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Vector containing boolean
classification matches
In cases where a classification needs to be based on a result that
has been reduced to a scalar, \ref{_cmatch_to-scalar_} does not
solve the whole problem: for this, \ref{_classify-scalar_} may be
used. In addition to performing the action of the former (if {\tt
@yields} is provided), the resulting classification itself will
match on the scalar result. While this is not strictly
necessary---the predicate itself is already scalar---this is
important for systems or templates that derive the classification
result from the name of the classification.
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@const@ is deprecated; use @value@ with a #-prefix instead.
\ref{_vector-to-class_} converts a vector into a classification.
Classification of