[Haskell-cafe] Three questions to graphviz

Ketil Malde ketil at malde.org
Mon Oct 10 22:17:35 CEST 2011

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".

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

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