rollup merge of #20033: alexcrichton/deprecate-serialise

This commit completes the deprecation story for the in-tree serialization
library. The compiler will now emit a warning whenever it encounters
`deriving(Encodable)` or `deriving(Decodable)`, and the library itself is now
marked `#[unstable]` for when feature staging is enabled.

All users of serialization can migrate to the `rustc-serialize` crate on
crates.io which provides the exact same interface as the libserialize library
in-tree. The new deriving modes are named `RustcEncodable` and `RustcDecodable`
and require `extern crate "rustc-serialize" as rustc_serialize` at the crate
root in order to expand correctly.

To migrate all crates, add the following to your `Cargo.toml`:

    [dependencies]
    rustc-serialize = "0.1.1"

And then add the following to your crate root:

    extern crate "rustc-serialize" as rustc_serialize;

Finally, rename `Encodable` and `Decodable` deriving modes to `RustcEncodable`
and `RustcDecodable`.

[breaking-change]

25 files changed, 288 insertions, 226 deletions

diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs
index 4a1dd121516..4647c92e3d1 100644
--- a/src/librustc/lib.rs
+++ b/src/librustc/lib.rs
@@ -40,6 +40,8 @@ extern crate collections;
 #[phase(plugin, link)] extern crate log;
 #[phase(plugin, link)] extern crate syntax;
 
+extern crate "serialize" as rustc_serialize; // used by deriving
+
 #[cfg(test)]
 extern crate test;
 
diff --git a/src/librustc/middle/def.rs b/src/librustc/middle/def.rs
index a582907612f..a54bc4a945a 100644
--- a/src/librustc/middle/def.rs
+++ b/src/librustc/middle/def.rs
@@ -20,7 +20,7 @@ use syntax::ast_util::local_def;
 
 use std::cell::RefCell;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Def {
     DefFn(ast::DefId, bool /* is_ctor */),
     DefStaticMethod(/* method */ ast::DefId, MethodProvenance),
@@ -73,13 +73,13 @@ pub struct Export {
     pub def_id: ast::DefId, // The definition of the target.
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum MethodProvenance {
     FromTrait(ast::DefId),
     FromImpl(ast::DefId),
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum TyParamProvenance {
     FromSelf(ast::DefId),
     FromParam(ast::DefId),
diff --git a/src/librustc/middle/region.rs b/src/librustc/middle/region.rs
index e0d5a3a50e6..8df78281cc2 100644
--- a/src/librustc/middle/region.rs
+++ b/src/librustc/middle/region.rs
@@ -36,7 +36,8 @@ use syntax::visit::{Visitor, FnKind};
 /// placate the same deriving in `ty::FreeRegion`, but we may want to
 /// actually attach a more meaningful ordering to scopes than the one
 /// generated via deriving here.
-#[deriving(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, PartialOrd, Eq, Ord, Hash, RustcEncodable,
+           RustcDecodable, Show, Copy)]
 pub enum CodeExtent {
     Misc(ast::NodeId)
 }
diff --git a/src/librustc/middle/resolve_lifetime.rs b/src/librustc/middle/resolve_lifetime.rs
index bc9dc6b399d..28cb80df771 100644
--- a/src/librustc/middle/resolve_lifetime.rs
+++ b/src/librustc/middle/resolve_lifetime.rs
@@ -33,7 +33,7 @@ use syntax::visit;
 use syntax::visit::Visitor;
 use util::nodemap::NodeMap;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show)]
 pub enum DefRegion {
     DefStaticRegion,
     DefEarlyBoundRegion(/* space */ subst::ParamSpace,
diff --git a/src/librustc/middle/subst.rs b/src/librustc/middle/subst.rs
index a5e8e4695af..bee6554f2df 100644
--- a/src/librustc/middle/subst.rs
+++ b/src/librustc/middle/subst.rs
@@ -187,8 +187,8 @@ impl RegionSubsts {
 ///////////////////////////////////////////////////////////////////////////
 // ParamSpace
 
-#[deriving(Copy, PartialOrd, Ord, PartialEq, Eq,
-           Clone, Hash, Encodable, Decodable, Show)]
+#[deriving(PartialOrd, Ord, PartialEq, Eq, Copy,
+           Clone, Hash, RustcEncodable, RustcDecodable, Show)]
 pub enum ParamSpace {
     TypeSpace,  // Type parameters attached to a type definition, trait, or impl
     SelfSpace,  // Self parameter on a trait
@@ -224,7 +224,7 @@ impl ParamSpace {
 /// Vector of things sorted by param space. Used to keep
 /// the set of things declared on the type, self, or method
 /// distinct.
-#[deriving(PartialEq, Eq, Clone, Hash, Encodable, Decodable)]
+#[deriving(PartialEq, Eq, Clone, Hash, RustcEncodable, RustcDecodable)]
 pub struct VecPerParamSpace<T> {
     // This was originally represented as a tuple with one Vec<T> for
     // each variant of ParamSpace, and that remains the abstraction
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index edaf2f16721..8632862f26a 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -246,7 +246,7 @@ pub struct mt<'tcx> {
     pub mutbl: ast::Mutability,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show)]
 pub enum TraitStore {
     /// Box<Trait>
     UniqTraitStore,
@@ -277,13 +277,13 @@ pub enum ast_ty_to_ty_cache_entry<'tcx> {
     atttce_resolved(Ty<'tcx>)  /* resolved to a type, irrespective of region */
 }
 
-#[deriving(Clone, PartialEq, Decodable, Encodable)]
+#[deriving(Clone, PartialEq, RustcDecodable, RustcEncodable)]
 pub struct ItemVariances {
     pub types: VecPerParamSpace<Variance>,
     pub regions: VecPerParamSpace<Variance>,
 }
 
-#[deriving(Clone, Copy, PartialEq, Decodable, Encodable, Show)]
+#[deriving(Clone, PartialEq, RustcDecodable, RustcEncodable, Show, Copy)]
 pub enum Variance {
     Covariant,      // T<A> <: T<B> iff A <: B -- e.g., function return type
     Invariant,      // T<A> <: T<B> iff B == A -- e.g., type of mutable cell
@@ -430,7 +430,7 @@ pub fn type_of_adjust<'tcx>(cx: &ctxt<'tcx>, adj: &AutoAdjustment<'tcx>) -> Opti
     }
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, PartialOrd, Show)]
+#[deriving(Clone, Copy, RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Show)]
 pub struct param_index {
     pub space: subst::ParamSpace,
     pub index: uint
@@ -510,7 +510,7 @@ pub struct MethodCall {
     pub adjustment: ExprAdjustment
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Show, Encodable, Decodable)]
+#[deriving(Clone, PartialEq, Eq, Hash, Show, RustcEncodable, RustcDecodable, Copy)]
 pub enum ExprAdjustment {
     NoAdjustment,
     AutoDeref(uint),
@@ -973,7 +973,7 @@ pub struct ParamTy {
 /// is the outer fn.
 ///
 /// [dbi]: http://en.wikipedia.org/wiki/De_Bruijn_index
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show, Copy)]
 pub struct DebruijnIndex {
     // We maintain the invariant that this is never 0. So 1 indicates
     // the innermost binder. To ensure this, create with `DebruijnIndex::new`.
@@ -981,7 +981,7 @@ pub struct DebruijnIndex {
 }
 
 /// Representation of regions:
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show, Copy)]
 pub enum Region {
     // Region bound in a type or fn declaration which will be
     // substituted 'early' -- that is, at the same time when type
@@ -1028,7 +1028,7 @@ pub struct UpvarId {
     pub closure_expr_id: ast::NodeId,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Hash, Show, Encodable, Decodable)]
+#[deriving(Clone, PartialEq, Eq, Hash, Show, RustcEncodable, RustcDecodable, Copy)]
 pub enum BorrowKind {
     /// Data must be immutable and is aliasable.
     ImmBorrow,
@@ -1121,7 +1121,7 @@ pub enum BorrowKind {
 /// - Through mutation, the borrowed upvars can actually escape
 ///   the closure, so sometimes it is necessary for them to be larger
 ///   than the closure lifetime itself.
-#[deriving(Copy, PartialEq, Clone, Encodable, Decodable, Show)]
+#[deriving(PartialEq, Clone, RustcEncodable, RustcDecodable, Show, Copy)]
 pub struct UpvarBorrow {
     pub kind: BorrowKind,
     pub region: ty::Region,
@@ -1146,7 +1146,8 @@ impl Region {
     }
 }
 
-#[deriving(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
+           RustcEncodable, RustcDecodable, Show, Copy)]
 /// A "free" region `fr` can be interpreted as "some region
 /// at least as big as the scope `fr.scope`".
 pub struct FreeRegion {
@@ -1154,7 +1155,8 @@ pub struct FreeRegion {
     pub bound_region: BoundRegion
 }
 
-#[deriving(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Hash, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
+           RustcEncodable, RustcDecodable, Show, Copy)]
 pub enum BoundRegion {
     /// An anonymous region parameter for a given fn (&T)
     BrAnon(uint),
@@ -1412,7 +1414,8 @@ pub struct ExistentialBounds {
 
 pub type BuiltinBounds = EnumSet<BuiltinBound>;
 
-#[deriving(Copy, Clone, Encodable, PartialEq, Eq, Decodable, Hash, Show)]
+#[deriving(Clone, RustcEncodable, PartialEq, Eq, RustcDecodable, Hash,
+           Show, Copy)]
 #[repr(uint)]
 pub enum BuiltinBound {
     BoundSend,
@@ -1463,7 +1466,7 @@ pub struct FloatVid {
     pub index: uint
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
 pub struct RegionVid {
     pub index: uint
 }
@@ -1485,7 +1488,7 @@ pub enum InferTy {
     FreshIntTy(uint),
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, Eq, Hash, Show, Copy)]
 pub enum InferRegion {
     ReVar(RegionVid),
     ReSkolemized(uint, BoundRegion)
@@ -1571,7 +1574,7 @@ pub struct TypeParameterDef<'tcx> {
     pub default: Option<Ty<'tcx>>,
 }
 
-#[deriving(Encodable, Decodable, Clone, Show)]
+#[deriving(RustcEncodable, RustcDecodable, Clone, Show)]
 pub struct RegionParameterDef {
     pub name: ast::Name,
     pub def_id: ast::DefId,
@@ -6223,7 +6226,7 @@ pub fn accumulate_lifetimes_in_type(accumulator: &mut Vec<ty::Region>,
 }
 
 /// A free variable referred to in a function.
-#[deriving(Copy, Encodable, Decodable)]
+#[deriving(Copy, RustcEncodable, RustcDecodable)]
 pub struct Freevar {
     /// The variable being accessed free.
     pub def: def::Def,
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index ac688784f92..ed2b85a34a9 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -113,7 +113,7 @@ impl<T: Clean<U>, U> Clean<Vec<U>> for syntax::owned_slice::OwnedSlice<T> {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Crate {
     pub name: String,
     pub src: FsPath,
@@ -195,7 +195,7 @@ impl<'a, 'tcx> Clean<Crate> for visit_ast::RustdocVisitor<'a, 'tcx> {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct ExternalCrate {
     pub name: String,
     pub attrs: Vec<Attribute>,
@@ -228,7 +228,7 @@ impl Clean<ExternalCrate> for cstore::crate_metadata {
 /// Anything with a source location and set of attributes and, optionally, a
 /// name. That is, anything that can be documented. This doesn't correspond
 /// directly to the AST's concept of an item; it's a strict superset.
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Item {
     /// Stringified span
     pub source: Span,
@@ -304,7 +304,7 @@ impl Item {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum ItemEnum {
     StructItem(Struct),
     EnumItem(Enum),
@@ -333,7 +333,7 @@ pub enum ItemEnum {
     AssociatedTypeItem(TyParam),
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Module {
     pub items: Vec<Item>,
     pub is_crate: bool,
@@ -400,7 +400,7 @@ impl Clean<Item> for doctree::Module {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub enum Attribute {
     Word(String),
     List(String, Vec<Attribute> ),
@@ -453,7 +453,7 @@ impl<'a> attr::AttrMetaMethods for &'a Attribute {
     fn meta_item_list(&self) -> Option<&[P<ast::MetaItem>]> { None }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct TyParam {
     pub name: String,
     pub did: ast::DefId,
@@ -490,7 +490,7 @@ impl<'tcx> Clean<TyParam> for ty::TypeParameterDef<'tcx> {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub enum TyParamBound {
     RegionBound(Lifetime),
     TraitBound(Type)
@@ -632,7 +632,7 @@ impl<'tcx> Clean<Option<Vec<TyParamBound>>> for subst::Substs<'tcx> {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct Lifetime(String);
 
 impl Lifetime {
@@ -682,7 +682,7 @@ impl Clean<Option<Lifetime>> for ty::Region {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct WherePredicate {
     pub ty: Type,
     pub bounds: Vec<TyParamBound>
@@ -706,7 +706,7 @@ impl Clean<WherePredicate> for ast::WherePredicate {
 }
 
 // maybe use a Generic enum and use ~[Generic]?
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct Generics {
     pub lifetimes: Vec<Lifetime>,
     pub type_params: Vec<TyParam>,
@@ -734,7 +734,7 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics<'tcx>, subst::ParamSpace) {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Method {
     pub generics: Generics,
     pub self_: SelfTy,
@@ -773,7 +773,7 @@ impl Clean<Item> for ast::Method {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct TyMethod {
     pub unsafety: ast::Unsafety,
     pub decl: FnDecl,
@@ -811,7 +811,7 @@ impl Clean<Item> for ast::TypeMethod {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub enum SelfTy {
     SelfStatic,
     SelfValue,
@@ -832,7 +832,7 @@ impl Clean<SelfTy> for ast::ExplicitSelf_ {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Function {
     pub decl: FnDecl,
     pub generics: Generics,
@@ -857,7 +857,7 @@ impl Clean<Item> for doctree::Function {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct ClosureDecl {
     pub lifetimes: Vec<Lifetime>,
     pub decl: FnDecl,
@@ -878,14 +878,14 @@ impl Clean<ClosureDecl> for ast::ClosureTy {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct FnDecl {
     pub inputs: Arguments,
     pub output: FunctionRetTy,
     pub attrs: Vec<Attribute>,
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct Arguments {
     pub values: Vec<Argument>,
 }
@@ -938,7 +938,7 @@ impl<'a, 'tcx> Clean<FnDecl> for (ast::DefId, &'a ty::PolyFnSig<'tcx>) {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct Argument {
     pub type_: Type,
     pub name: String,
@@ -955,7 +955,7 @@ impl Clean<Argument> for ast::Arg {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub enum FunctionRetTy {
     Return(Type),
     NoReturn
@@ -970,7 +970,7 @@ impl Clean<FunctionRetTy> for ast::FunctionRetTy {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Trait {
     pub unsafety: ast::Unsafety,
     pub items: Vec<TraitMethod>,
@@ -1014,7 +1014,7 @@ impl Clean<Type> for ast::PolyTraitRef {
 
 /// An item belonging to a trait, whether a method or associated. Could be named
 /// TraitItem except that's already taken by an exported enum variant.
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum TraitMethod {
     RequiredMethod(Item),
     ProvidedMethod(Item),
@@ -1059,7 +1059,7 @@ impl Clean<TraitMethod> for ast::TraitItem {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum ImplMethod {
     MethodImplItem(Item),
     TypeImplItem(Item),
@@ -1132,7 +1132,7 @@ impl<'tcx> Clean<Item> for ty::ImplOrTraitItem<'tcx> {
 /// A representation of a Type suitable for hyperlinking purposes. Ideally one can get the original
 /// type out of the AST/ty::ctxt given one of these, if more information is needed. Most importantly
 /// it does not preserve mutability or boxes.
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub enum Type {
     /// structs/enums/traits (anything that'd be an ast::TyPath)
     ResolvedPath {
@@ -1180,7 +1180,7 @@ pub enum Type {
     PolyTraitRef(Vec<TyParamBound>),
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Eq, Hash)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Copy)]
 pub enum PrimitiveType {
     Int, I8, I16, I32, I64,
     Uint, U8, U16, U32, U64,
@@ -1192,7 +1192,7 @@ pub enum PrimitiveType {
     PrimitiveTuple,
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, Copy)]
 pub enum TypeKind {
     TypeEnum,
     TypeFunction,
@@ -1436,7 +1436,7 @@ impl Clean<Type> for ast::QPath {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum StructField {
     HiddenStructField, // inserted later by strip passes
     TypedStructField(Type),
@@ -1495,7 +1495,7 @@ impl Clean<Option<Visibility>> for ast::Visibility {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Struct {
     pub struct_type: doctree::StructType,
     pub generics: Generics,
@@ -1525,7 +1525,7 @@ impl Clean<Item> for doctree::Struct {
 /// This is a more limited form of the standard Struct, different in that
 /// it lacks the things most items have (name, id, parameterization). Found
 /// only as a variant in an enum.
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct VariantStruct {
     pub struct_type: doctree::StructType,
     pub fields: Vec<Item>,
@@ -1542,7 +1542,7 @@ impl Clean<VariantStruct> for syntax::ast::StructDef {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Enum {
     pub variants: Vec<Item>,
     pub generics: Generics,
@@ -1567,7 +1567,7 @@ impl Clean<Item> for doctree::Enum {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Variant {
     pub kind: VariantKind,
 }
@@ -1635,7 +1635,7 @@ impl<'tcx> Clean<Item> for ty::VariantInfo<'tcx> {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum VariantKind {
     CLikeVariant,
     TupleVariant(Vec<Type>),
@@ -1657,7 +1657,7 @@ impl Clean<VariantKind> for ast::VariantKind {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, Show)]
 pub struct Span {
     pub filename: String,
     pub loline: uint,
@@ -1692,7 +1692,7 @@ impl Clean<Span> for syntax::codemap::Span {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct Path {
     pub global: bool,
     pub segments: Vec<PathSegment>,
@@ -1707,7 +1707,7 @@ impl Clean<Path> for ast::Path {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct PathSegment {
     pub name: String,
     pub lifetimes: Vec<Lifetime>,
@@ -1763,7 +1763,7 @@ impl Clean<String> for ast::Name {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Typedef {
     pub type_: Type,
     pub generics: Generics,
@@ -1786,7 +1786,7 @@ impl Clean<Item> for doctree::Typedef {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq)]
 pub struct BareFunctionDecl {
     pub unsafety: ast::Unsafety,
     pub generics: Generics,
@@ -1809,7 +1809,7 @@ impl Clean<BareFunctionDecl> for ast::BareFnTy {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, Show)]
 pub struct Static {
     pub type_: Type,
     pub mutability: Mutability,
@@ -1838,7 +1838,7 @@ impl Clean<Item> for doctree::Static {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, Show)]
 pub struct Constant {
     pub type_: Type,
     pub expr: String,
@@ -1861,7 +1861,7 @@ impl Clean<Item> for doctree::Constant {
     }
 }
 
-#[deriving(Copy, Show, Clone, Encodable, Decodable, PartialEq)]
+#[deriving(Show, Clone, RustcEncodable, RustcDecodable, PartialEq, Copy)]
 pub enum Mutability {
     Mutable,
     Immutable,
@@ -1876,7 +1876,7 @@ impl Clean<Mutability> for ast::Mutability {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Impl {
     pub generics: Generics,
     pub trait_: Option<Type>,
@@ -1914,7 +1914,7 @@ impl Clean<Item> for doctree::Impl {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct ViewItem {
     pub inner: ViewItemInner,
 }
@@ -1980,7 +1980,7 @@ impl Clean<Vec<Item>> for ast::ViewItem {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum ViewItemInner {
     ExternCrate(String, Option<String>, ast::NodeId),
     Import(ViewPath)
@@ -2003,7 +2003,7 @@ impl Clean<ViewItemInner> for ast::ViewItem_ {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub enum ViewPath {
     // use source as str;
     SimpleImport(String, ImportSource),
@@ -2013,7 +2013,7 @@ pub enum ViewPath {
     ImportList(ImportSource, Vec<ViewListIdent>),
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct ImportSource {
     pub path: Path,
     pub did: Option<ast::DefId>,
@@ -2034,7 +2034,7 @@ impl Clean<ViewPath> for ast::ViewPath {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct ViewListIdent {
     pub name: String,
     pub source: Option<ast::DefId>,
@@ -2247,7 +2247,7 @@ fn resolve_def(cx: &DocContext, id: ast::NodeId) -> Option<ast::DefId> {
     })
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Macro {
     pub source: String,
 }
@@ -2268,7 +2268,7 @@ impl Clean<Item> for doctree::Macro {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable)]
+#[deriving(Clone, RustcEncodable, RustcDecodable)]
 pub struct Stability {
     pub level: attr::StabilityLevel,
     pub text: String
diff --git a/src/librustdoc/doctree.rs b/src/librustdoc/doctree.rs
index 83552884d7f..7f7c055062a 100644
--- a/src/librustdoc/doctree.rs
+++ b/src/librustdoc/doctree.rs
@@ -70,7 +70,7 @@ impl Module {
     }
 }
 
-#[deriving(Copy, Show, Clone, Encodable, Decodable)]
+#[deriving(Show, Clone, RustcEncodable, RustcDecodable, Copy)]
 pub enum StructType {
     /// A normal struct
     Plain,
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 182c83d805c..8dfb352d028 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -32,6 +32,8 @@ extern crate syntax;
 extern crate "test" as testing;
 #[phase(plugin, link)] extern crate log;
 
+extern crate "serialize" as rustc_serialize; // used by deriving
+
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::collections::hash_map::Entry::{Occupied, Vacant};
diff --git a/src/librustdoc/stability_summary.rs b/src/librustdoc/stability_summary.rs
index 2f3079f75b9..2e3adf8e767 100644
--- a/src/librustdoc/stability_summary.rs
+++ b/src/librustdoc/stability_summary.rs
@@ -25,7 +25,7 @@ use clean::{TypeTraitItem, ViewItemItem, PrimitiveItem, Stability};
 
 use html::render::cache;
 
-#[deriving(Zero, Encodable, Decodable, PartialEq, Eq)]
+#[deriving(Zero, RustcEncodable, RustcDecodable, PartialEq, Eq)]
 /// The counts for each stability level.
 #[deriving(Copy)]
 pub struct Counts {
@@ -73,7 +73,7 @@ impl Counts {
     }
 }
 
-#[deriving(Encodable, Decodable, PartialEq, Eq)]
+#[deriving(RustcEncodable, RustcDecodable, PartialEq, Eq)]
 /// A summarized module, which includes total counts and summarized children
 /// modules.
 pub struct ModuleSummary {
diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index c4f071994dc..b945bced512 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -57,17 +57,17 @@
 //!
 //! Rust provides a mechanism for low boilerplate encoding & decoding of values to and from JSON via
 //! the serialization API.
-//! To be able to encode a piece of data, it must implement the `serialize::Encodable` trait.
-//! To be able to decode a piece of data, it must implement the `serialize::Decodable` trait.
+//! To be able to encode a piece of data, it must implement the `serialize::RustcEncodable` trait.
+//! To be able to decode a piece of data, it must implement the `serialize::RustcDecodable` trait.
 //! The Rust compiler provides an annotation to automatically generate the code for these traits:
-//! `#[deriving(Decodable, Encodable)]`
+//! `#[deriving(RustcDecodable, RustcEncodable)]`
 //!
 //! The JSON API provides an enum `json::Json` and a trait `ToJson` to encode objects.
 //! The `ToJson` trait provides a `to_json` method to convert an object into a `json::Json` value.
 //! A `json::Json` value can be encoded as a string or buffer using the functions described above.
 //! You can also use the `json::Encoder` object, which implements the `Encoder` trait.
 //!
-//! When using `ToJson` the `Encodable` trait implementation is not mandatory.
+//! When using `ToJson` the `RustcEncodable` trait implementation is not mandatory.
 //!
 //! # Examples of use
 //!
@@ -127,7 +127,7 @@
 //!     }
 //! }
 //!
-//! // Only generate `Encodable` trait implementation
+//! // Only generate `RustcEncodable` trait implementation
 //! #[deriving(Encodable)]
 //! pub struct ComplexNumRecord {
 //!     uid: u8,
@@ -405,7 +405,7 @@ impl<'a> Encoder<'a> {
     }
 
     /// Encode the specified struct into a json [u8]
-    pub fn buffer_encode<T:Encodable<Encoder<'a>, io::IoError>>(object: &T) -> Vec<u8>  {
+    pub fn buffer_encode<T: Encodable<Encoder<'a>, io::IoError>>(object: &T) -> Vec<u8>  {
         //Serialize the object in a string using a writer
         let mut m = Vec::new();
         // FIXME(14302) remove the transmute and unsafe block.
@@ -2428,7 +2428,7 @@ mod tests {
     use std::num::Float;
     use std::string;
 
-    #[deriving(Decodable, Eq, PartialEq, Show)]
+    #[deriving(RustcDecodable, Eq, PartialEq, Show)]
     struct OptionData {
         opt: Option<uint>,
     }
@@ -2455,20 +2455,20 @@ mod tests {
                                 ExpectedError("Number".to_string(), "false".to_string()));
     }
 
-    #[deriving(PartialEq, Encodable, Decodable, Show)]
+    #[deriving(PartialEq, RustcEncodable, RustcDecodable, Show)]
     enum Animal {
         Dog,
         Frog(string::String, int)
     }
 
-    #[deriving(PartialEq, Encodable, Decodable, Show)]
+    #[deriving(PartialEq, RustcEncodable, RustcDecodable, Show)]
     struct Inner {
         a: (),
         b: uint,
         c: Vec<string::String>,
     }
 
-    #[deriving(PartialEq, Encodable, Decodable, Show)]
+    #[deriving(PartialEq, RustcEncodable, RustcDecodable, Show)]
     struct Outer {
         inner: Vec<Inner>,
     }
@@ -3009,7 +3009,7 @@ mod tests {
         );
     }
 
-    #[deriving(Decodable)]
+    #[deriving(RustcDecodable)]
     struct FloatStruct {
         f: f64,
         a: Vec<f64>
@@ -3058,7 +3058,7 @@ mod tests {
             Err(SyntaxError(EOFWhileParsingObject, 3u, 8u)));
     }
 
-    #[deriving(Decodable)]
+    #[deriving(RustcDecodable)]
     #[allow(dead_code)]
     struct DecodeStruct {
         x: f64,
@@ -3066,7 +3066,7 @@ mod tests {
         z: string::String,
         w: Vec<DecodeStruct>
     }
-    #[deriving(Decodable)]
+    #[deriving(RustcDecodable)]
     enum DecodeEnum {
         A(f64),
         B(string::String)
diff --git a/src/libserialize/lib.rs b/src/libserialize/lib.rs
index fdbc5051f72..4a2bbbeec03 100644
--- a/src/libserialize/lib.rs
+++ b/src/libserialize/lib.rs
@@ -15,7 +15,7 @@ Core encoding and decoding interfaces.
 */
 
 #![crate_name = "serialize"]
-#![experimental]
+#![unstable = "deprecated in favor of rustc-serialize on crates.io"]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
@@ -45,3 +45,7 @@ mod collection_impls;
 pub mod base64;
 pub mod hex;
 pub mod json;
+
+mod rustc_serialize {
+    pub use serialize::*;
+}
diff --git a/src/libsyntax/abi.rs b/src/libsyntax/abi.rs
index 70bad90aea1..b1599cb807d 100644
--- a/src/libsyntax/abi.rs
+++ b/src/libsyntax/abi.rs
@@ -26,7 +26,7 @@ pub enum Os {
     OsDragonfly,
 }
 
-#[deriving(Copy, PartialEq, Eq, Hash, Encodable, Decodable, Clone)]
+#[deriving(PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Clone, Copy)]
 pub enum Abi {
     // NB: This ordering MUST match the AbiDatas array below.
     // (This is ensured by the test indices_are_correct().)
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 3eea5b27f19..9d4bf77d4a5 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -157,7 +157,8 @@ pub const ILLEGAL_CTXT : SyntaxContext = 1;
 
 /// A name is a part of an identifier, representing a string or gensym. It's
 /// the result of interning.
-#[deriving(Copy, Eq, Ord, PartialEq, PartialOrd, Hash, Encodable, Decodable, Clone)]
+#[deriving(Eq, Ord, PartialEq, PartialOrd, Hash,
+           RustcEncodable, RustcDecodable, Clone, Copy)]
 pub struct Name(pub u32);
 
 impl Name {
@@ -187,7 +188,7 @@ impl<S: Encoder<E>, E> Encodable<S, E> for Ident {
     }
 }
 
-impl<D:Decoder<E>, E> Decodable<D, E> for Ident {
+impl<D: Decoder<E>, E> Decodable<D, E> for Ident {
     fn decode(d: &mut D) -> Result<Ident, E> {
         Ok(str_to_ident(try!(d.read_str())[]))
     }
@@ -196,14 +197,15 @@ impl<D:Decoder<E>, E> Decodable<D, E> for Ident {
 /// Function name (not all functions have names)
 pub type FnIdent = Option<Ident>;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,
+           Show, Copy)]
 pub struct Lifetime {
     pub id: NodeId,
     pub span: Span,
     pub name: Name
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct LifetimeDef {
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>
@@ -212,7 +214,7 @@ pub struct LifetimeDef {
 /// A "Path" is essentially Rust's notion of a name; for instance:
 /// std::cmp::PartialEq  .  It's represented as a sequence of identifiers,
 /// along with a bunch of supporting information.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Path {
     pub span: Span,
     /// A `::foo` path, is relative to the crate root rather than current
@@ -224,7 +226,7 @@ pub struct Path {
 
 /// A segment of a path: an identifier, an optional lifetime, and a set of
 /// types.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct PathSegment {
     /// The identifier portion of this path segment.
     pub identifier: Ident,
@@ -237,7 +239,7 @@ pub struct PathSegment {
     pub parameters: PathParameters,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum PathParameters {
     AngleBracketedParameters(AngleBracketedParameterData),
     ParenthesizedParameters(ParenthesizedParameterData),
@@ -315,7 +317,7 @@ impl PathParameters {
 }
 
 /// A path like `Foo<'a, T>`
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct AngleBracketedParameterData {
     /// The lifetime parameters for this path segment.
     pub lifetimes: Vec<Lifetime>,
@@ -333,7 +335,7 @@ impl AngleBracketedParameterData {
 }
 
 /// A path like `Foo(A,B) -> C`
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct ParenthesizedParameterData {
     /// `(A,B)`
     pub inputs: Vec<P<Ty>>,
@@ -346,7 +348,8 @@ pub type CrateNum = u32;
 
 pub type NodeId = u32;
 
-#[deriving(Clone, Copy, Eq, Ord, PartialOrd, PartialEq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Eq, Ord, PartialOrd, PartialEq, RustcEncodable,
+           RustcDecodable, Hash, Show, Copy)]
 pub struct DefId {
     pub krate: CrateNum,
     pub node: NodeId,
@@ -366,7 +369,7 @@ pub const DUMMY_NODE_ID: NodeId = -1;
 /// typeck::collect::compute_bounds matches these against
 /// the "special" built-in traits (see middle::lang_items) and
 /// detects Copy, Send and Sync.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum TyParamBound {
     TraitTyParamBound(PolyTraitRef),
     RegionTyParamBound(Lifetime)
@@ -374,7 +377,7 @@ pub enum TyParamBound {
 
 pub type TyParamBounds = OwnedSlice<TyParamBound>;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct TyParam {
     pub ident: Ident,
     pub id: NodeId,
@@ -386,7 +389,7 @@ pub struct TyParam {
 
 /// Represents lifetimes and type parameters attached to a declaration
 /// of a function, enum, trait, etc.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Generics {
     pub lifetimes: Vec<LifetimeDef>,
     pub ty_params: OwnedSlice<TyParam>,
@@ -405,34 +408,34 @@ impl Generics {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct WhereClause {
     pub id: NodeId,
     pub predicates: Vec<WherePredicate>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum WherePredicate {
     BoundPredicate(WhereBoundPredicate),
     RegionPredicate(WhereRegionPredicate),
     EqPredicate(WhereEqPredicate)
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct WhereBoundPredicate {
     pub span: Span,
     pub bounded_ty: P<Ty>,
     pub bounds: OwnedSlice<TyParamBound>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct WhereRegionPredicate {
     pub span: Span,
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct WhereEqPredicate {
     pub id: NodeId,
     pub span: Span,
@@ -444,7 +447,7 @@ pub struct WhereEqPredicate {
 /// used to drive conditional compilation
 pub type CrateConfig = Vec<P<MetaItem>> ;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Crate {
     pub module: Mod,
     pub attrs: Vec<Attribute>,
@@ -455,7 +458,7 @@ pub struct Crate {
 
 pub type MetaItem = Spanned<MetaItem_>;
 
-#[deriving(Clone, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum MetaItem_ {
     MetaWord(InternedString),
     MetaList(InternedString, Vec<P<MetaItem>>),
@@ -487,7 +490,7 @@ impl PartialEq for MetaItem_ {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Block {
     pub view_items: Vec<ViewItem>,
     pub stmts: Vec<P<Stmt>>,
@@ -497,27 +500,27 @@ pub struct Block {
     pub span: Span,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Pat {
     pub id: NodeId,
     pub node: Pat_,
     pub span: Span,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct FieldPat {
     pub ident: Ident,
     pub pat: P<Pat>,
     pub is_shorthand: bool,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum BindingMode {
     BindByRef(Mutability),
     BindByValue(Mutability),
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum PatWildKind {
     /// Represents the wildcard pattern `_`
     PatWildSingle,
@@ -526,7 +529,7 @@ pub enum PatWildKind {
     PatWildMulti,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Pat_ {
     /// Represents a wildcard pattern (either `_` or `..`)
     PatWild(PatWildKind),
@@ -555,13 +558,13 @@ pub enum Pat_ {
     PatMac(Mac),
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum Mutability {
     MutMutable,
     MutImmutable,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum BinOp {
     BiAdd,
     BiSub,
@@ -583,7 +586,7 @@ pub enum BinOp {
     BiGt,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum UnOp {
     UnUniq,
     UnDeref,
@@ -593,7 +596,7 @@ pub enum UnOp {
 
 pub type Stmt = Spanned<Stmt_>;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Stmt_ {
     /// Could be an item or a local (let) binding:
     StmtDecl(P<Decl>, NodeId),
@@ -607,7 +610,7 @@ pub enum Stmt_ {
     StmtMac(Mac, MacStmtStyle),
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum MacStmtStyle {
     /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
     /// `foo!(...);`, `foo![...];`
@@ -622,7 +625,7 @@ pub enum MacStmtStyle {
 
 /// Where a local declaration came from: either a true `let ... =
 /// ...;`, or one desugared from the pattern of a for loop.
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum LocalSource {
     LocalLet,
     LocalFor,
@@ -631,7 +634,7 @@ pub enum LocalSource {
 // FIXME (pending discussion of #1697, #2178...): local should really be
 // a refinement on pat.
 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Local {
     pub ty: P<Ty>,
     pub pat: P<Pat>,
@@ -643,7 +646,7 @@ pub struct Local {
 
 pub type Decl = Spanned<Decl_>;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Decl_ {
     /// A local (let) binding:
     DeclLocal(P<Local>),
@@ -652,7 +655,7 @@ pub enum Decl_ {
 }
 
 /// represents one arm of a 'match'
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Arm {
     pub attrs: Vec<Attribute>,
     pub pats: Vec<P<Pat>>,
@@ -660,7 +663,7 @@ pub struct Arm {
     pub body: P<Expr>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Field {
     pub ident: SpannedIdent,
     pub expr: P<Expr>,
@@ -669,26 +672,26 @@ pub struct Field {
 
 pub type SpannedIdent = Spanned<Ident>;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum BlockCheckMode {
     DefaultBlock,
     UnsafeBlock(UnsafeSource),
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum UnsafeSource {
     CompilerGenerated,
     UserProvided,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Expr {
     pub id: NodeId,
     pub node: Expr_,
     pub span: Span,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Expr_ {
     /// First expr is the place; second expr is the value.
     ExprBox(Option<P<Expr>>, P<Expr>),
@@ -750,28 +753,28 @@ pub enum Expr_ {
 ///     <Vec<T> as SomeTrait>::SomeAssociatedItem
 ///      ^~~~~     ^~~~~~~~~   ^~~~~~~~~~~~~~~~~~
 ///      self_type  trait_name  item_name
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct QPath {
     pub self_type: P<Ty>,
     pub trait_ref: P<TraitRef>,
     pub item_name: Ident,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum MatchSource {
     Normal,
     IfLetDesugar { contains_else_clause: bool },
     WhileLetDesugar,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum CaptureClause {
     CaptureByValue,
     CaptureByRef,
 }
 
 /// A delimited sequence of token trees
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Delimited {
     /// The type of delimiter
     pub delim: token::DelimToken,
@@ -806,7 +809,7 @@ impl Delimited {
 }
 
 /// A sequence of token treesee
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct SequenceRepetition {
     /// The sequence of token trees
     pub tts: Vec<TokenTree>,
@@ -820,7 +823,7 @@ pub struct SequenceRepetition {
 
 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
 /// for token sequences.
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum KleeneOp {
     ZeroOrMore,
     OneOrMore,
@@ -838,7 +841,7 @@ pub enum KleeneOp {
 ///
 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 #[doc="For macro invocations; parsing is delegated to the macro"]
 pub enum TokenTree {
     /// A single token
@@ -928,14 +931,14 @@ pub type Mac = Spanned<Mac_>;
 /// is being invoked, and the vector of token-trees contains the source
 /// of the macro invocation.
 /// There's only one flavor, now, so this could presumably be simplified.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Mac_ {
     // NB: the additional ident for a macro_rules-style macro is actually
     // stored in the enclosing item. Oog.
     MacInvocTT(Path, Vec<TokenTree> , SyntaxContext),   // new macro-invocation
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum StrStyle {
     CookedStr,
     RawStr(uint)
@@ -943,7 +946,7 @@ pub enum StrStyle {
 
 pub type Lit = Spanned<Lit_>;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum Sign {
     Minus,
     Plus
@@ -959,7 +962,7 @@ impl<T> Sign where T: Int {
     }
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum LitIntType {
     SignedIntLit(IntTy, Sign),
     UnsignedIntLit(UintTy),
@@ -976,7 +979,7 @@ impl LitIntType {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Lit_ {
     LitStr(InternedString, StrStyle),
     LitBinary(Rc<Vec<u8> >),
@@ -990,13 +993,13 @@ pub enum Lit_ {
 
 // NB: If you change this, you'll probably want to change the corresponding
 // type structure in middle/ty.rs as well.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct MutTy {
     pub ty: P<Ty>,
     pub mutbl: Mutability,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct TypeField {
     pub ident: Ident,
     pub mt: MutTy,
@@ -1005,7 +1008,7 @@ pub struct TypeField {
 
 /// Represents a required method in a trait declaration,
 /// one without a default implementation
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct TypeMethod {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1023,26 +1026,26 @@ pub struct TypeMethod {
 /// a default implementation A trait method is either required (meaning it
 /// doesn't have an implementation, just a signature) or provided (meaning it
 /// has a default implementation).
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum TraitItem {
     RequiredMethod(TypeMethod),
     ProvidedMethod(P<Method>),
     TypeTraitItem(P<AssociatedType>),
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum ImplItem {
     MethodImplItem(P<Method>),
     TypeImplItem(P<Typedef>),
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct AssociatedType {
     pub attrs: Vec<Attribute>,
     pub ty_param: TyParam,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Typedef {
     pub id: NodeId,
     pub span: Span,
@@ -1052,7 +1055,7 @@ pub struct Typedef {
     pub typ: P<Ty>,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
 pub enum IntTy {
     TyI,
     TyI8,
@@ -1077,7 +1080,7 @@ impl IntTy {
     }
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
 pub enum UintTy {
     TyU,
     TyU8,
@@ -1102,7 +1105,7 @@ impl fmt::Show for UintTy {
     }
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
 pub enum FloatTy {
     TyF32,
     TyF64,
@@ -1123,7 +1126,7 @@ impl FloatTy {
 }
 
 // Bind a type to an associated type: `A=Foo`.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct TypeBinding {
     pub id: NodeId,
     pub ident: Ident,
@@ -1133,7 +1136,7 @@ pub struct TypeBinding {
 
 
 // NB PartialEq method appears below.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Ty {
     pub id: NodeId,
     pub node: Ty_,
@@ -1141,7 +1144,7 @@ pub struct Ty {
 }
 
 /// Not represented directly in the AST, referred to by name through a ty_path.
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum PrimTy {
     TyInt(IntTy),
     TyUint(UintTy),
@@ -1151,7 +1154,7 @@ pub enum PrimTy {
     TyChar
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
 pub enum Onceness {
     Once,
     Many
@@ -1167,7 +1170,7 @@ impl fmt::Show for Onceness {
 }
 
 /// Represents the type of a closure
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct ClosureTy {
     pub lifetimes: Vec<LifetimeDef>,
     pub unsafety: Unsafety,
@@ -1176,7 +1179,7 @@ pub struct ClosureTy {
     pub bounds: TyParamBounds,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct BareFnTy {
     pub unsafety: Unsafety,
     pub abi: Abi,
@@ -1184,7 +1187,7 @@ pub struct BareFnTy {
     pub decl: P<FnDecl>
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 /// The different kinds of types recognized by the compiler
 pub enum Ty_ {
     TyVec(P<Ty>),
@@ -1219,13 +1222,13 @@ pub enum Ty_ {
     TyInfer,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum AsmDialect {
     AsmAtt,
     AsmIntel
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct InlineAsm {
     pub asm: InternedString,
     pub asm_str_style: StrStyle,
@@ -1239,7 +1242,7 @@ pub struct InlineAsm {
 }
 
 /// represents an argument in a function header
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Arg {
     pub ty: P<Ty>,
     pub pat: P<Pat>,
@@ -1267,14 +1270,14 @@ impl Arg {
 }
 
 /// represents the header (not the body) of a function declaration
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct FnDecl {
     pub inputs: Vec<Arg>,
     pub output: FunctionRetTy,
     pub variadic: bool
 }
 
-#[deriving(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Hash)]
+#[deriving(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
 pub enum Unsafety {
     Unsafe,
     Normal,
@@ -1289,7 +1292,7 @@ impl fmt::Show for Unsafety {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum FunctionRetTy {
     /// Functions with return type ! that always
     /// raise an error or exit (i.e. never return to the caller)
@@ -1308,7 +1311,7 @@ impl FunctionRetTy {
 }
 
 /// Represents the kind of 'self' associated with a method
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum ExplicitSelf_ {
     /// No self
     SelfStatic,
@@ -1322,7 +1325,7 @@ pub enum ExplicitSelf_ {
 
 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Method {
     pub attrs: Vec<Attribute>,
     pub id: NodeId,
@@ -1330,7 +1333,7 @@ pub struct Method {
     pub node: Method_,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Method_ {
     /// Represents a method declaration
     MethDecl(Ident,
@@ -1345,7 +1348,7 @@ pub enum Method_ {
     MethMac(Mac),
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Mod {
     /// A span from the first token past `{` to the last token until `}`.
     /// For `mod foo;`, the inner span ranges from the first token
@@ -1355,31 +1358,31 @@ pub struct Mod {
     pub items: Vec<P<Item>>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct ForeignMod {
     pub abi: Abi,
     pub view_items: Vec<ViewItem>,
     pub items: Vec<P<ForeignItem>>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct VariantArg {
     pub ty: P<Ty>,
     pub id: NodeId,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum VariantKind {
     TupleVariantKind(Vec<VariantArg>),
     StructVariantKind(P<StructDef>),
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct EnumDef {
     pub variants: Vec<P<Variant>>,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Variant_ {
     pub name: Ident,
     pub attrs: Vec<Attribute>,
@@ -1391,7 +1394,7 @@ pub struct Variant_ {
 
 pub type Variant = Spanned<Variant_>;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum PathListItem_ {
     PathListIdent { name: Ident, id: NodeId },
     PathListMod { id: NodeId }
@@ -1409,7 +1412,7 @@ pub type PathListItem = Spanned<PathListItem_>;
 
 pub type ViewPath = Spanned<ViewPath_>;
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum ViewPath_ {
 
     /// `foo::bar::baz as quux`
@@ -1426,7 +1429,7 @@ pub enum ViewPath_ {
     ViewPathList(Path, Vec<PathListItem> , NodeId)
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct ViewItem {
     pub node: ViewItem_,
     pub attrs: Vec<Attribute>,
@@ -1434,7 +1437,7 @@ pub struct ViewItem {
     pub span: Span,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum ViewItem_ {
     /// Ident: name used to refer to this crate in the code
     /// optional (InternedString,StrStyle): if present, this is a location
@@ -1450,17 +1453,17 @@ pub type Attribute = Spanned<Attribute_>;
 /// Distinguishes between Attributes that decorate items and Attributes that
 /// are contained as statements within items. These two cases need to be
 /// distinguished for pretty-printing.
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum AttrStyle {
     AttrOuter,
     AttrInner,
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub struct AttrId(pub uint);
 
 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Attribute_ {
     pub id: AttrId,
     pub style: AttrStyle,
@@ -1473,13 +1476,13 @@ pub struct Attribute_ {
 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
 /// same as the impl's node id).
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct TraitRef {
     pub path: Path,
     pub ref_id: NodeId,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct PolyTraitRef {
     /// The `'a` in `<'a> Foo<&'a T>`
     pub bound_lifetimes: Vec<LifetimeDef>,
@@ -1488,7 +1491,7 @@ pub struct PolyTraitRef {
     pub trait_ref: TraitRef
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum Visibility {
     Public,
     Inherited,
@@ -1503,7 +1506,7 @@ impl Visibility {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct StructField_ {
     pub kind: StructFieldKind,
     pub id: NodeId,
@@ -1522,7 +1525,7 @@ impl StructField_ {
 
 pub type StructField = Spanned<StructField_>;
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum StructFieldKind {
     NamedField(Ident, Visibility),
     /// Element of a tuple-like struct
@@ -1538,7 +1541,7 @@ impl StructFieldKind {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct StructDef {
     /// Fields, not including ctor
     pub fields: Vec<StructField>,
@@ -1551,7 +1554,7 @@ pub struct StructDef {
   FIXME (#3300): Should allow items to be anonymous. Right now
   we just use dummy names for anon items.
  */
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct Item {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1561,7 +1564,7 @@ pub struct Item {
     pub span: Span,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Item_ {
     ItemStatic(P<Ty>, Mutability, P<Expr>),
     ItemConst(P<Ty>, P<Expr>),
@@ -1605,7 +1608,7 @@ impl Item_ {
     }
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub struct ForeignItem {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1615,7 +1618,7 @@ pub struct ForeignItem {
     pub vis: Visibility,
 }
 
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum ForeignItem_ {
     ForeignItemFn(P<FnDecl>, Generics),
     ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
@@ -1630,7 +1633,7 @@ impl ForeignItem_ {
     }
 }
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum UnboxedClosureKind {
     FnUnboxedClosureKind,
     FnMutUnboxedClosureKind,
@@ -1640,7 +1643,7 @@ pub enum UnboxedClosureKind {
 /// The data we save and restore about an inlined item or method.  This is not
 /// part of the AST that we parse from a file, but it becomes part of the tree
 /// that we trans.
-#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum InlinedItem {
     IIItem(P<Item>),
     IITraitItem(DefId /* impl id */, TraitItem),
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 5727866d6ec..9196055267f 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -343,7 +343,7 @@ pub fn empty_generics() -> Generics {
 // ______________________________________________________________________
 // Enumerating the IDs which appear in an AST
 
-#[deriving(Copy, Encodable, Decodable, Show)]
+#[deriving(RustcEncodable, RustcDecodable, Show, Copy)]
 pub struct IdRange {
     pub min: NodeId,
     pub max: NodeId,
diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index b1158917b72..df820b40cb6 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -340,14 +340,14 @@ pub fn cfg_matches(diagnostic: &SpanHandler, cfgs: &[P<MetaItem>], cfg: &ast::Me
 }
 
 /// Represents the #[deprecated="foo"] and friends attributes.
-#[deriving(Encodable,Decodable,Clone,Show)]
+#[deriving(RustcEncodable,RustcDecodable,Clone,Show)]
 pub struct Stability {
     pub level: StabilityLevel,
     pub text: Option<InternedString>
 }
 
 /// The available stability levels.
-#[deriving(Copy,Encodable,Decodable,PartialEq,PartialOrd,Clone,Show)]
+#[deriving(RustcEncodable,RustcDecodable,PartialEq,PartialOrd,Clone,Show,Copy)]
 pub enum StabilityLevel {
     Deprecated,
     Experimental,
@@ -463,7 +463,7 @@ fn int_type_of_word(s: &str) -> Option<IntType> {
     }
 }
 
-#[deriving(Copy, PartialEq, Show, Encodable, Decodable)]
+#[deriving(PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
 pub enum ReprAttr {
     ReprAny,
     ReprInt(Span, IntType),
@@ -482,7 +482,7 @@ impl ReprAttr {
     }
 }
 
-#[deriving(Copy, Eq, Hash, PartialEq, Show, Encodable, Decodable)]
+#[deriving(Eq, Hash, PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
 pub enum IntType {
     SignedInt(ast::IntTy),
     UnsignedInt(ast::UintTy)
diff --git a/src/libsyntax/codemap.rs b/src/libsyntax/codemap.rs
index 060e1d3f995..6b9af29c604 100644
--- a/src/libsyntax/codemap.rs
+++ b/src/libsyntax/codemap.rs
@@ -92,7 +92,7 @@ pub struct Span {
 
 pub const DUMMY_SP: Span = Span { lo: BytePos(0), hi: BytePos(0), expn_id: NO_EXPANSION };
 
-#[deriving(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
+#[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub struct Spanned<T> {
     pub node: T,
     pub span: Span,
@@ -218,7 +218,7 @@ pub struct ExpnInfo {
     pub callee: NameAndSpan
 }
 
-#[deriving(Copy, PartialEq, Eq, Clone, Show, Hash, Encodable, Decodable)]
+#[deriving(PartialEq, Eq, Clone, Show, Hash, RustcEncodable, RustcDecodable, Copy)]
 pub struct ExpnId(u32);
 
 pub const NO_EXPANSION: ExpnId = ExpnId(-1);
diff --git a/src/libsyntax/ext/deriving/decodable.rs b/src/libsyntax/ext/deriving/decodable.rs
index a4c70ebbc8e..57dfbc0c6e8 100644
--- a/src/libsyntax/ext/deriving/decodable.rs
+++ b/src/libsyntax/ext/deriving/decodable.rs
@@ -21,6 +21,16 @@ use parse::token::InternedString;
 use parse::token;
 use ptr::P;
 
+pub fn expand_deriving_rustc_decodable<F>(cx: &mut ExtCtxt,
+                                          span: Span,
+                                          mitem: &MetaItem,
+                                          item: &Item,
+                                          push: F) where
+    F: FnOnce(P<Item>),
+{
+    expand_deriving_decodable_imp(cx, span, mitem, item, push, "rustc_serialize")
+}
+
 pub fn expand_deriving_decodable<F>(cx: &mut ExtCtxt,
                                     span: Span,
                                     mitem: &MetaItem,
@@ -28,17 +38,28 @@ pub fn expand_deriving_decodable<F>(cx: &mut ExtCtxt,
                                     push: F) where
     F: FnOnce(P<Item>),
 {
+    expand_deriving_decodable_imp(cx, span, mitem, item, push, "serialize")
+}
+
+fn expand_deriving_decodable_imp<F>(cx: &mut ExtCtxt,
+                                    span: Span,
+                                    mitem: &MetaItem,
+                                    item: &Item,
+                                    push: F,
+                                    krate: &'static str) where
+    F: FnOnce(P<Item>),
+{
     let trait_def = TraitDef {
         span: span,
         attributes: Vec::new(),
-        path: Path::new_(vec!("serialize", "Decodable"), None,
+        path: Path::new_(vec!(krate, "Decodable"), None,
                          vec!(box Literal(Path::new_local("__D")),
                               box Literal(Path::new_local("__E"))), true),
         additional_bounds: Vec::new(),
         generics: LifetimeBounds {
             lifetimes: Vec::new(),
             bounds: vec!(("__D", None, vec!(Path::new_(
-                            vec!("serialize", "Decoder"), None,
+                            vec!(krate, "Decoder"), None,
                             vec!(box Literal(Path::new_local("__E"))), true))),
                          ("__E", None, vec!()))
         },
@@ -54,7 +75,7 @@ pub fn expand_deriving_decodable<F>(cx: &mut ExtCtxt,
                                                box Literal(Path::new_local("__E"))), true)),
                 attributes: Vec::new(),
                 combine_substructure: combine_substructure(|a, b, c| {
-                    decodable_substructure(a, b, c)
+                    decodable_substructure(a, b, c, krate)
                 }),
             })
     };
@@ -63,9 +84,10 @@ pub fn expand_deriving_decodable<F>(cx: &mut ExtCtxt,
 }
 
 fn decodable_substructure(cx: &mut ExtCtxt, trait_span: Span,
-                          substr: &Substructure) -> P<Expr> {
+                          substr: &Substructure,
+                          krate: &str) -> P<Expr> {
     let decoder = substr.nonself_args[0].clone();
-    let recurse = vec!(cx.ident_of("serialize"),
+    let recurse = vec!(cx.ident_of(krate),
                     cx.ident_of("Decodable"),
                     cx.ident_of("decode"));
     // throw an underscore in front to suppress unused variable warnings
diff --git a/src/libsyntax/ext/deriving/encodable.rs b/src/libsyntax/ext/deriving/encodable.rs
index aac515ed81a..8bd3df6232c 100644
--- a/src/libsyntax/ext/deriving/encodable.rs
+++ b/src/libsyntax/ext/deriving/encodable.rs
@@ -97,6 +97,16 @@ use ext::deriving::generic::ty::*;
 use parse::token;
 use ptr::P;
 
+pub fn expand_deriving_rustc_encodable<F>(cx: &mut ExtCtxt,
+                                          span: Span,
+                                          mitem: &MetaItem,
+                                          item: &Item,
+                                          push: F) where
+    F: FnOnce(P<Item>),
+{
+    expand_deriving_encodable_imp(cx, span, mitem, item, push, "rustc_serialize")
+}
+
 pub fn expand_deriving_encodable<F>(cx: &mut ExtCtxt,
                                     span: Span,
                                     mitem: &MetaItem,
@@ -104,17 +114,28 @@ pub fn expand_deriving_encodable<F>(cx: &mut ExtCtxt,
                                     push: F) where
     F: FnOnce(P<Item>),
 {
+    expand_deriving_encodable_imp(cx, span, mitem, item, push, "serialize")
+}
+
+fn expand_deriving_encodable_imp<F>(cx: &mut ExtCtxt,
+                                    span: Span,
+                                    mitem: &MetaItem,
+                                    item: &Item,
+                                    push: F,
+                                    krate: &'static str) where
+    F: FnOnce(P<Item>),
+{
     let trait_def = TraitDef {
         span: span,
         attributes: Vec::new(),
-        path: Path::new_(vec!("serialize", "Encodable"), None,
+        path: Path::new_(vec!(krate, "Encodable"), None,
                          vec!(box Literal(Path::new_local("__S")),
                               box Literal(Path::new_local("__E"))), true),
         additional_bounds: Vec::new(),
         generics: LifetimeBounds {
             lifetimes: Vec::new(),
             bounds: vec!(("__S", None, vec!(Path::new_(
-                            vec!("serialize", "Encoder"), None,
+                            vec!(krate, "Encoder"), None,
                             vec!(box Literal(Path::new_local("__E"))), true))),
                          ("__E", None, vec!()))
         },
diff --git a/src/libsyntax/ext/deriving/mod.rs b/src/libsyntax/ext/deriving/mod.rs
index 4a9076b07b5..edf29e670eb 100644
--- a/src/libsyntax/ext/deriving/mod.rs
+++ b/src/libsyntax/ext/deriving/mod.rs
@@ -71,24 +71,22 @@ pub fn expand_meta_deriving(cx: &mut ExtCtxt,
                             "Hash" => expand!(hash::expand_deriving_hash),
 
                             "RustcEncodable" => {
-                                expand!(encodable::expand_deriving_encodable)
+                                expand!(encodable::expand_deriving_rustc_encodable)
                             }
                             "RustcDecodable" => {
-                                expand!(decodable::expand_deriving_decodable)
+                                expand!(decodable::expand_deriving_rustc_decodable)
                             }
                             "Encodable" => {
-                                // NOTE: uncomment after a stage0 snap
-                                // cx.span_warn(titem.span,
-                                //              "deriving(Encodable) is deprecated \
-                                //               in favor of deriving(RustcEncodable)");
+                                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)");
+                                cx.span_warn(titem.span,
+                                             "deriving(Decodable) is deprecated \
+                                              in favor of deriving(RustcDecodable)");
 
                                 expand!(decodable::expand_deriving_decodable)
                             }
diff --git a/src/libsyntax/ext/mtwt.rs b/src/libsyntax/ext/mtwt.rs
index f0392912878..6a296333fdb 100644
--- a/src/libsyntax/ext/mtwt.rs
+++ b/src/libsyntax/ext/mtwt.rs
@@ -39,7 +39,7 @@ pub struct SCTable {
     rename_memo: RefCell<HashMap<(SyntaxContext,Ident,Name),SyntaxContext>>,
 }
 
-#[deriving(Copy, PartialEq, Encodable, Decodable, Hash, Show)]
+#[deriving(PartialEq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
 pub enum SyntaxContext_ {
     EmptyCtxt,
     Mark (Mrk,SyntaxContext),
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 5f62c74ef07..d5093c5055c 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -34,6 +34,8 @@ extern crate serialize;
 extern crate term;
 extern crate libc;
 
+extern crate "serialize" as rustc_serialize; // used by deriving
+
 pub mod util {
     pub mod interner;
     #[cfg(test)]
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 9e61eaae352..f575d3d6c67 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -28,7 +28,7 @@ use std::path::BytesContainer;
 use std::rc::Rc;
 
 #[allow(non_camel_case_types)]
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
 pub enum BinOpToken {
     Plus,
     Minus,
@@ -43,7 +43,7 @@ pub enum BinOpToken {
 }
 
 /// A delimeter token
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
 pub enum DelimToken {
     /// A round parenthesis: `(` or `)`
     Paren,
@@ -53,14 +53,14 @@ pub enum DelimToken {
     Brace,
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
 pub enum IdentStyle {
     /// `::` follows the identifier with no whitespace in-between.
     ModName,
     Plain,
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
 pub enum Lit {
     Byte(ast::Name),
     Char(ast::Name),
@@ -86,7 +86,7 @@ impl Lit {
 }
 
 #[allow(non_camel_case_types)]
-#[deriving(Clone, Encodable, Decodable, PartialEq, Eq, Hash, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show)]
 pub enum Token {
     /* Expression-operator symbols. */
     Eq,
@@ -334,7 +334,7 @@ impl Token {
     }
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq, Eq, Hash)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash)]
 /// For interpolation during macro expansion.
 pub enum Nonterminal {
     NtItem(P<ast::Item>),
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index 1870f162ece..4b73fe04c85 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -37,6 +37,7 @@
 extern crate getopts;
 extern crate regex;
 extern crate serialize;
+extern crate "serialize" as rustc_serialize;
 extern crate term;
 
 pub use self::TestFn::*;
@@ -214,7 +215,7 @@ pub struct TestDescAndFn {
     pub testfn: TestFn,
 }
 
-#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Show)]
+#[deriving(Clone, RustcEncodable, RustcDecodable, PartialEq, Show, Copy)]
 pub struct Metric {
     value: f64,
     noise: f64
diff --git a/src/libtime/lib.rs b/src/libtime/lib.rs
index dfa9b924274..e58a0229d69 100644
--- a/src/libtime/lib.rs
+++ b/src/libtime/lib.rs
@@ -24,7 +24,9 @@
 
 #[cfg(test)] #[phase(plugin, link)] extern crate log;
 
+#[cfg(stage0)]
 extern crate serialize;
+extern crate "serialize" as rustc_serialize;
 extern crate libc;
 
 pub use self::ParseError::*;
@@ -76,7 +78,8 @@ mod imp {
 }
 
 /// A record specifying a time value in seconds and nanoseconds.
-#[deriving(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Encodable, Decodable, Show)]
+#[deriving(Clone, PartialEq, Eq, PartialOrd, Ord, RustcEncodable,
+           RustcDecodable, Show, Copy)]
 pub struct Timespec {
     pub sec: i64,
     pub nsec: i32,