gnu: Add rust-rustc-serialize.

* gnu/packages/crates-io.scm (rust-rustc-serialize): New variable.

gnu/packages/crates-io.scm

@@ -1728,6 +1728,32 @@ system calls.")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-rustc-serialize
+  (package
+    (name "rust-rustc-serialize")
+    (version "0.3.24")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "rustc-serialize" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "1nkg3vasg7nk80ffkazizgiyv3hb1l9g3d8h17cajbkx538jiwfw"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-development-inputs
+       (("rust-rand" ,rust-rand-0.3))))
+    (home-page "https://github.com/rust-lang-deprecated/rustc-serialize")
+    (synopsis "Generic serialization/deserialization support")
+    (description
+     "This package provides generic serialization/deserialization support
+corresponding to the @code{derive(RustcEncodable, RustcDecodable)} mode in the
+compiler.  Also includes support for hex, base64, and json encoding and
+decoding.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-rustc-std-workspace-core
   (package
     (name "rust-rustc-std-workspace-core")