Yes -- wow. I had tried similar techniques, but couldn't get it to go through in the end. I think using the datatype was the key. Cool!

I will update the wiki as per Simon's suggestions.

On Aug 23, 2013, at 6:34 AM, Akio Takano wrote:

(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 <eir@cis.upenn.edu> wrote:
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