Issue #21873 has been updated by mdalessio (Mike Dalessio). A potential fix for this might be: ```diff diff --git a/proc.c b/proc.c index f0cdcae7..67963a1b 100644 --- a/proc.c +++ b/proc.c @@ -2006,6 +2006,8 @@ method_eq(VALUE method, VALUE other) klass1 = method_entry_defined_class(m1->me); klass2 = method_entry_defined_class(m2->me); + if (RB_TYPE_P(klass1, T_ICLASS)) klass1 = RBASIC_CLASS(klass1); + if (RB_TYPE_P(klass2, T_ICLASS)) klass2 = RBASIC_CLASS(klass2); if (!rb_method_entry_eq(m1->me, m2->me) || klass1 != klass2 || ``` ---------------------------------------- Bug #21873: `UnboundMethod#==` returns false for methods obtained via extend + unbind https://bugs.ruby-lang.org/issues/21873#change-116343 * Author: mdalessio (Mike Dalessio) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- ## Description `UnboundMethod#==` returns `false` when comparing a module's instance method against the same method obtained via `Method#unbind` on a class that includes or extends that module, despite having the same owner and source location. ```ruby module MyMethods def hello = "hello" end class Base extend MyMethods end from_module = MyMethods.instance_method(:hello) from_unbind = Base.method(:hello).unbind p from_module.owner == from_unbind.owner #=> true p from_module.source_location == from_unbind.source_location #=> true p from_module.inspect == from_unbind.inspect #=> true p from_module == from_unbind #=> false (expected true) ``` ## Diagnosis `method_eq` compares method entries using `method_entry_defined_class`. For methods mixed in via `include`/`extend`, the "defined class" will be an ICLASS and not the original class/module. In the example above, `method_eq` is comparing a module's ICLASS entry against the module, and that will always be false. Related: #18798 (fixed by @ko1 in 59e389af). -- https://bugs.ruby-lang.org/