gnu: Add rust-objc2-metal-0.2.

* gnu/packages/crates-apple.scm (rust-objc2-metal-0.2): New variable.

Change-Id: I32b8d1f2b68c77dd11d0896d98f7c7e28c5b0ef4

gnu/packages/crates-apple.scm

@@ -1476,6 +1476,30 @@ the Cocoa Foundation framework.")
      "This package provides bindings to the @code{LinkPresentation} framework.")
     (license license:expat)))
 
+(define-public rust-objc2-metal-0.2
+  (package
+    (name "rust-objc2-metal")
+    (version "0.2.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "objc2-metal" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1mmdga66qpxrcfq3gxxhysfx3zg1hpx4z886liv3j0pnfq9bl36x"))))
+    (build-system cargo-build-system)
+    (arguments
+     ;; Must specify the desired runtime using Cargo features on non-Apple platforms
+     `(#:skip-build? #t
+       #:cargo-inputs (("rust-bitflags" ,rust-bitflags-2)
+                       ("rust-block2" ,rust-block2-0.5)
+                       ("rust-objc2" ,rust-objc2-0.5)
+                       ("rust-objc2-foundation" ,rust-objc2-foundation-0.2))))
+    (home-page "https://github.com/madsmtm/objc2")
+    (synopsis "Bindings to the Metal framework")
+    (description "This package provides bindings to the Metal framework.")
+    (license license:expat)))
+
 (define-public rust-objc2-proc-macros-0.1
   (package
     (name "rust-objc2-proc-macros")