HTTP/2 200 x-amz-id-2: 50aNXnoVRY6uV7UUXW6MXDRbzrL4MfRPAaqj4yWPbLWMFBJnhLY9AtG1Qs3H7qmR4kZOYU5cnFs= x-amz-request-id: 4CV99ZTTD95TR4TJ last-modified: Thu, 15 May 2025 23:41:00 GMT etag: "4daf0c605571d66e9822d8d33bcdef69" x-amz-server-side-encryption: AES256 server: AmazonS3 content-encoding: gzip via: 1.1 varnish, 1.1 varnish content-type: text/plain; charset=utf-8 accept-ranges: bytes age: 0 date: Wed, 23 Jul 2025 20:01:48 GMT x-served-by: cache-tyo11922-TYO, cache-bom-vanm7210073-BOM x-cache: MISS, MISS x-cache-hits: 0, 0 x-timer: S1753300908.075510,VS0,VE465 vary: Accept-Encoding content-length: 737 From: "jhawthorn (John Hawthorn) via ruby-core" Date: 2025-05-15T23:35:02+00:00 Subject: [ruby-core:122132] [Ruby Bug#21343] Namespace: singleton classes of root namespace leak between namespaces Issue #21343 has been reported by jhawthorn (John Hawthorn). ---------------------------------------- Bug #21343: Namespace: singleton classes of root namespace leak between namespaces https://bugs.ruby-lang.org/issues/21343 * Author: jhawthorn (John Hawthorn) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Ruby classes all have singleton classes, those singleton classes have singleton classes, and so on with infinite nesting. Since we don't have infinite resources, we create these lazily. Because of this, only a certain number of singleton classes exist in the root namespace. At a certain depth, mutable singleton classes end up shared between namespaces. ``` ruby File.write("/tmp/ntest.rb", <<~'RUBY') p String.singleton_class.singleton_class::Foo String.singleton_class.singleton_class::Bar = 456 RUBY String.singleton_class.singleton_class::Foo = 123 ns = Namespace.new ns.require("/tmp/ntest.rb") p String.singleton_class.singleton_class::Bar ``` ``` RUBY_NAMESPACE=1 ruby nstest2.rb ruby: warning: Namespace is experimental, and the behavior may change in the future! See doc/namespace.md for known issues, etc. 123 456 ``` -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/