[Haskell-cafe] what is a stack overflow?

Simon Marlow simonmar at microsoft.com
Wed Jan 26 08:04:29 EST 2005

On 25 January 2005 16:04, S. Alexander Jacobson wrote:

> Ok.  I guessed I was producing a big expression
> of the form
>    addToFM (addToFM (addToFM (addToFM (addToFM ...)
> I tried to solve it by doing
>    (addToFM $! fm) key val
> But still got an error.  I then tried the same
> with the wrapper code, but still got the error.
> Is there a way to profile stack usage using GHCi
> (without compiling) to find the problem?

+RTS -xt -RTS will include the stack in a heap profile.  See


It will show you the size of the stack over time, but not the contents
of the stack.


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