Am Dienstag, 22. Februar 2005 00:34 schrieb Daniel Fischer: <snip>
That's a very common problem for newbies, so don't panic. In older versions of hugs (November 2002, e.g.), you would have got an unresolved overloading also from entering [] to the prompt (this is no longer so). If such things happen, add an explicit typing, if that doesn't help, then you have a problem.
To deepen the confusion, hugs has no problems with
Prelude> 1.5 == 1.5 True
I'm not quite sure why this works, must be due to type defaulting, however,
Ah, I found out, carefully rereading the pertinent paragraph of the report (4.3.4) informed me that, for the defaulting rules to be applied, *all Classes in the context must be defined in the Prelude or the standard libraries*, which of course ApproxEq isn't. If you include default () or default (Integer) in your script, 1.5 == 2.4 will also lead to an unresolved overloading, so defaulting really works. Bye for now, Daniel