For a few more such leaks, see http://hackage.haskell.org/package/base-4.6.0.1/docs/System-Info.html , as mentioned in http://conal.net/blog/posts/notions-of-purity-in-haskell . -- Conal On Mon, Nov 11, 2013 at 7:01 AM, Ryan Newton 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.

Thanks, -Ryan

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