+ var from_var = nitni_visitor.var_from_c("from", from)
+ from_var = nitni_visitor.box_extern(from_var, from)
+ var recv_var = nitni_visitor.type_test(from_var, to, "FFI isa")
+ nitni_visitor.add("return {recv_var};")
+
+ nitni_visitor.add("\}")
+ end