05/45: gnu: Add rust-cfg-if-0.1.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit df2252674025d9699f2a6ebd93f6e249ee8a3d92
Author: Efraim Flashner <address@hidden>
Date:   Wed Oct 23 09:44:40 2019 +0300

    gnu: Add rust-cfg-if-0.1.
    
    * gnu/packages/rust-cbindgen.scm (rust-cfg-if-0.1): New hidden variable.
---
 gnu/packages/rust-cbindgen.scm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gnu/packages/rust-cbindgen.scm b/gnu/packages/rust-cbindgen.scm
index 6cc5882..0a5e50e 100644
--- a/gnu/packages/rust-cbindgen.scm
+++ b/gnu/packages/rust-cbindgen.scm
@@ -106,3 +106,25 @@ behave like a set of bitflags.")
     (properties '((hidden? . #t)))
     (license (list license:asl2.0
                    license:expat))))
+
+(define rust-cfg-if-0.1
+  (package
+    (name "rust-cfg-if")
+    (version "0.1.10")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "cfg-if" version))
+        (file-name (string-append name "-" version ".crate"))
+        (sha256
+         (base32
+          "08h80ihs74jcyp24cd75wwabygbbdgl05k6p5dmq8akbr78vv1a7"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/alexcrichton/cfg-if";)
+    (synopsis "Define an item depending on parameters")
+    (description "This package provides a macro to ergonomically define an item
+depending on a large number of #[cfg] parameters.  Structured like an
+@code{if-else} chain, the first matching branch is the item that gets 
emitted.")
+    (properties '((hidden? . #t)))
+    (license (list license:asl2.0
+                   license:expat))))