Re: [Haskell-beginners] exceptions and stacks

Well I recompiled but now I don't anymore have the input data to reproduce the problem. However if I hit control-c during the runtime, i get a very nice, and very big, stack, so i think it would work. So, great! Just be sure to use ghc 7.4+. emmanuel On Thu, Nov 8, 2012 at 6:32 PM, Emmanuel Touzery wrote:

Well I tried and it displays the same with GHC 7.4.1.

However this is the output with GHC 7.0.4: stack: Prelude.head: empty list

So this is supported from 7.4 onwards (well maybe 7.2, I guess that version existed).

So there are all the chances that with GHC 7.4.1 I would get a proper stack for my problem. I'll try it soon but I must reinstall all the libraries with profiling on the computer on which I have 7.4.1...

emmanuel

On Thu, Nov 8, 2012 at 1:08 PM, Ozgur Akgun wrote:

...

fwiw, I am getting a stack trace with 7.6.1.

-- stack.hs main = print $ foo [1] foo xs = bar xs ++ bar xs bar (x:xs) = [x, head xs]

$ ghc -prof -auto-all -rtsopts stack.hs

$ ./stack +RTS -xc *** Exception (reporting due to +RTS -xc): (THUNK_2_0), stack trace: GHC.List.CAF --> evaluated by: Main.bar, called from Main.foo, called from Main.main, called from Main.CAF --> evaluated by: Main.main, called from Main.CAF stack: Prelude.head: empty list

-- Ozgur Akgun

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