Pull codegen into it's own crate

serde_codegen/src/lib.rs

@@ -0,0 +1,24 @@
+#![feature(custom_derive, plugin, rustc_private, unboxed_closures)]
+#![plugin(quasi_macros)]
+
+extern crate aster;
+extern crate quasi;
+extern crate rustc;
+extern crate syntax;
+
+mod attr;
+mod de;
+mod field;
+mod ser;
+
+pub fn register(reg: &mut rustc::plugin::Registry) {
+    reg.register_syntax_extension(
+        syntax::parse::token::intern("derive_Serialize"),
+        syntax::ext::base::Decorator(
+            Box::new(ser::expand_derive_serialize)));
+
+    reg.register_syntax_extension(
+        syntax::parse::token::intern("derive_Deserialize"),
+        syntax::ext::base::Decorator(
+            Box::new(de::expand_derive_deserialize)));
+}