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MiniZinc

/***
!Test
expected:
- !Result
solution: !Solution
b: true
***/
% Simplified regression test for bug #290: this model caused a self-assignment
% to be created for one of the introduced variables.
% Dummy variable, for output only.
var bool: b :: add_to_output = true;
array[1..2,1..2] of int: a = array2d(1..2, 1..2, [1, 2, 3, 4]);
array[1..2,1..2] of var 0..1: x;
array[1..2] of var int: z = [ sum([a[s,t] * x[s,t] | t in 1..2]) | s in 1..2 ];
constraint z[1] = sum([a[1,t] * x[1,t] | t in 1..2]);
solve satisfy;
output ["b = ", show(b), "\n"];