Re: Fix 380: Try to auto-detect cyclic references in header fields (issue 4951073)

[hanwenn]

have you thought of fixing this generically instead?

You could the hare/tortoise algorithm to detect cycles in any markup,
and could run that on the entry point (not the recursive function) for
evaluating markups to stencils.

http://codereview.appspot.com/4951073/