What are the preconditions of newArray#

Edward Kmett ekmett at gmail.com
Mon Aug 22 17:54:34 CEST 2011

It would still be nice to have a consistent base case.

On Mon, Aug 22, 2011 at 3:43 AM, Johan Tibell <johan.tibell at gmail.com>wrote:

> On Mon, Aug 22, 2011 at 5:55 AM, Edward Z. Yang <ezyang at mit.edu> wrote:
> > stg_newArrayzh in rts/PrimOps.cmm doesn't appear to give any indication,
> > so this might be a good patch to add.  But I'm curious: what would
> > allocating Array#s of size 0 do? Null pointers? That sounds dangerous...
> I would imagine that a zero sized array would be a StgArrPtrs header
> with its size field set to 0. It's not a very useful thing to have, I
> admit. If someone (Simon?) can confirm that we don't intend to support
> zero-length array I'll push a patch that adds a comment.
> Johan
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