[ruby-core:121521] [Ruby Feature#21209] Endless classes and modules

2 Apr 2025

      Issue #21209 has been updated by mame (Yusuke Endoh).

A similar issue was raised in #21155. We discussed that issue at the last dev meeting, and several endless class definition syntax was proposed.

```ruby
module = Foo

in module Foo

for module Foo
```

However, @matz didn't like any of them. Also, he said that this issue was inevitable in object-oriented programming, and that he would close #21155 (which doesn't seem to be closed yet).

So perhaps this proposal is also hopeless. (Personally, I would like to solve this problem, though.)

----------------------------------------
Feature #21209: Endless classes and modules
https://bugs.ruby-lang.org/issues/21209#change-112547

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
----------------------------------------
Endless methods have proven popular enough that we should bring the same endlessness to module/class definitions.

For a long time we've had this ugly pattern of class definitions with an extreme level of indentation.

I propose a simple new rule to fix this: if a 'class' or 'module' statement is at the beginning of a line, the matching 'end' becomes optional; EOF is enough.

instead of:
```ruby
module Arel
  module Visitors
    class UnsupportedVisitError
      module ClassMethod
        module AmIDeepEnough
          module NoNotDeepEnough
            class LetsGoDeepter

              def firstmethod
                "man, I'm just the first method and already indented 14 spaces deep!"
              end

            end #what
          end #a 
        end #chain
      end #we
    end #have
  end #here
end #weee!!!
```

we can have the much more readable:
```ruby
module Arel
module Visitors
class UnsupportedVisitError
module ClassMethod
module AmIDeepEnough
module NoNotDeepEnough
class LetsGoDeepter

def firstmethod
  "now that's better!"
end
```

Brilliant!

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