[Haskell-cafe] pointer equality

[wren ng thornton]

On 7/20/11 5:08 PM, Paul Johnson wrote:
> I would have thought that the compiler, as a matter of optimisation,
> could insert a check to see if (==) is comparing an object with itself.
> The only way I can see this breaking is with perverse instances of Eq
> that would return False for "f == f".

Like the instance for Double (where f = NaN)?

-- 
Live well,
~wren