02/53: gnu: Add rust-lazy-static.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit a353643035997e5392f43715b2878caecf849e6d
Author: Efraim Flashner <address@hidden>
Date:   Wed Aug 28 14:51:42 2019 +0300

    gnu: Add rust-lazy-static.
    
    * gnu/packages/crates-io.scm (rust-lazy-static): New variable.
---
 gnu/packages/crates-io.scm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index d017ee6..2034c21 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -335,6 +335,32 @@ friction with idiomatic Rust structs to ease 
interopability.")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-lazy-static
+  (package
+    (name "rust-lazy-static")
+    (version "1.3.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "lazy_static" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "052ac27w189hrf1j3hz7sga46rp84zl2hqnzyihxv78mgzr2jmxw"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs (("rust-spin" ,rust-spin))))
+    (home-page  "https://github.com/rust-lang-nursery/lazy-static.rs";)
+    (synopsis "Macro for declaring lazily evaluated statics in Rust")
+    (description
+     "This package provides a macro for declaring lazily evaluated statics in
+Rust.  Using this macro, it is possible to have @code{static}s that require 
code
+to be executed at runtime in order to be initialized.  This includes anything
+requiring heap allocations, like vectors or hash maps, as well as anything that
+requires non-const function calls to be computed.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-libc
   (package
     (name "rust-libc")