Maybe types; value, ok := maybe_value(x)

core/_preload.odin

@@ -36,6 +36,9 @@ Type_Info :: union {
 	Pointer: struct #ordered {
 		elem: ^Type_Info
 	}
+	Maybe: struct #ordered {
+		elem: ^Type_Info
+	}
 	Procedure: struct #ordered {
 		params:   ^Type_Info // Type_Info.Tuple
 		results:  ^Type_Info // Type_Info.Tuple

core/fmt.odin

@@ -413,6 +413,13 @@ print_any_to_buffer :: proc(buf: ^[]byte, arg: any) {
 			print_pointer_to_buffer(buf, nil)
 		}
 
+	case Maybe:
+		if arg.data != nil {
+
+		} else {
+			print_string_to_buffer(buf, "<nil>")
+		}
+
 	case Enum:
 		value: i64 = 0
 		match type i : info.base {