Add ctype new support

crates/luaffi/src/option.rs

@@ -39,7 +39,7 @@ unsafe impl<T: FromFfi> FromFfi for Option<T> {
     fn prelude(arg: &str) -> impl Display {
         let ct = Self::From::name();
         display!(
-            "if {arg} == nil then {arg} = __cnew(__ctypes.{ct}); else {}{arg} = __cnew(__ctypes.{ct}, 1, {arg}); end; ",
+            "if {arg} == nil then {arg} = __new(__ct.{ct}); else {}{arg} = __new(__ct.{ct}, 1, {arg}); end; ",
             T::prelude(arg)
         )
     }