2.8.0 Error while compiling regular constraint

[IgnaceBleukx]

Hi,

I am using MiniZinc v2.8.0 on Linux to solve the following problem:

include "globals.mzn";

int: N=5;
array[1..5] of var 1..10 : x;
enum STATE = {S1, S2, S3};
% DFA to define 12*1
array [STATE,1..2] of opt STATE: trans = [|     1:  2:
                                          | S1: S2, <>
                                          | S2: S3, S2
                                          | S3: <>, <>|];

constraint regular(x, trans, S1, {S3}); 

Which gives the the following error when compiling for any solver I have installed:

MiniZinc has encountered an internal error. This is a bug.
Please file a bug report using the MiniZinc bug tracker.
The internal error message was: 
"unexpected absent literal"

This model does work on v2.7.6

Kind regards,
Ignace