MINOS 5.5: infeasible problem (or bad starting guess).
252 iterations
Nonlin evals: constrs = 390, Jac = 389.
Objective = find a feasible point.
x1 = -1
x2 = 0.780964
x3 = -1
x4 = 1
x5 = -1
x6 = -0.953854
x7 = 0.467542
x8 = -0.285714