v/vlib/v/tests/generic_sumtype_cast_test.v

module main

struct Empty {}

struct Node[T] {
	value T
mut:
	next Tree[T]
}

type Tree[T] = Empty | Node[T]

fn create[T]() Tree[T] {
	empty := Empty{}
	mut curr := Node[T]{10, empty}
	for _ in 0 .. 10 {
		curr.next = Node[T]{20, empty}
	}

	return curr
}

fn create_node[T](args []T) Tree[T] {
	empty := Empty{}
	if args.len == 0 {
		return empty
	}

	mut curr := Node[T]{args[0], empty}

	for i := 1; i < args.len; i += 1 {
		curr.next = Node[T]{args[i], empty}
		curr = curr.next as Node[T]
	}

	return curr
}

fn merge_nodes[T](head Tree[T]) Tree[T] {
	println('${head}')

	return Empty{}
}

fn test_generic_sumtype_cast() {
	node := create_node[int]([0, 3, 1, 0, 4, 5, 2, 0])
	merge_nodes(node)
	create[int]()
	assert true
}