gnu: Add rust-nom-4.2.

* gnu/packages/crates-io.scm (rust-nom-4.2): New variable.

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

gnu/packages/crates-io.scm

@@ -4736,6 +4736,40 @@ implementation (which is unstable / requires nightly).")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-nom-4.2
+  (package
+    (name "rust-nom")
+    (version "4.2.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "nom" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1mkvby8b4m61p4g1px0pwr58yfkphyp1jcfbp4qfp7l6iqdaklia"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-lazy-static" ,rust-lazy-static-1.3)
+        ("rust-lexical-core" ,rust-lexical-core-0.4)
+        ("rust-memchr" ,rust-memchr-2.2)
+        ("rust-regex" ,rust-regex-1.1))
+       #:cargo-development-inputs
+       (("rust-criterion" ,rust-criterion-0.2)
+        ("rust-doc-comment" ,rust-doc-comment-0.3)
+        ("rust-jemallocator" ,rust-jemallocator-0.3)
+        ("rust-version-check" ,rust-version-check-0.9))))
+    (home-page "https://github.com/Geal/nom")
+    (synopsis
+     "Byte-oriented, zero-copy, parser combinators library")
+    (description
+     "This package provides a byte-oriented, zero-copy, parser
+combinators library.")
+    (license license:expat)))
+
 (define-public rust-num-complex-0.2
   (package
     (name "rust-num-complex")