sum!() { /* proc-macro */ }Expand description
sum!(body for pat in domain[, pat in domain ...]), algebraic summation,
lowered to nested sum_over folds. To allow an empty domain (or an empty
filter), anchor the sum to its model: sum!(model, body for pat in domain).
Sums written inside constraint!, soc_constraint!, objective!, or an
anchored sum inherit its expression context automatically. Selected terms
must belong to that model. Standalone unanchored sums require a first term.