Issue #12109 has been reported by Matt U.

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Bug #12109: Exception during class load can cause partially-loaded class
https://bugs.ruby-lang.org/issues/12109

* Author: Matt U
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-darwin15]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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I noticed this bug using Rails, which lazy-loads classes (via ActiveSupport.)

Here's a minimal test case:
~~~
#!/usr/bin/env ruby

begin
  # simulate loading a class from file at runtime
  eval %q{
    class Foo
      def self.bar
        fail 'bar'
      end

      bar

      def self.baz
        puts 'baz'
      end
    end
  }
rescue => e
  puts "rescued: #{e}"
end
# => rescued: bar

Foo.baz
# => undefined method `baz' for Foo:Class (NoMethodError)
~~~

EXPECTED
Either:
* No exception - finish adding the method to the class, or
* 'undefine' the class, at least making it obvious that the class didn't load completely (or in the case of rails/activesupport, allow it to be reloaded on-demand later)



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