From: "bughit (bug hit) via ruby-core" <ruby-core@...>
Date: 2023-05-20T19:39:11+00:00
Subject: [ruby-core:113569] [Ruby master Feature#19644] Module::current to complement Module::nesting

Issue #19644 has been updated by bughit (bug hit).

Description updated

Eregon (Benoit Daloze) wrote in #note-5:
> > Could be useful for debugging/logging.
> 
> Those are not performance critical, so `Module::nesting[0]` is enough.

They could be if invoked frequently enough.

> 
> You also don't want to provide a concrete example where it's a clear gain, OK, let's close then until there is a clear use case for it where `Module::nesting[0]` is not enough.

Module::nesting[0] has to walk and build the entire inheritance chain. This is undesirable if you just want the current module.

If you don't know the difference between `self` and `Module::nesting[0]`, you're not qualified to reject this. Reopen it.

```ruby
class Class1
  def foo
    puts "#{Module.nesting[0]}##{__method__}" # Class1#foo
    puts "#{self.class}##{__method__}"        # Class2#foo
  end
end

class Class2 < Class1
  def foo
    super
  end
end

Class2.new.foo

```

----------------------------------------
Feature #19644: Module::current to complement Module::nesting
https://bugs.ruby-lang.org/issues/19644#change-103202

* Author: bughit (bug hit)
* Status: Rejected
* Priority: Normal
----------------------------------------
Module::current == Module::nesting[0] but without needlessly walking the entire nesting hierarchy.

Could be useful for debugging/logging.

It could also be a Kernel global (like `__method__`) or a keyword (like `__FILE__`)



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