Error: undefined identifier infinity

[vrzh]

I have a large model, but managed to find the following minimal example which shows my issue:

var int: a;
var int: b;
constraint a mod b != 0;
solve satisfy;

I do not want to give bounds to variables a and b because in my full model, I don't know what those bounds should be.

Full error message is:

Error: Unknown character in line no. 6
Error: undefined identifier infinity in line no. 6
Error: syntax error, unexpected FZ_DOTDOT, expecting ')' or ',' in line no. 6
=====ERROR=====

Generated .fzn file contents (using MiniZincIDE-2.5.3-bundle-linux-x86_64):

var int: a:: output_var;
var int: b:: output_var;
var int: X_INTRODUCED_0_ ::var_is_introduced ;
constraint int_ne(b,0);
constraint int_mod(a,b,X_INTRODUCED_0_);
constraint set_in(X_INTRODUCED_0_,-infinity..-1 union {} union 1..infinity);
solve  satisfy;

[a1880]

Looks like a bug.

A workaround for modulo/divisibility:

constraint (b * (a div b)) == a;

or

constraint (a - b*(a div b)) == 0;