[ruby-core:107726] [Ruby master Bug#18600] Aliased method visibility issue on Ruby 3.1

Issue #18600 has been updated by jeremyevans0 (Jeremy Evans).


I've submitted a pull request to fix this: https://github.com/ruby/ruby/pull/5592

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Bug #18600: Aliased method visibility issue on Ruby 3.1
https://bugs.ruby-lang.org/issues/18600#change-96649

* Author: gmcgibbon (Gannon McGibbon)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0
* Backport: 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONTNEED, 3.1: REQUIRED
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It seems methods on classes that were originally private in the parent and made public in the child can no longer be aliased correctly:

```
class C
  public :system
  alias_method :bar, :system
  alias_method :system, :bar
end

p RUBY_VERSION
p [C.new.respond_to?(:system), C.new.respond_to?(:system, true)]
```

On Ruby <= 3.0.3, this returns `[true, true]`, but on Ruby >= 3.1.0 this returns `[false, true]`. The aliased method seems to revert visibility to the parent.



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