[ruby-core:79383] [Ruby trunk Bug#13180] 'superclass mismatch for class' on nested classes

Issue #13180 has been reported by Adam Shannon.

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Bug #13180: 'superclass mismatch for class' on nested classes 
https://bugs.ruby-lang.org/issues/13180

* Author: Adam Shannon
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin15]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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I've been seeing the following errors when attempting to run different ruby projects. 

~~~
/usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:57:in `<class:Digest>': superclass mismatch for class Digest (TypeError)
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:16:in `<module:OpenSSL>'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:15:in `<top (required)>'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl.rb:19:in `require'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl.rb:19:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:8:in `require'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:8:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis/connection.rb:9:in `require'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis/connection.rb:9:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis.rb:2775:in `require'
	from /usr/local/lib/ruby/gems/2.4.0/gems/redis-3.3.3/lib/redis.rb:2775:in `<top (required)>'
	from /Users/adam/src/banno/banno-utility-belt/lib/sneakily_grant_auth.rb:2:in `require'
	from /Users/adam/src/banno/banno-utility-belt/lib/sneakily_grant_auth.rb:2:in `<top (required)>'
	from /Users/adam/src/banno/banno-utility-belt/libexec/bub-api.rb:2:in `require'
	from /Users/adam/src/banno/banno-utility-belt/libexec/bub-api.rb:2:in `<top (required)>'
	from /Users/adam/bin/bub:19:in `load'
	from /Users/adam/bin/bub:19:in `block in <main>'
	from /Users/adam/bin/bub:19:in `each'
	from /Users/adam/bin/bub:19:in `<main>'
~~~

I get a similar error with the Cipher class also.

~~~
/usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/cipher.rb:64:in `<class:Cipher>': superclass mismatch for class Cipher (TypeError)
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/cipher.rb:16:in `<module:OpenSSL>'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl/cipher.rb:15:in `<top (required)>'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl.rb:17:in `require'
	from /usr/local/Cellar/ruby/2.4.0/lib/ruby/2.4.0/openssl.rb:17:in `<top (required)>'
~~~

I was able to get my programs to run by commenting out line 57 in digest.rb and line 64 in cipher.rb. For reference, the lines were: 

~~~
cipher.rb:  class Cipher < Cipher; end
digest.rb:  class Digest < Digest; end # :nodoc:
~~~

I tried for a few minutes to reproduce this with the following, but was unable to see the error. (Running the file through ruby produced no error.)

~~~
class Foo
  class Foo < Foo; end
end
~~~



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