gnu: Add rust-reduce-0.1.

* gnu/packages/crates-io.scm (rust-reduce-0.1): New variable.

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

gnu/packages/crates-io.scm

@@ -37312,6 +37312,27 @@ (define-public rust-redox-users-0.3
 functionality.")
     (license license:expat)))
 
+(define-public rust-reduce-0.1
+  (package
+    (name "rust-reduce")
+    (version "0.1.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "reduce" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1mrmicr43hx3s9556zbzg0lys4nmsw0vwznd52imxhcanr3xrlhn"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/dtolnay/reduce")
+    (synopsis "Fold an iterator without an initial value")
+    (description
+     "This package provides a way to fold an iterator without a separate
+initial value.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-ref-cast-1
   (package
     (name "rust-ref-cast")