gnu: Add rust-safemem.

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

gnu/packages/crates-io.scm

@@ -1118,6 +1118,26 @@ rust-lang/rust integration.")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-safemem
+  (package
+    (name "rust-safemem")
+    (version "0.3.2")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "safemem" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "1l1ljkm4lpyryrv2ndaxi1f7z1f3v9bwy1rzl9f9mbhx04iq9c6j"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/abonander/safemem")
+    (synopsis "Safe wrappers for memory-accessing functions")
+    (description
+     "Safe wrappers for memory-accessing functions, like @code{std::ptr::copy()}.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-scoped-tls
   (package
     (name "rust-scoped-tls")