gnu: Add rust-atomic-0.6.

* gnu/packages/crates-io.scm (rust-atomic-0.6): New variable.
(rust-atomic-0.5): Inherit from rust-atomic-0.6.

Change-Id: I20e5f45ed4de079f294cec2d013e866609a33ace
Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/crates-io.scm

@@ -4924,8 +4924,33 @@ methods.")
     (description "This package provides a safe abstraction around AtomicPtr.")
     (license license:asl2.0)))
 
+(define-public rust-atomic-0.6
+  (package
+    (name "rust-atomic")
+    (version "0.6.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "atomic" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "15193mfhmrq3p6vi1a10hw3n6kvzf5h32zikhby3mdj0ww1q10cd"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs (("rust-bytemuck" ,rust-bytemuck-1))
+       #:cargo-development-inputs (("rust-bytemuck" ,rust-bytemuck-1))))
+    (home-page "https://github.com/Amanieu/atomic-rs")
+    (synopsis "Generic @code{Atomic<T>} wrapper type")
+    (description
+     "This package provides a generic @code{Atomic<T>} type for all
+@code{T: Copy} types, unlike the standard library which only provides a few
+fixed atomic types.")
+    ;; The user can choose either license.
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-atomic-0.5
   (package
+    (inherit rust-atomic-0.6)
     (name "rust-atomic")
     (version "0.5.1")
     (source (origin
@@ -4935,17 +4960,8 @@ methods.")
               (sha256
                (base32
                 "0k135q1qfmxxyzrlhr47r0j38r5fnd4163rgl552qxyagrk853dq"))))
-    (build-system cargo-build-system)
     (arguments
-     `(#:cargo-inputs (("rust-autocfg" ,rust-autocfg-1))))
+     `(#:cargo-inputs (("rust-autocfg" ,rust-autocfg-1))))))
-    (home-page "https://github.com/Amanieu/atomic-rs")
-    (synopsis "Generic @code{Atomic<T>} wrapper type")
-    (description
-     "This package provides a generic @code{Atomic<T>} type for all
-@code{T: Copy} types, unlike the standard library which only provides a few
-fixed atomic types.")
-    ;; The user can choose either license.
-    (license (list license:asl2.0 license:expat))))
 
 (define-public rust-atomic-polyfill-1
   (package