Marc Weber <marco-oweber@gmx.de> writes:

> Hi Qi,
>
> have a look at brainfuck language. Its turing complete as Python, Haskell, etc
> are. Then you'll learn that the quesntion "Can I do everything possible"
> is not at all important. You have to ask instead:  Can I complete my
> task in reasonable time and with reasonable runtime performance etc.

And in a way that makes the code maintainable.

>   For most use cases Haskell is a good choice - the only real things
> I'm missing are
> - nice stack traces
> - completion support - because I find it relaxing not having to looking
>   all names. This could be fixed to some extend though..

If you mean whilst writing your code, this is an editor issue (I believe
scion aims to help writing cross-editor utilities for things like
this).  ghci also has tab-completion, and ghc-mod provides such
functionality in Emacs.