[ruby-core:118514] [Ruby master Bug#20620] singleton_method undefined for module using "extend self"
Issue #20620 has been reported by dentarg (Patrik Ragnarsson). ---------------------------------------- Bug #20620: singleton_method undefined for module using "extend self" https://bugs.ruby-lang.org/issues/20620 * Author: dentarg (Patrik Ragnarsson) * Status: Open * ruby -v: ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Is this a bug? I expected `ExtendSelf.singleton_method(:foo)` to work when `ExtendSelf.singleton_methods` worked and `:foo` was in the list returned. ```ruby # singleton_method.rb class Klass def self.foo end end module ExtendSelf extend self def foo end end p RUBY_DESCRIPTION p "Klass" p Klass.singleton_methods # => [:foo] p Klass.singleton_method(:foo) # => #<Method: Klass.foo() singleton_method.rb:2> p "ExtendSelf" p ExtendSelf.singleton_methods # => [:foo] p ExtendSelf.singleton_method(:foo) # => singleton_method.rb:19:in `singleton_method': undefined singleton method `foo' for `ExtendSelf' (NameError) ``` ```shell $ docker run --rm -it -v $(pwd):/app -w /app rubylang/ruby:master-nightly-jammy Unable to find image 'rubylang/ruby:master-nightly-jammy' locally master-nightly-jammy: Pulling from rubylang/ruby ... Digest: sha256:922037b184b897786a26b2460f70a66139f87dce67f20ddf760cd4186790ed9f root@9807305c322a:/app# ruby -v ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] root@9807305c322a:/app# ruby singleton_method.rb "ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux]" "Klass" [:foo] #<Method: Klass.foo() singleton_method.rb:2> "ExtendSelf" [:foo] singleton_method.rb:21:in 'Kernel#singleton_method': undefined singleton method 'foo' for 'ExtendSelf' (NameError) ``` -- https://bugs.ruby-lang.org/
Issue #20620 has been updated by jeremyevans0 (Jeremy Evans). I don't think this is a bug. It does seem inconsistent, but only because the `all` argument to `singleton_methods` defaults to true. If you call `singleton_methods(false)`, then you get the behavior you would expect from the method name (only show actual singleton methods, not methods in modules that extend the object). ---------------------------------------- Bug #20620: singleton_method undefined for module using "extend self" https://bugs.ruby-lang.org/issues/20620#change-109037 * Author: dentarg (Patrik Ragnarsson) * Status: Open * ruby -v: ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Is this a bug? I expected `ExtendSelf.singleton_method(:foo)` to work when `ExtendSelf.singleton_methods` worked and `:foo` was in the list returned. ```ruby # singleton_method.rb class Klass def self.foo end end module ExtendSelf extend self def foo end end p RUBY_DESCRIPTION p "Klass" p Klass.singleton_methods # => [:foo] p Klass.singleton_method(:foo) # => #<Method: Klass.foo() singleton_method.rb:2> p "ExtendSelf" p ExtendSelf.singleton_methods # => [:foo] p ExtendSelf.singleton_method(:foo) # => singleton_method.rb:19:in `singleton_method': undefined singleton method `foo' for `ExtendSelf' (NameError) ``` ```shell $ docker run --rm -it -v $(pwd):/app -w /app rubylang/ruby:master-nightly-jammy Unable to find image 'rubylang/ruby:master-nightly-jammy' locally master-nightly-jammy: Pulling from rubylang/ruby ... Digest: sha256:922037b184b897786a26b2460f70a66139f87dce67f20ddf760cd4186790ed9f root@9807305c322a:/app# ruby -v ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] root@9807305c322a:/app# ruby singleton_method.rb "ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux]" "Klass" [:foo] #<Method: Klass.foo() singleton_method.rb:2> "ExtendSelf" [:foo] singleton_method.rb:21:in 'Kernel#singleton_method': undefined singleton method 'foo' for 'ExtendSelf' (NameError) ``` -- https://bugs.ruby-lang.org/
Issue #20620 has been updated by matz (Yukihiro Matsumoto). I think `singleton_method` should traverse super-classes (as long as they are ICLASS) too. Probably we need to check for compatibility issues. Matz. ---------------------------------------- Bug #20620: singleton_method undefined for module using "extend self" https://bugs.ruby-lang.org/issues/20620#change-109316 * Author: dentarg (Patrik Ragnarsson) * Status: Open * ruby -v: ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Is this a bug? I expected `ExtendSelf.singleton_method(:foo)` to work when `ExtendSelf.singleton_methods` worked and `:foo` was in the list returned. ```ruby # singleton_method.rb class Klass def self.foo end end module ExtendSelf extend self def foo end end p RUBY_DESCRIPTION p "Klass" p Klass.singleton_methods # => [:foo] p Klass.singleton_method(:foo) # => #<Method: Klass.foo() singleton_method.rb:2> p "ExtendSelf" p ExtendSelf.singleton_methods # => [:foo] p ExtendSelf.singleton_method(:foo) # => singleton_method.rb:19:in `singleton_method': undefined singleton method `foo' for `ExtendSelf' (NameError) ``` ```shell $ docker run --rm -it -v $(pwd):/app -w /app rubylang/ruby:master-nightly-jammy Unable to find image 'rubylang/ruby:master-nightly-jammy' locally master-nightly-jammy: Pulling from rubylang/ruby ... Digest: sha256:922037b184b897786a26b2460f70a66139f87dce67f20ddf760cd4186790ed9f root@9807305c322a:/app# ruby -v ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] root@9807305c322a:/app# ruby singleton_method.rb "ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux]" "Klass" [:foo] #<Method: Klass.foo() singleton_method.rb:2> "ExtendSelf" [:foo] singleton_method.rb:21:in 'Kernel#singleton_method': undefined singleton method 'foo' for 'ExtendSelf' (NameError) ``` -- https://bugs.ruby-lang.org/
Issue #20620 has been updated by jeremyevans0 (Jeremy Evans). I submitted a pull request to implement this: https://github.com/ruby/ruby/pull/11605 In terms of compatibility issues: * For singleton classes that prepend a module, and have the method defined in both the singleton class and prepended module, `singleton_method` now returns the method in the prepended module. * Cases where a method is defined in a module prepended to or included in the singleton classes and not in the singleton class itself now result in a `Method` Object being returned, instead of raising `NameError`. Use of `singleton_method` isn't that common in my experience, so I think we should make the change. There is still time to back it out of 3.4 if it causes issues. ---------------------------------------- Bug #20620: singleton_method undefined for module using "extend self" https://bugs.ruby-lang.org/issues/20620#change-109727 * Author: dentarg (Patrik Ragnarsson) * Status: Open * ruby -v: ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Is this a bug? I expected `ExtendSelf.singleton_method(:foo)` to work when `ExtendSelf.singleton_methods` worked and `:foo` was in the list returned. ```ruby # singleton_method.rb class Klass def self.foo end end module ExtendSelf extend self def foo end end p RUBY_DESCRIPTION p "Klass" p Klass.singleton_methods # => [:foo] p Klass.singleton_method(:foo) # => #<Method: Klass.foo() singleton_method.rb:2> p "ExtendSelf" p ExtendSelf.singleton_methods # => [:foo] p ExtendSelf.singleton_method(:foo) # => singleton_method.rb:19:in `singleton_method': undefined singleton method `foo' for `ExtendSelf' (NameError) ``` ```shell $ docker run --rm -it -v $(pwd):/app -w /app rubylang/ruby:master-nightly-jammy Unable to find image 'rubylang/ruby:master-nightly-jammy' locally master-nightly-jammy: Pulling from rubylang/ruby ... Digest: sha256:922037b184b897786a26b2460f70a66139f87dce67f20ddf760cd4186790ed9f root@9807305c322a:/app# ruby -v ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] root@9807305c322a:/app# ruby singleton_method.rb "ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux]" "Klass" [:foo] #<Method: Klass.foo() singleton_method.rb:2> "ExtendSelf" [:foo] singleton_method.rb:21:in 'Kernel#singleton_method': undefined singleton method 'foo' for 'ExtendSelf' (NameError) ``` -- https://bugs.ruby-lang.org/
Issue #20620 has been updated by matz (Yukihiro Matsumoto). @jeremyevans0 Thank you. Let us merge the pull-request, and experiment with the preview. Matz. ---------------------------------------- Bug #20620: singleton_method undefined for module using "extend self" https://bugs.ruby-lang.org/issues/20620#change-110035 * Author: dentarg (Patrik Ragnarsson) * Status: Open * ruby -v: ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Is this a bug? I expected `ExtendSelf.singleton_method(:foo)` to work when `ExtendSelf.singleton_methods` worked and `:foo` was in the list returned. ```ruby # singleton_method.rb class Klass def self.foo end end module ExtendSelf extend self def foo end end p RUBY_DESCRIPTION p "Klass" p Klass.singleton_methods # => [:foo] p Klass.singleton_method(:foo) # => #<Method: Klass.foo() singleton_method.rb:2> p "ExtendSelf" p ExtendSelf.singleton_methods # => [:foo] p ExtendSelf.singleton_method(:foo) # => singleton_method.rb:19:in `singleton_method': undefined singleton method `foo' for `ExtendSelf' (NameError) ``` ```shell $ docker run --rm -it -v $(pwd):/app -w /app rubylang/ruby:master-nightly-jammy Unable to find image 'rubylang/ruby:master-nightly-jammy' locally master-nightly-jammy: Pulling from rubylang/ruby ... Digest: sha256:922037b184b897786a26b2460f70a66139f87dce67f20ddf760cd4186790ed9f root@9807305c322a:/app# ruby -v ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux] root@9807305c322a:/app# ruby singleton_method.rb "ruby 3.4.0dev (2024-07-08T21:43:28Z master e500222de1) [x86_64-linux]" "Klass" [:foo] #<Method: Klass.foo() singleton_method.rb:2> "ExtendSelf" [:foo] singleton_method.rb:21:in 'Kernel#singleton_method': undefined singleton method 'foo' for 'ExtendSelf' (NameError) ``` -- https://bugs.ruby-lang.org/
participants (3)
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dentarg (Patrik Ragnarsson) -
jeremyevans0 (Jeremy Evans)
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matz (Yukihiro Matsumoto)