[PATCH 41/86] gnu: Add rust-fnv.

[ng0]

* gnu/packages/rust.scm (rust-fnv): New variable.
---
 gnu/packages/rust.scm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
index 047f6d21e..6f02eb7ca 100644
--- a/gnu/packages/rust.scm
+++ b/gnu/packages/rust.scm
@@ -1170,3 +1170,29 @@ clippy's procedural macro checks.")
 Unicode strings, including Canonical and Compatible Decomposition and
 Recomposition, as described in Unicode Standard Annex #15.")
     (license (list license:expat license:asl2.0))))
+
+(define-public rust-fnv
+  (package
+    (name "rust-fnv")
+    (version "1.0.5")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "fnv" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0i73zsc7q1hapamwfv793k3xhan11jb9ylkgypx88a0y5y289i3c"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/servo/rust-fnv";)
+    (synopsis "Implementation of the Fowler–Noll–Vo hash function")
+    (description
+     "The FNV hash function is a custom Hasher implementation that is
+more efficient for smaller hash keys.
+
+The Rust FAQ states that while the default Hasher implementation,
+SipHash, is good in many cases, it is notably slower than other
+algorithms with short keys, such as when you have a map of integers to
+other values.  In cases like these, FNV is demonstrably faster.")
+    (license (list license:expat license:asl2.0))))
-- 
2.11.0