14 Apr
2010
14 Apr
'10
4:15 a.m.
On 14 Apr 2010, at 09:12, Jonas Almström Duregård wrote:
f,g :: Bool -> Int f x = 6 g x = 6
We can in Haskell compute that these two functions are equal, without solving the halting problem.
what about these? f,g :: Bool -> Int f x = 6 g x = x `seq` 6
As pointed out on #haskell by roconnor, we apparently don't care, this is a shame... We only care that x == y => f x == g y, and x == y can't tell if _|_ == _|_. It's a shame that we can't use this to tell if two functions are equally lazy (something I would consider part of the semantics of the function). Bob