[Haskell-cafe] Re: What is the meaning of tilde ("~") symbol

On Sat, 2010-02-13 at 14:03 +0100, kg wrote:

Hi,

I'm reading the following subject : http://www.haskell.org/pipermail/haskell-cafe/2007-July/028227.html

In the sample code, we can see :

instance ReadAsAnyOf () ex where readAsAnyOf ~() = mzero

And, I've search the meaning of the symbol "~", but I've found nothing about this (note that's not easy to search "~" on google ...)

Could you give me a link about this, or explain me it ?

Thx in advance.

http://www.haskell.org/tutorial/patterns.html - Section lazy patterns Regards