From: "alanwu (Alan Wu)" <noreply@...>
Date: 2022-12-01T16:56:54+00:00
Subject: [ruby-core:111131] [Ruby master Bug#19166] Module#remove_method can change frozen modules when there is a prepended module

Issue #19166 has been reported by alanwu (Alan Wu).

----------------------------------------
Bug #19166: Module#remove_method can change frozen modules when there is a prepended module
https://bugs.ruby-lang.org/issues/19166

* Author: alanwu (Alan Wu)
* Status: Open
* Priority: Normal
* ruby -v: 2.7, 3.0, 3.1, dev
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
```ruby
module A
  prepend Module.new # remove this line and you'd get FrozenError as expected
  def foo; end
  freeze
  remove_method :foo # remove works even though module is frozen!
  p instance_methods(false) # => []
end
```

Old bug, reproduces in 2.7 through 3.1 and on master. Found while investigating #19164.



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