `foo' for #<C:0x007f9e5c087b48> (NoMethodError)
```

``` ruby
class C
end

module RefinementBug
  refine C do
    def foo
    end
  end
end

using RefinementBug

class C
  remove_method :foo
end

# expected:
#   bug2.rb:14:in `remove_method': method `foo' not defined in C (NameError)
#   from bug2.rb:14:in `<class:C>'
#   from bug2.rb:13:in `<main>'
#
# actual:
#   # => nothing raised.
```

---Files--------------------------------
bug2.rb (327 Bytes)
bug.rb (342 Bytes)
0001-vm_method.c-fix-remove-refined-method.patch (2.68 KB)


-- 
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