[Haskell-cafe] Things stopping pure Haskell code

[Doug McIlroy]

>  What other holes are there that allow my pure functions to
>  change their answer on different machines?

Floating point poses potential surprises. Library functions
required by Haskell, but obtained from outside, can differ.
IEEE FP  modes may not be consistently set across all
 or even consistently at all times in one system
if control ever leaaves Haskell code.
Haskell's second-rate IO conversion functions cry out for
replacement. I can imagine them being replaced in installations
that really care about floating-point.

Doug McIlroy