[ruby-core:121430] [Ruby Bug#21196] Ruby 3.4 ignores visibility when passing arguments using `...`

Issue #21196 has been updated by tenderlovemaking (Aaron Patterson).

Assignee set to tenderlovemaking (Aaron Patterson)
Backport changed from 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED

----------------------------------------
Bug #21196: Ruby 3.4 ignores visibility when passing arguments using `...`
https://bugs.ruby-lang.org/issues/21196#change-112410

* Author: toy (Ivan Kuchin)
* Status: Open
* Assignee: tenderlovemaking (Aaron Patterson)
* ruby -v: ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED
----------------------------------------
If method is passing arguments using `...`, then receiver visibility gets ignored if once called without receiver:

```ruby
class A
private

  def foo = :foo
  def bar = :bar
end

class B
  def initialize(o)
    @o = o
  end

  def foo(...) = @o.foo(...)
  def bar = @o.bar

  def internal_foo = foo
  def internal_bar = bar
end

def try
  p yield
rescue => e
  p e
end
```
If `foo` is called first without receiver through `internal_foo`:
```ruby
b = B.new(A.new)

try{ b.internal_foo }
try{ b.internal_bar }
try{ b.foo }
try{ b.bar }
```
Visibility of `A#foo` gets ignored:
```
ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [x86_64-linux]
:foo
#<NoMethodError: private method 'bar' called for an instance of A>
:foo
#<NoMethodError: private method 'bar' called for an instance of A>
```
```
ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
#<NoMethodError: private method `foo' called for an instance of A>
#<NoMethodError: private method `bar' called for an instance of A>
#<NoMethodError: private method `foo' called for an instance of A>
#<NoMethodError: private method `bar' called for an instance of A>
```

If `internal_foo` is not called before `foo`:

```ruby
b = B.new(A.new)

try{ b.foo }
try{ b.bar }
```
Visibility of `A#foo` gets checked:
```
ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [x86_64-linux]
#<NoMethodError: private method 'foo' called for an instance of A>
#<NoMethodError: private method 'bar' called for an instance of A>
```
```
ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
#<NoMethodError: private method `foo' called for an instance of A>
#<NoMethodError: private method `bar' called for an instance of A>
```




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