[Haskell-cafe] Three questions to graphviz

[Ketil Malde]

kaffeepause73 <kaffeepause73 at yahoo.de> writes:

> Thanks for the quick reply - it works now. - I wasted quite a bit time on
> this.

Alternatively, you can turn on overloaded strings, which allows constructing
text values (along with other types that are instances of IsString) from
string constants.  Add 

{-# Language OverloadedStrings #-}

at the top of your source file to enable it.

> I guess the "internal" bit in the compiler message confused me.

It is a common idiom to put "internals" -- e.g. data type definitions --
in a module called "Internal".

-k
-- 
If I haven't seen further, it is by standing in the footprints of giants