Merge pull request #19755 from alexcrichton/rust-serialize

rustc: Start the deprecation of libserialize

Reviewed-by: aturon

Author: bors

src/libsyntax/ext/deriving/mod.rs

@@ -70,8 +70,28 @@ pub fn expand_meta_deriving(cx: &mut ExtCtxt,
 
                             "Hash" => expand!(hash::expand_deriving_hash),
 
-                            "Encodable" => expand!(encodable::expand_deriving_encodable),
-                            "Decodable" => expand!(decodable::expand_deriving_decodable),
+                            "RustcEncodable" => {
+                                expand!(encodable::expand_deriving_encodable)
+                            }
+                            "RustcDecodable" => {
+                                expand!(decodable::expand_deriving_decodable)
+                            }
+                            "Encodable" => {
+                                // NOTE: uncomment after a stage0 snap
+                                // cx.span_warn(titem.span,
+                                //              "deriving(Encodable) is deprecated \
+                                //               in favor of deriving(RustcEncodable)");
+
+                                expand!(encodable::expand_deriving_encodable)
+                            }
+                            "Decodable" =>
+                                // NOTE: uncomment after a stage0 snap
+                                // cx.span_warn(titem.span,
+                                //              "deriving(Decodable) is deprecated \
+                                //               in favor of deriving(RustcDecodable)");
+
+                                expand!(decodable::expand_deriving_decodable)
+                            }
 
                             "PartialEq" => expand!(eq::expand_deriving_eq),
                             "Eq" => expand!(totaleq::expand_deriving_totaleq),