Compiled test.osl -> test.oso
test struct within struct

test struct-with-struct field assignment:
  ok
test passing the outer struct to a function:
 b == { 2.71828, { 3.14159, [1 2 3 4 5], [0 1 2] } }
test passing the inner struct to a function:
 b.a == { 3.14159, [1 2 3 4 5], [0 1 2] }
test sub-structure assignment:
 after b.a=aparam, b.a= == { 1, [10 11 12 13 14], [3 4 5] }

