gnu: Add rust-fallible-iterator-0.3.

* gnu/packages/crates-io.scm (rust-fallible-iterator-0.3): New variable.
(rust-fallible-iterator-0.2): Inherit from rust-fallible-iterator-0.3.

Change-Id: Iddafe2cfbe14f0202837c2103cb28c9b5a9b0d7c

gnu/packages/crates-io.scm

@@ -22774,8 +22774,29 @@ fallible format macro.")
     (description "Derives for the failure crate.")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-fallible-iterator-0.3
+  (package
+    (name "rust-fallible-iterator")
+    (version "0.3.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "fallible-iterator" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0ja6l56yka5vn4y4pk6hn88z0bpny7a8k1919aqjzp0j1yhy9k1a"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/sfackler/rust-fallible-iterator")
+    (synopsis "Fallible iterator traits")
+    (description "If the @code{std} or @code{alloc} features are enabled, this
+crate provides implementations for @code{Box}, @code{Vec}, @code{BTreeMap}, and
+@code{BTreeSet}.  If the @code{std} feature is enabled, this crate additionally
+provides implementations for @code{HashMap} and @code{HashSet}.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-fallible-iterator-0.2
   (package
+    (inherit rust-fallible-iterator-0.3)
     (name "rust-fallible-iterator")
     (version "0.2.0")
     (source
@@ -22784,17 +22805,7 @@ fallible format macro.")
         (uri (crate-uri "fallible-iterator" version))
         (file-name (string-append name "-" version ".tar.gz"))
         (sha256
-         (base32
-          "1xq759lsr8gqss7hva42azn3whgrbrs2sd9xpn92c5ickxm1fhs4"))))
-    (build-system cargo-build-system)
-    (home-page "https://github.com/sfackler/rust-fallible-iterator")
-    (synopsis "Fallible iterator traits")
-    (description "If the @code{std} or @code{alloc} features are enabled, this
-crate provides implementations for @code{Box}, @code{Vec}, @code{BTreeMap}, and
-@code{BTreeSet}.  If the @code{std} feature is enabled, this crate additionally
-provides implementations for @code{HashMap} and @code{HashSet}.")
-    (license (list license:asl2.0
-                   license:expat))))
+         (base32 "1xq759lsr8gqss7hva42azn3whgrbrs2sd9xpn92c5ickxm1fhs4"))))))
 
 (define-public rust-fallible-streaming-iterator-0.1
   (package