[Haskell-cafe] Instance match surprise

Wojtek Narczyński wojtek at power.com.pl
Mon Feb 1 22:56:58 UTC 2016

On 01.02.2016 21:29, Tom Ellis wrote:
> If you want to know*why*  the instance contexts are ignored then you'll have
> to ask someone who knows more about Prolog:)
I think I know. There is really no way of knowing that there is no 
vicious little instance Eq ANY lurking deep down some obscure useless 
module. It is called: open world assumption.

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