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Class does not inherit singleton_class's class methods #287

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kachick opened this Issue Sep 5, 2012 · 8 comments

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kachick commented Sep 5, 2012

I have faced a different behavior with MRI/YARV.
Is this expected?

set up

class Foo
  class << self
    class << self
      def foo; end
    end
  end
end

class Bar < Foo; end

Bar.singleton_class.foo

MRI/YARV

ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux]

Bar.singleton_class.foo #=> nil

JRuby

jruby 1.7.0.preview2 (1.9.3p203) 2012-09-03 b37a0bd on Java HotSpot(TM) Server VM 1.7.0_07-b10 [linux-i386]

Bar.singleton_class.foo #=> NoMethodError: undefined method `foo' for #<Class:Bar>
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the8472 commented Dec 10, 2012

I think I've run into a related issue, in my case with a module that gets included into another module that extends the a class's singleton class

see https://gist.github.com/4240807

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rjnienaber commented May 5, 2015

This still seems to be an issue in JRuby 1.7.20 and JRuby HEAD:

----------
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-darwin14.0.0]
nil
----------
jruby 1.7.20 (1.9.3p551) 2015-05-04 3086e6a on Java HotSpot(TM) 64-Bit Server VM 1.8.0_05-b13 +jit [darwin-x86_64]
NoMethodError: undefined method `foo' for #<Class:Bar>
  (root) at /tmp/test.rb:11
==========
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
nil
----------
jruby 9.0.0.0-SNAPSHOT (2.2.2) 2015-05-05 c0d9bc3 Java HotSpot(TM) 64-Bit Server VM 25.5-b02 on 1.8.0_05-b13 +jit [darwin-x86_64]
NoMethodError: undefined method `foo' for #<Class:Bar>
  method_missing at org/jruby/RubyBasicObject.java:1606
           <top> at /tmp/test.rb:11
----------

eregon added a commit that referenced this issue Aug 22, 2016

Squashed 'spec/ruby/' changes from b6baa6d..ffdfa41
ffdfa41 fix spec description
763e265 Fix double close in ARGF#read_nonblock spec
34d5bd1 Do not expect stdin to be the standard one in ARGF#read_nonblock
6a4a506 Remove stale comment
d23843f Merge pull request #289 from nobu/bug/fix-spawn
acf7634 ruby_cmd for spawn
6ef8ffc AppVeyor: run on every branch
705f41f windows guard fox unix sockets
ee7ff0e Do not guess a free port but use find_available_port
5258c31 Merge pull request #287 from etehtsea/add-inspec-sockaddr
4ee1776 Correctly pass interpreter arguments and flags in Process#kill specs
bb0c704 Remove most usages of RUBY_EXE and replace by ruby_cmd
22f9a5b Use ruby_cmd instead of RUBY_EXE in popen specs
1f85144 Fix a couple specs assuming RUBY_EXE is only a path without flags
ea5303a Share a few #spawn specs and use ruby_cmd over RUBY_EXE
721e379 Add Addrinfo#inspect_sockaddr spec
981a6e7 Windows seems to pack socket options in a short
0416004 join thread in ObjectSpace.each_object
e061bfe Add windows guard for lgamma
4864e06 Add a few windows guards
d2656bc Some environments seem to not fill the cannoname

git-subtree-dir: spec/ruby
git-subtree-split: ffdfa41f12ce35e1c91dab3a72b95edf4020b3ea
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rcrews commented Feb 21, 2018

Just ran the above test case with 9.1.16.0. Can this be closed?

15:48:59 ~ 🐾  irb
jruby-9.1.16.0 :001 > class Foo
jruby-9.1.16.0 :002?>     class << self
jruby-9.1.16.0 :003?>         class << self
jruby-9.1.16.0 :004?>             def foo; end
jruby-9.1.16.0 :005?>           end
jruby-9.1.16.0 :006?>       end
jruby-9.1.16.0 :007?>   end
 => :foo 
jruby-9.1.16.0 :008 >   class Bar < Foo; end
 => nil 
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kares commented Feb 22, 2018

closing - especially since it was reported against 1.7 which is EOL. thanks @rcrews

@kares kares closed this Feb 22, 2018

@kares kares added this to the Invalid or Duplicate milestone Feb 22, 2018

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prashantvithani commented Aug 23, 2018

@kares This issue still persists in 9.2.0.0

jruby-9.2.0.0 :015 > class Foo
jruby-9.2.0.0 :016?>     class << self
jruby-9.2.0.0 :017?>         class << self
jruby-9.2.0.0 :018?>             def foo; end
jruby-9.2.0.0 :019?>           end
jruby-9.2.0.0 :020?>       end
jruby-9.2.0.0 :021?>   end
 => :foo 
jruby-9.2.0.0 :022 > 
jruby-9.2.0.0 :023 > class Bar < Foo; end
 => nil 
jruby-9.2.0.0 :024 > Foo.singleton_class.foo
 => nil 
jruby-9.2.0.0 :025 > Bar.singleton_class.foo
Traceback (most recent call last):
        7: from /Users/prvithani/.rvm/rubies/jruby-9.2.0.0/bin/irb:13:in `<main>'
        6: from org/jruby/RubyKernel.java:1180:in `catch'
        5: from org/jruby/RubyKernel.java:1180:in `catch'
        4: from org/jruby/RubyKernel.java:1418:in `loop'
        3: from org/jruby/RubyKernel.java:1037:in `eval'
        2: from (irb):25:in `<eval>'
        1: from org/jruby/RubyBasicObject.java:1720:in `method_missing'
NoMethodError (undefined method `foo' for #<Class:Bar>)
jruby-9.2.0.0 :026 > 

@kares kares reopened this Aug 24, 2018

@lokeshdevnani

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lokeshdevnani commented Aug 24, 2018

@prashantvithani @kares Facing the same issue

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headius commented Sep 19, 2018

This appears to be working in 9.2.1.0. I'm trying to confirm what commit fixed it.

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headius commented Sep 19, 2018

Nevermind...I forgot the original script does not include the failing line. I'll edit it so we don't make the same mistake.

@kares kares self-assigned this Oct 30, 2018

kares added a commit to kares/jruby that referenced this issue Oct 31, 2018

[fix] singleton_class.singleton_class chain to follow super
... class of class' singleton class

an old issue that existed all the way back in JRuby 1.7 (jrubyGH-287)

@enebo enebo closed this in #5394 Nov 1, 2018

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