Compiled test.osl -> test.oso
u: 0, derivs 1 0
v: 0, derivs 0 1
a[0]: 0, derivs 1 0
a[1]: 0, derivs 0 1
u: 1, derivs 1 0
v: 0, derivs 0 1
a[0]: 1, derivs 1 0
a[1]: 0, derivs 0 1
u: 0, derivs 1 0
v: 1, derivs 0 1
a[0]: 0, derivs 1 0
a[1]: 1, derivs 0 1
u: 1, derivs 1 0
v: 1, derivs 0 1
a[0]: 1, derivs 1 0
a[1]: 1, derivs 0 1

