cgen: fix array initialization with options (#17562)

vlib/v/gen/c/array.v

@@ -50,9 +50,13 @@ fn (mut g Gen) array_init(node ast.ArrayInit, var_name string) {
 				g.write('string_clone(')
 				g.expr(expr)
 				g.write(')')
+			} else {
+				if node.elem_type.has_flag(.option) {
+					g.expr_with_opt(expr, node.expr_types[i], node.elem_type)
 				} else {
 					g.expr_with_cast(expr, node.expr_types[i], node.elem_type)
 				}
+			}
 			if i != len - 1 {
 				if i > 0 && i & 7 == 0 { // i > 0 && i % 8 == 0
 					g.writeln(',')

vlib/v/tests/option_array_test.v

@@ -0,0 +1,11 @@
+fn test_main() {
+	a := [?int(1), 0, 2]
+	mut t := a[0]
+	assert t? == 1
+	t = a[1]
+	assert t? == 0
+	t = a[2]
+	assert t? == 2
+
+	_ := [?int(none), none]
+}