From: "fxn (Xavier Noria)" <noreply@...>
Date: 2022-06-15T20:13:14+00:00
Subject: [ruby-core:108937] [Ruby master Bug#18832] Suspicious superclass mismatch

Issue #18832 has been reported by fxn (Xavier Noria).

----------------------------------------
Bug #18832: Suspicious superclass mismatch
https://bugs.ruby-lang.org/issues/18832

* Author: fxn (Xavier Noria)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
The following code:

```ruby
module M
  class C
  end
end

include M

p Object.const_defined?(:C, false)

class C < String # (1)
end
```

prints `false`, as expected, but then raises `superclass mismatch for class C (TypeError)` at (1).

I believe this is a bug, because `Object` itself does not have a `C` constant, so (1) should just work, and the superclasse of `M::C` should be irrelevant.



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