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v/vlib/builtin/struct_test.v

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struct A{
mut:
val int
nums []int
}
struct B{
mut:
a A
}
struct C {
mut:
b B
nums []int
as []A
num int
}
fn test_struct_levels() {
mut c := C{}
assert c.nums.len == 0
c.nums << 3
assert c.nums.len == 1
assert c.nums[0] == 3
c.nums[0] = 4
assert c.nums[0] == 4
c.b.a.val = 34
assert c.b.a.val == 34
c.b.a.nums = [0;0]
c.b.a.nums << 0
c.b.a.nums << 2
assert c.b.a.nums.len == 2
assert c.b.a.nums[0] == 0
assert c.b.a.nums[1] == 2
c.b.a.nums [0] = 7
assert c.b.a.nums[0] == 7
c.as << A{val:8}
assert c.as.len == 1
assert c.as[0].val == 8
c.num = 20
assert c.num == 20
c.as[0].val = 10
assert c.as[0].val == 10
}