23 Aug
                
                    2013
                
            
            
                23 Aug
                
                '13
                
            
            
            
        
    
                6:34 a.m.
            
        (I forgot to send to the list, trying again)
Thank you very much for your detailed explanation!
On Fri, Aug 23, 2013 at 1:24 PM, Richard Eisenberg 
This is a good question. Happily, there are at least two decent answers.
1) We're not sure that this problem cannot cause a segfault… it's just that we've been unable to produce one when trying. Perhaps we haven't tried hard enough.
I successfully constructed such an example. https://github.com/takano-akio/type-family-overlap - Akio