<<loop>> means that you have an infinite loop that the system was able to detect at runtime. basically what happens is you have some function which is about to get evaluated. this is essentially a node in a graph. the runtime system marks this node as "i'm being evaluated." however, during the evaluation of this node, it try to evaluate itself, but now sees that it is marked as "i'm being evaluated" and thus knows that this will be an infinite loop. so, yes, you have an infinite loop somehwere in your code. -- Hal Daume III "Computer science is no more about computers | hdaume@isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume On Fri, 20 Dec 2002, Ingo Wechsung wrote:

Dear Haskellers,

when I execute a program made with GHC (standard Haskell only, no optimization) I get

Fail: << loop>>

I have -W on, but it only tells me about a single overlapping pattern, which is ok.

The same program crashes Hugs alltogether.

Any hints for what I should look in my sources?

MfG Ingo

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