gnu: Add rust-field-offset-0.3.

* gnu/packages/crates-io.scm (rust-field-offset-0.3): New variable.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu/packages/crates-io.scm

@@ -19642,6 +19642,30 @@ representation.")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-field-offset-0.3
+  (package
+    (name "rust-field-offset")
+    (version "0.3.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "field-offset" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "14pvxz7yr0r3mlhaf65zva3r9d0kqid01wdw7ngx7jsh2jam870y"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build?
+       #t
+       #:cargo-inputs
+       (("rust-memoffset" ,rust-memoffset-0.6)
+        ("rust-rustc-version" ,rust-rustc-version-0.3))))
+    (home-page "https://github.com/Diggsey/rust-field-offset")
+    (synopsis "Safe pointer-to-member implementation")
+    (description "This package provides safe pointer-to-member
+implementation.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-findshlibs-0.5
   (package
     (name "rust-findshlibs")