12/43: gnu: Add rust-futures.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit 1956ba239ccec1e9889e346a9cf7e1b5f50f5745
Author: Efraim Flashner <address@hidden>
Date:   Sun Aug 4 13:48:58 2019 +0300

    gnu: Add rust-futures.
    
    * gnu/packages/crates-io.scm (rust-futures): 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 afd7cb5..dedc0b8 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -233,6 +233,26 @@ implementation that is more efficient for smaller hash 
keys.")
 process and much more.")
     (license license:expat)))
 
+(define-public rust-futures
+  (package
+    (name "rust-futures")
+    (version "0.1.28")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "futures" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "0saq8ffjw1pwf1pzhw3kq1z7dfq6wpd8x93dnni6vbkc799kkp25"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/rust-lang-nursery/futures-rs";)
+    (synopsis "Implementation of zero-cost futures in Rust")
+    (description "An implementation of @code{futures} and @code{streams}
+featuring zero allocations, composability, and iterator-like interfaces.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-proc-macro2
   (package
     (name "rust-proc-macro2")