gnu: Add rust-nom-2.

* gnu/packages/crates-io.scm (rust-nom-2): New variable.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/crates-io.scm

@@ -17274,6 +17274,27 @@ (define-public rust-nom-3
         ("rust-memchr" ,rust-memchr-1.0)
         ("rust-regex" ,rust-regex-0.2))))))
 
+(define-public rust-nom-2
+  (package
+    (inherit rust-nom-4.2)
+    (name "rust-nom")
+    (version "2.2.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "nom" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1zv6ig7nw532rl4p35jsahglfhyyznjkblwa6si6c0plxhlsflfg"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-lazy-static" ,rust-lazy-static-0.2)
+        ("rust-regex" ,rust-regex-0.2))
+       #:tests? #f))))
+
 (define-public rust-nom-1.2
   (package
     (inherit rust-nom-4.2)