Remove serialize::traits submodule.

Author: erickt

src/librustc/metadata/decoder.rs

@@ -25,7 +25,11 @@ use reader = std::ebml::reader;
 use std::ebml;
 use std::map::HashMap;
 use std::map;
+#[cfg(stage0)]
 use std::serialize::traits::Decodable;
+#[cfg(stage1)]
+#[cfg(stage2)]
+use std::serialize::Decodable;
 use syntax::ast_map;
 use syntax::attr;
 use syntax::diagnostic::span_handler;

src/librustc/middle/astencode.rs

@@ -29,7 +29,11 @@ use std::ebml;
 use std::map::HashMap;
 use std::serialize;
 use std::serialize::{Encodable, EncoderHelpers, DecoderHelpers};
+#[cfg(stage0)]
 use std::serialize::traits::Decodable;
+#[cfg(stage1)]
+#[cfg(stage2)]
+use std::serialize::Decodable;
 use syntax::ast;
 use syntax::ast_map;
 use syntax::ast_util;

src/libstd/ebml.rs

@@ -657,7 +657,7 @@ mod tests {
             };
             let ebml_doc = reader::Doc(@bytes);
             let deser = reader::Decoder(ebml_doc);
-            let v1 = serialize::traits::Decodable::decode(&deser);
+            let v1 = serialize::Decodable::decode(&deser);
             debug!("v1 == %?", v1);
             assert v == v1;
         }