[ruby-core:102886] [Ruby master Bug#17725] Prepend Breaks Ability to Alias

Issue #17725 has been updated by joshuadreed (Josh Reed).


So, I set out to test my hypothesis regarding refinements. I've never used refinements prior to this, so it's still possible there's an interaction somewhere, but at least not in the way I was thinking.

``` ruby
module Dummy; end

class Foo
  def ten
    10
  end
end

module Bar
  refine Foo do
    def ten
      11
    end
  end
end

class Baz
  using Bar
  def check
    Foo.new.ten
  end
end

Baz.prepend(Dummy)

class Baz
  alias_method(:old_check, :check)
  def check
    puts 'blah blah'
    old_check
  end
end

p Baz.new.check

>blah blah
>11
```



----------------------------------------
Bug #17725: Prepend Breaks Ability to Alias
https://bugs.ruby-lang.org/issues/17725#change-90946

* Author: joshuadreed (Josh Reed)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Prepending any module to `String` and `Hash` (and possibly other or all classes?) blocks the ability to `alias` 

As an example:
``` ruby
module Dummy; end
# String.prepend(Dummy)
class String
  alias_method(:old_plus, :+)
  def + other
    puts 'blah blah'
    old_plus(other)
  end
end

'a' + 'b'

> blah blah
```

``` ruby
module Dummy; end
String.prepend(Dummy)
class String
  alias_method(:old_plus, :+)
  def + other
    puts 'blah blah'
    old_plus(other)
  end
end

'a' + 'b'

>
```

Prepending after an `alias` does not affect the previous `alias`



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