From: "artur86 (Artur *) via ruby-core" <ruby-core@...>
Date: 2025-02-24T17:18:50+00:00
Subject: [ruby-core:121151] [Ruby master Feature#21155] File scoped namespace declarations as in C#

Issue #21155 has been updated by artur86 (Artur *).


Hanmac (Hans Mackowiak) wrote in #note-2:
> @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.

I edited the description.

----------------------------------------
Feature #21155: File scoped namespace declarations as in C#
https://bugs.ruby-lang.org/issues/21155#change-112086

* Author: artur86 (Artur *)
* Status: Open
----------------------------------------
Given there is a file with a class that needs to be namespaced. There are basically two options currently.

`module` implies indenting the class by one level:

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

Scope resolution operator (`::`) needs no indentation, 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
```

Neither options enables to declare a namespace once at the top of a file and let Ruby treat all the subsequent constants to be under that namespace. Wouldn't it be better to implement something similar in Ruby? 

This is implemented in C# under the name of [File Scoped Namespaces](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/file-scoped-namespaces).

[The discussion on StackOverflow](https://stackoverflow.com/q/40809717/2987689).



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