[Haskell] Read Instances for Data.Map and Data.Set

[Malcolm Wallace]

Georg Martius <mai99dgf at studserv.uni-leipzig.de> writes:

> Thanks for checking in the stuff. However, I am really sorry, but my code 
> contains a bug!
> Example: "{Foo:=-0.9,...}"
> Problem: "lex" parses ":=-" as one lexeme

One can reasonably argue that this is actually a bug in show,
not read.  It can be fixed by adding parens, or spaces, to the show.
(I'm inclined towards spaces myself.)

Regards,
    Malcolm