[Haskell-cafe] Generating random enums
nowgate at yahoo.com
Sat May 2 14:54:21 EDT 2009
I intuited that that's what the problem was.
--- On Sat, 5/2/09, Rahul Kapoor <rk at trie.org> wrote:
From: Rahul Kapoor <rk at trie.org>
Subject: Re: [Haskell-cafe] Generating random enums
To: "michael rice" <nowgate at yahoo.com>
Cc: "John Van Enk" <vanenkj at gmail.com>, haskell-cafe at 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'
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