[m-rev.] diff: Define equality for version_hash_tables.

[Peter Wang]

On Mon, 27 May 2013 18:26:31 +1000, Paul Bone <paul at bone.id.au> wrote:
> +:- semipure pred pointer_equals(T::in, T::in) is semidet.
> +:- pragma inline(pointer_equals/2).

pointer_equals is pure.

Peter