Rework `rustc_serialize`

- Move the type parameter from `encode` and `decode` methods to
  the trait.
- Remove `UseSpecialized(En|De)codable` traits.
- Remove blanket impls for references.
- Add `RefDecodable` trait to allow deserializing to arena-allocated
  references safely.
- Remove ability to (de)serialize HIR.
- Create proc-macros `(Ty)?(En|De)codable` to help implement these new
  traits.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustc_data_structures/thin_vec.rs b/src/librustc_data_structures/thin_vec.rs
index 43002178eb9..4d673fd5cf9 100644
--- a/src/librustc_data_structures/thin_vec.rs
+++ b/src/librustc_data_structures/thin_vec.rs
@@ -3,7 +3,7 @@ use crate::stable_hasher::{HashStable, StableHasher};
 /// A vector type optimized for cases where this size is usually 0 (cf. `SmallVector`).
 /// The `Option<Box<..>>` wrapping allows us to represent a zero sized vector with `None`,
 /// which uses only a single (null) pointer.
-#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
+#[derive(Clone, Encodable, Decodable, Debug)]
 pub struct ThinVec<T>(Option<Box<Vec<T>>>);
 
 impl<T> ThinVec<T> {