[ruby-core:112810] [Ruby master Feature#19520] Support for `Module.new(name)` and `Class.new(superclass, name)`.

9 Mar 2023

      Issue #19520 has been updated by ioquatix (Samuel Williams).

Just thinking out loud, maybe we need to stop assuming strings (that can be fooled) represent class paths/namespaces.

```ruby
m = Module.new
module M
end

m.class_eval("class N; end")
M.class_eval("class N; end")

m.anonymous? # true
M.anonymous? # false

m.namespace # [m]
M.namespace # [M]

m::N.anonymous? # true
M::N.anonymous? # false

m::N.namespace # [m, N]
M::N.namespace # [M, N]
```

----------------------------------------
Feature #19520: Support for `Module.new(name)` and `Class.new(superclass, name)`.
https://bugs.ruby-lang.org/issues/19520#change-102313

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
----------------------------------------
See <https://bugs.ruby-lang.org/issues/19450> for previous discussion and motivation.

[This proposal](https://github.com/ruby/ruby/pull/7376) introduces the `name` parameter to `Class.new` and `Module.new`:

```ruby
Class.new(superclass, name)
Module.new(name)
```

As a slight change, we could use keyword arguments instead.

## Example usage

The current Ruby test suite has code which shows the usefulness of this new method:

```ruby
  def labeled_module(name, &block)
    Module.new do
      singleton_class.class_eval {
        define_method(:to_s) {name}
        alias inspect to_s
        alias name to_s
      }
      class_eval(&block) if block
    end
  end
  module_function :labeled_module

  def labeled_class(name, superclass = Object, &block)
    Class.new(superclass) do
      singleton_class.class_eval {
        define_method(:to_s) {name}
        alias inspect to_s
        alias name to_s
      }
      class_eval(&block) if block
    end
  end
  module_function :labeled_class
```

The updated code would look like this:

```ruby
  def labeled_module(name, &block)
    Module.new(name, &block)
  end

  def labeled_class(name, superclass = Object, &block)
    Class.new(superclass, name, &block)
  end
  module_function :labeled_class
```

-- 
https://bugs.ruby-lang.org/