From: "Hanmac (Hans Mackowiak) via ruby-core" <ruby-core@...>
Date: 2025-02-24T14:59:28+00:00
Subject: [ruby-core:121150] [Ruby master Feature#21155] File scoped namespace declarations as in C#

Issue #21155 has been updated by Hanmac (Hans Mackowiak).


@artur86 the difference between these two are the module nesting

See this doku about this: https://ruby-doc.org/3.2/syntax/modules_and_classes_rdoc.html#label-Constants

In Short, the second variant can raise NameError if you don't use `MyNamespace` everywhere.

----------------------------------------
Feature #21155: File scoped namespace declarations as in C#
https://bugs.ruby-lang.org/issues/21155#change-112082

* Author: artur86 (Artur *)
* Status: Open
----------------------------------------
Given there is a class that needs to be namespaced. 

`module` requires indenting the class by one level:

```ruby
module MyNamespace
  class MyClass; end
end
```

Scope resolution operator (`::`) does not require it, but it works differently than using `module` and repeating module name for every class inside seems tedious and verbose to me:
```ruby

class MyNamespace::MyClass; end
class MyNamespace::MyAnotherClass; end
class MyNamespace::OneMoreClass; end
end
```

What if something similar to [File Scoped Namespaces in C#](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/file-scoped-namespaces) would be implemented in Ruby?

The concept is very clearly formulated in [a question on StackOverflow](https://stackoverflow.com/q/40809717/2987689) and sounds like "everything in this file should be in some module".



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