gnu: Add rust-bytecount-0.5.

* gnu/packages/crates-io.scm (rust-bytecount-0.5): New variable.

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

gnu/packages/crates-io.scm

@@ -766,6 +766,35 @@ UTF-8.")
     (description "Bytes related utility functions.")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-bytecount-0.5
+  (package
+    (name "rust-bytecount")
+    (version "0.5.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "bytecount" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0z6a280kiy4kg5v3qw97pbyvwycr17fsm41804i8zpq7nmads3xy"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-packed-simd" ,rust-packed-simd-0.3))
+       #:cargo-development-inputs
+       (("rust-criterion" ,rust-criterion-0.2)
+        ("rust-quickcheck" ,rust-quickcheck-0.8)
+        ("rust-rand" ,rust-rand-0.4))))
+    (home-page "https://github.com/llogiq/bytecount")
+    (synopsis "Count occurrences of a given byte")
+    (description
+     "Count occurrences of a given byte, or the number of UTF-8 code points,
+in a byte slice, fast.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-byteorder-1.3
   (package
     (name "rust-byteorder")