Re: [Haskell-cafe] Generating random enums

2 May 2009

      I intuited that that's what the problem was.

Thanks,

Michael

--- On Sat, 5/2/09, Rahul Kapoor <rk@trie.org> wrote:

From: Rahul Kapoor <rk@trie.org>
Subject: Re: [Haskell-cafe] Generating random enums
To: "michael rice" <nowgate@yahoo.com>
Cc: "John Van Enk" <vanenkj@gmail.com>, haskell-cafe@haskell.org
Date: Saturday, May 2, 2009, 2:00 PM
...
OK, I think what you're saying is to work with (random) integers and use
fromEnum and toEnum to get corresponding DayOfWeek. But I get this when I
try to use toEnum:
*Main> toEnum 2
ghci does not know what type of enum you want to create from the number 2.
Try: toEnum 2 :: DayOfWeek

That said, I would expect "toEnum 2" to give an error like: 'Ambiguous
type variable `a'....'. So I am not sure why your error message says:
'** Exception: Prelude.Enum.().toEnum: bad argument'