On Thu, Nov 8, 2012 at 6:32 PM, Emmanuel Touzery <etouzery@gmail.com> wrote:

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

However this is the output with GHC 7.0.4:
<GHC.List.CAF>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 <ozgurakgun@gmail.com> 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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