Add a single driver for tests and benchmarks

serde_tests/benches/bench_struct.rs

@@ -1,15 +1,9 @@
-#![feature(custom_derive, plugin, test)]
-#![plugin(serde_macros)]
-
-extern crate serde;
-extern crate rustc_serialize;
-extern crate test;
-
 use std::collections::HashMap;
 use test::Bencher;
 
 use rustc_serialize::{Decoder, Decodable};
 
+use serde;
 use serde::de::{Deserializer, Deserialize};
 
 //////////////////////////////////////////////////////////////////////////////
@@ -34,8 +28,6 @@ pub struct Outer {
 pub enum Error {
     EndOfStream,
     SyntaxError,
-    UnexpectedName,
-    ConversionError,
     MissingField,
     OtherError,
 }