gnu: Add rust-rls-span-0.5.

* gnu/packages/crates-io.scm (rust-rls-span-0.5): New variable.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/crates-io.scm

@@ -19495,6 +19495,32 @@ uses finite automata and guarantees linear time matching on all inputs.")
         ;; build dependencies
         ("rust-cc" ,rust-cc-1.0))))))
 
+(define-public rust-rls-span-0.5
+  (package
+    (name "rust-rls-span")
+    (version "0.5.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "rls-span" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0d6rwya5zsyw6vmrj8d8g3fgvic0xyp1lvfhv62vswk2dzavxsgj"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-rustc-serialize" ,rust-rustc-serialize-0.3)
+        ("rust-serde" ,rust-serde-1.0)
+        ("rust-serde-derive" ,rust-serde-derive-1.0))))
+    (home-page "https://github.com/rust-lang/rls")
+    (synopsis "Types for identifying code spans/ranges")
+    (description
+     "Identify Rust code spans and ranges using these types - for use with the
+Rust Language Server.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-ron-0.4
   (package
     (name "rust-ron")