[ruby-core:96120] [Ruby master Bug#16403] Unavailable protected methods through `Symbol#to_proc`

Issue #16403 has been reported by AlexWayfer (Alexander Popov).

----------------------------------------
Bug #16403: Unavailable protected methods through `Symbol#to_proc`
https://bugs.ruby-lang.org/issues/16403

* Author: AlexWayfer (Alexander Popov)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Hello!

I've faced with a bug (I guess):

``` ruby
# protected.rb
# frozen_string_literal: true

class Foo
  def initialize(text, *children)
    @text = text
    @children = children
  end

  def via_each
    @children.reduce(text) do |result, child|
      result + child.text
    end
  end

  def via_map
    text + @children.map(&:text).reduce(:+)
  end

  protected

  attr_reader :text
end

child1 = Foo.new('Alexander ')
child2 = Foo.new('Popov')

foo = Foo.new('Hello ', child1, child2)

puts foo.via_each

puts foo.via_map
```

Output:

```
Hello Alexander Popov
Traceback (most recent call last):
	2: from protected.rb:31:in `<main>'
	1: from protected.rb:16:in `via_map'
protected.rb:16:in `map': protected method `text' called for #<Foo:0x000055db24b97710 @text="Alexander ", @children=[]> (NoMethodError)
```




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