[ruby-core:73878] [Ruby trunk Feature#12084] `Class#instance`

Issue #12084 has been reported by Tsuyoshi Sawada.

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Feature #12084: `Class#instance`
https://bugs.ruby-lang.org/issues/12084

* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee: 
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For meta-programming/debugging purposes, I would like to request the inverse of `Object#singleton_class`. Namely, a method that is called on a class that is a singleton class, and returns the object it is a singleton of. Since the `Singleton` module in the standard library http://ruby-doc.org/stdlib-2.3.0/libdoc/singleton/rdoc/Singleton.html assigns the method name `instance` to such classes, I think `Class#instance` should be the name for such feature.

~~~RUBY
Array.singleton_class.instance # => Array
"foo".singleton_class.instance # => "foo"
~~~

When the receiver is a class but is not a singleton class, then it should raise an error.

~~~RUBY
Array.instance # => error
~~~



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