runstmt within API

[C.M.Brown]

Hi Pepe,

> The result of an expression is not a String, but an arbitrary value of
> some type.

Yes, sorry I forgot to mention that I will also be evaluating expressions
of type Bool in this context.

> One way to do that (untested):
> ...

Thanks for that. I had to modify it a bit to typecheck and compile, but it
seems to work remarkably well!

> stdout is to enable the flag -no-print-bind-result
>
> It would be nice to wrap this code in a more friendly API. Hopefully
> the SoC project will take care of that !

Yes, indeed something like runStmtToString :: Session -> String -> IO
(Maybe Sting)

or something.

Thanks,
Chris.