[ruby-core:19750] [Bug #730] Infinite recursion on 'super' in dynamically generated modules

Bug #730: Infinite recursion on 'super' in dynamically generated modules
http://redmine.ruby-lang.org/issues/show/730

Author: Sander Land
Status: Open, Priority: Normal
Category: core, Target version: 1.9.1

Note:
Bug reported earlier (2007-12-21) on rubyforge, but still exists in 1.9.1
More detailed description at:
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=16493&group_id=426
and
http://pastie.org/132996

Take the following test case:

def genmod
  Module.new{
    def foo
      super 
    end
  }
end

mod = genmod
mod2= genmod # comment this line to stop infinite recursion and get a (correct) 'no superclass method' error.
klass = Class.new{ include mod }
klass.new.foo # infinite recursion

This causes:

smallbug19.rb:4:in `foo': stack level too deep (SystemStackError)
        from smallbug19.rb:4:in `foo'
        from smallbug19.rb:4:in `foo'
        from smallbug19.rb:4:in `foo'
        from smallbug19.rb:4:in `foo'
etc.

So somehow the module is considered its own superclass, after multiple calls to a function that generates modules.
Everything is alright after the first call, but after the second call the module generated in the first call somehow breaks.

See the links above, especially the pastie link, and attached files for some test cases and old attempts to track it down in the 1.9.0 C code.

Ruby 1.8.x does not have this bug, and (as far as I know) all 1.9.x versions do.


----------------------------------------
http://redmine.ruby-lang.org