Things stopping pure Haskell code from having a cross-platform single semantics?
conal at conal.net
Tue Nov 12 00:35:48 UTC 2013
For a few more such leaks, see
http://hackage.haskell.org/package/base-220.127.116.11/docs/System-Info.html , as
mentioned in http://conal.net/blog/posts/notions-of-purity-in-haskell . --
On Mon, Nov 11, 2013 at 7:01 AM, Ryan Newton <rrnewton at gmail.com> wrote:
> Haskell isn't like Java byte code in having a single semantics for a
> program irrespective of where it is run. In particular, "Int" has a
> platform-defined width -- so the same (pure) code can yield different
> answers on different machines.
> numCapabilities was also a "leak" of platform information, which did not
> require IO. But, happily, now it does not appear in the [Trustworthy]
> module, Control.Concurrent.
> Ok, what else? What other holes are there that allow my pure functions to
> change their answer on different machines? I'm making a list of these in a
> paper and I want to make sure I give a full account.
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