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MiniZinc

% RUNS ON mzn20_fd
% RUNS ON mzn-fzn_fd
% RUNS ON mzn20_mip
% Test assertions that should succeed.
array [1..10] of int: a =
[i | i in 1..10];
% Predicate style assertion.
%
constraint assert(forall (i in 1..9) (a[i] < a[i + 1]), "a not increasing");
% Function style assertion.
%
test even(int: x) = (x mod 2 = 0);
array [1..10] of int: b =
[assert(even(2 * a[i]), "that's odd...", 2 * a[i]) | i in 1..10];
var 1..10: x;
constraint b[x] = max(b);
solve satisfy;
output ["x = ", show(x), "\n"];