[ruby-core:112575] [Ruby master Feature#19450] Is there an official way to set a class name without setting a constant?

24 Feb 2023

      Issue #19450 has been updated by jeremyevans0 (Jeremy Evans).

matheusrich (Matheus Richard) wrote in #note-9:
...
Semi-related (maybe it should be a separate issue?) but assigning a class to a constant via rightward assignment results in `NameError`
``` ruby
Class.new => Klass
# uninitialized constant Klass (NameError)
```
Not a bug.  "Rightward assignment" is not assignment, but pattern matching:

```ruby
1 => Bar     # raises NameError, because Bar is not defined
1 => Integer # nil
1 => String  # NoMatchingPatternError, because String === 1 is not true 
```

----------------------------------------
Feature #19450: Is there an official way to set a class name without setting a constant?
https://bugs.ruby-lang.org/issues/19450#change-102024

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
----------------------------------------
This is the best I could come up with:

```ruby
klass = Class.new

Object.const_set("Klass", klass)
Object.send(:remove_const, "Klass")

puts klass.new
# => #<Klass:0x0000000100a9d688>
```

Can we do better?

What about something like:

```ruby
Class.new(name: "Klass")
```

or

```ruby
Class.new do
  def self.name
    "Klass"
  end
end
```

etc

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