Re: [Haskell-cafe] Newbie: Is it possible to catch _|_ ?

Oh. I was figuring that the runtime would detect _|_ whenever evaluation requires that it calculate a given expressoin, and that expression is currently being evaluated...that is, some subset of an expression evaluates to the expression itself. Now that you mention it, I guess there are a lot of other nonterminating conditions....hmmm. Thanks for the prompt response! Russ Lewis Experienced imperative programmer, functional newbie :) Ketil Malde wrote:

"Russ Lewis" writes:

...

Another newbie question: Is it possible to catch _|_ - that is, to encounter it, handle it and continue?

Since _|_ is the value of a non-terminating computation, this requires you to solve the halting problem. GHC does occasionally detect loops, but for the general case, don't hold your breath :-)

-kzm