types.write_from_c_conversion_prefix(&mut arg_conv, &args_ty, Some(generics));
write!(&mut arg_conv, "arg").unwrap();
types.write_from_c_conversion_suffix(&mut arg_conv, &args_ty, Some(generics));
types.write_from_c_conversion_prefix(&mut arg_conv, &args_ty, Some(generics));
write!(&mut arg_conv, "arg").unwrap();
types.write_from_c_conversion_suffix(&mut arg_conv, &args_ty, Some(generics));