parser: fix initialization for array of Option type - []?Cell{} (#16652)

vlib/v/parser/containers.v

@@ -28,7 +28,7 @@ fn (mut p Parser) array_init() ast.ArrayInit {
 		line_nr := p.tok.line_nr
 		p.next()
 		// []string
-		if p.tok.kind in [.name, .amp, .lsbr, .key_shared] && p.tok.line_nr == line_nr {
+		if p.tok.kind in [.name, .amp, .lsbr, .question, .key_shared] && p.tok.line_nr == line_nr {
 			elem_type_pos = p.tok.pos()
 			elem_type = p.parse_type()
 			// this is set here because it's a known type, others could be the

vlib/v/tests/option_init_test.v

@@ -0,0 +1,6 @@
+struct Cell {}
+
+fn test_main() {
+	mut var := []?Cell{len: 1}
+	assert var.len == 1
+}