[m-dev.] Diff: Better handling of failure unifications

[Fergus Henderson]

Andrew Bromage, you wrote:
> 
> Fergus, you've seen most of it already, but could you please review
> it anyway?

That looks fine, although you should document a bit more clearly why
`Det = failure' for a unification implies that the unification will
definitely fail, rather than looping or aborting.

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