gnu: Add rust-num-enum-derive-0.4.

* gnu/packages/crates-io.scm (rust-num-enum-derive-0.4): New variable.

gnu/packages/crates-io.scm

@@ -18054,6 +18054,32 @@ (define-public rust-num-derive-0.2
     (description "Numeric syntax extensions in Rust.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-num-enum-derive-0.4
+  (package
+    (name "rust-num-enum-derive")
+    (version "0.4.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "num_enum_derive" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "17fvb7xpxq2dsqp5nsz98w1qhkk3gnc56xis53009vnzvlys79gz"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:tests? #f                      ;FIXME: some doc tests fail
+       #:cargo-inputs
+       (("rust-proc-macro-crate" ,rust-proc-macro-crate-0.1)
+        ("rust-proc-macro2" ,rust-proc-macro2-1)
+        ("rust-quote" ,rust-quote-1)
+        ("rust-syn" ,rust-syn-1))))
+    (home-page "https://github.com/illicitonion/num_enum")
+    (synopsis "Procedural macros to ease operation between primitives and enums")
+    (description
+     "This package provides procedural macros to make inter-operation between
+primitives and enums easier.")
+    (license license:bsd-3)))
+
 (define-public rust-num-integer-0.1
   (package
     (name "rust-num-integer")