fix(codegen): Support extern crate serde not in toplevel module

serde_tests/tests/test.rs

@@ -1,6 +1,4 @@
 #![cfg_attr(feature = "nightly", feature(plugin))]
 #![cfg_attr(feature = "nightly", plugin(clippy))]
 
-extern crate serde;
-
 include!(concat!(env!("OUT_DIR"), "/test.rs"));

serde_tests/tests/test_annotations.rs

@@ -1,4 +1,5 @@
-use serde::{Serialize, Serializer, Deserialize, Deserializer};
+extern crate serde;
+use self::serde::{Serialize, Serializer, Deserialize, Deserializer};
 
 use token::{
     Error,

serde_tests/tests/test_bytes.rs

@@ -1,8 +1,9 @@
-use serde;
 use std::fmt;
 use std::error;
-use serde::Serialize;
-use serde::bytes::{ByteBuf, Bytes};
+
+extern crate serde;
+use self::serde::Serialize;
+use self::serde::bytes::{ByteBuf, Bytes};
 
 ///////////////////////////////////////////////////////////////////////////////
 

serde_tests/tests/test_de.rs

@@ -2,7 +2,8 @@ use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::net;
 use std::path::PathBuf;
 
-use serde::de::{Deserializer, Visitor};
+extern crate serde;
+use self::serde::de::{Deserializer, Visitor};
 
 use token::{
     Error,

serde_tests/tests/token.rs

@@ -2,9 +2,10 @@ use std::fmt;
 use std::iter;
 use std::error;
 
-use serde::ser::{self, Serialize};
-use serde::de;
-use serde::de::value::{self, ValueDeserializer};
+extern crate serde;
+use self::serde::ser::{self, Serialize};
+use self::serde::de;
+use self::serde::de::value::{self, ValueDeserializer};
 
 #[derive(Clone, PartialEq, Debug)]
 pub enum Token<'a> {