What causes <<loop>>?

Creighton Hogg wchogg at gmail.com
Sat Nov 8 11:32:38 EST 2008

So I'm trying to debug an issue that is causing GHC to emit the
<<loop>> warning.  I was hoping to get more information about what
exactly that tells me about the kind of problem, other than the
obvious interpretation that I appear to be getting into some kind of
infinite loop.  What is GHC detecting when it emits that warning?


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