Nested pattern guards.

[Alex Ferguson]

Hi all.  Was there ever any sort of consensus about whether pattern
guards ought to be "nestable", or not?

And if not, was there some semantic objection to this, was the syntax
just considered to Unspeakable to be spoken of, or is the feature
just largely redundant?  (I think you can always rewrite them to flat
p-g's, without mammoth pain.)

Slainte,
Alex.