[ruby-core:107723] [Ruby master Bug#18600] Aliased method visibility issue on Ruby 3.1

Issue #18600 has been updated by gmcgibbon (Gannon McGibbon).


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. May be related to https://github.com/ruby/ruby/pull/4149.

----------------------------------------
Bug #18600: Aliased method visibility issue on Ruby 3.1
https://bugs.ruby-lang.org/issues/18600#change-96645

* Author: gmcgibbon (Gannon McGibbon)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
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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