[ruby-core:114899] [Ruby master Bug#19749] Confirm correct behaviour when attaching private method with `#define_method`

Issue #19749 has been updated by jeremyevans0 (Jeremy Evans).


@matz This was reviewed during the August 2023 developer meeting and is still waiting for your reply.

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Bug #19749: Confirm correct behaviour when attaching private method with `#define_method`
https://bugs.ruby-lang.org/issues/19749#change-104764

* Author: itarato (Peter Arato)
* Status: Open
* Priority: Normal
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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This issue is a special case of https://bugs.ruby-lang.org/issues/19745:

Should dynamically added private methods via `.singleton_class.send(:define_method,...` at the top-level be accessible publicly?

See the following example:

```ruby
def bar; end

foo = Object.new
foo.singleton_class.define_method(:bar, method(:bar))

foo.bar # No error.
```

The script above runs fine on latest Ruby 3.3. Is this correct to ignore the fact that the visibility in the caller context is the default top-level private visibility?

This came up during a TruffleRuby investigation (https://github.com/oracle/truffleruby/issues/3134) where the result for the same script is: `private method 'bar' called for #<Object:0xc8> (NoMethodError)`




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