[Haskell-cafe] Bad interaction of inlinePerformIO and mutable vectors

Brandon Allbery allbery.b at gmail.com
Sun Aug 3 13:41:07 UTC 2014

On Sun, Aug 3, 2014 at 2:58 AM, David Feuer <david.feuer at gmail.com> wrote:

> I'm
> not even sure why they're called that, but what they *really* are is a
> mechanism for functions to return multiple values

They are unboxed in a way similar to the way the others are: no constructor
in their internal representation. They *do* have an extra level of
indirection still, just not the constructor cell that normally goes with
it. (This is also why historically their use in GHC has been rather

brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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