[Haskell-cafe] Re: what is inverse of mzero and return?
Jorge Adriano Aires
jadrian at mat.uc.pt
Mon Jan 24 21:05:34 EST 2005
(Sorry about the recurrent self answers)
> Maybe (not sure) it is sensible to
> sapecify return::(a -> IO a), as an action with no side effects such that
> return x === return x iff x === x.
return x === return y iff x === y <-- this is what I meant to write.
But even that is not enough, should be:
"return x is an action with no side effects and that always returns x"
The previous specification is be a consequence of this one, and it failed to
specify that the returned value was always x.
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