--- /dev/null
+#include "nit.common.h"
+val* NEW_core__utf8__UTF8Coder(const struct type* type);
+extern const struct type type_core__utf8__UTF8Coder;
+val* NEW_core__utf8__UTF8Decoder(const struct type* type);
+extern const struct type type_core__utf8__UTF8Decoder;