Compiled test.osl -> test.oso
test struct param initialization: v2iparam = 19 20
test struct return
{2 3} + {10 20} = {12 23}
square({2 3}) = {4 9}
Complicated example: [ f=3.141593, v={10 20}, a=[1, 2, 3], v=[{20 40}, {40 80}] ]

