From: "matz (Yukihiro Matsumoto)" <noreply@...>
Date: 2022-05-19T08:13:22+00:00
Subject: [ruby-core:108621] [Ruby master Feature#18618] no clobber def

Issue #18618 has been updated by matz (Yukihiro Matsumoto).

Status changed from Open to Closed

See [#18742](https://bugs.ruby-lang.org/issues/18742#note-4)

Matz.

----------------------------------------
Feature #18618: no clobber def
https://bugs.ruby-lang.org/issues/18618#change-97657

* Author: ed_ (Ed Mangimelli)
* Status: Closed
* Priority: Normal
----------------------------------------
Sometimes I want to be certain I'm not clobbering/masking a method:

```
class Dog
  def bark
    'bark!'
  end
end

class Poodle < Dog
  raise if method_defined? :bark
  def bark
    'bow-wow'
  end
end
```

I propose creating a shorthand. Maybe something like:

```
class Dog
  def bark
    'bark!'
  end
end

class Poodle < Dog
  ncdef bark        # "no clobber" def
    'bow-wow'
  end
end

=> #<MethodAlreadyDefined: Method `bark' already defined.>
```

This would be useful in scenarios where subclassing a class (or including a mixin) ***you don't own*** is common practice --for instance, subclassing `ApplicationRecord` for your model in Rails.

I agree that `ncdef` is pretty ugly. Maybe `def!` 







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