32/43: gnu: Add rust-spin.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit a60f26b24d3ca400488d45faca0444e0db450f32
Author: Efraim Flashner <address@hidden>
Date:   Sun Aug 4 14:04:34 2019 +0300

    gnu: Add rust-spin.
    
    * gnu/packages/crates-io.scm (rust-spin): New variable.
---
 gnu/packages/crates-io.scm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index a6019e5..1a9df7f 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -680,6 +680,26 @@ words, like Python's shlex.")
 data type.")
     (license license:expat)))
 
+(define-public rust-spin
+  (package
+    (name "rust-spin")
+    (version "0.5.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "spin" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "0m9clchsj0rf13bggsgvbv9haiy0f6rhvnvkpvkk8720a5pkydj4"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/mvdnes/spin-rs.git";)
+    (synopsis "Synchronization primitives based on spinning")
+    (description "This crate provides synchronization primitives based on
+spinning.  They may contain data, are usable without @code{std},and static
+initializers are available.")
+    (license license:expat)))
+
 (define-public rust-unicode-xid
   (package
     (name "rust-unicode-xid")