Though actually, now that I think about it, the cascaded notation
in S12 is illegal according to S03, since "does" is classified as
non-chaining, which implies non-associative.  Hmm.  We'd have to make
it right associative somehow.  Put it in with ** maybe?


Or leave it non-associative and force | or ; notation to keep things
crystal clear.  The basic problem is that the declarational "does" has
a natural scope that it applies to, so it doesn't have to arbitrarily
limit its scope as a binary operator does.


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