gnu: Add rust-tokio-macros-0.3.

* gnu/packages/crates-io.scm (rust-tokio-macros-0.3): New variable.
(rust-tokio-macros-0.2): Inherit from above.

gnu/packages/crates-io.scm

@@ -31942,6 +31942,50 @@ futures efficiently")
     (description "This package provides Tokio's proc macros.")
     (license license:expat)))
 
+(define-public rust-tokio-macros-0.3
+  (package
+    (name "rust-tokio-macros")
+    (version "0.3.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "tokio-macros" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1dvd3gji7a0i1kgck2lwgbcbklk3qb1bsqgd2v9amj63kyjzzps6"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-proc-macro2" ,rust-proc-macro2-1)
+        ("rust-quote" ,rust-quote-1)
+        ("rust-syn" ,rust-syn-1))
+       #:cargo-development-inputs
+       (("rust-tokio" ,rust-tokio-0.3))))
+    (home-page "https://tokio.rs")
+    (synopsis "Tokio's proc macros")
+    (description "This package provides Tokio's proc macros.")
+    (license license:expat)))
+
+(define-public rust-tokio-macros-0.2
+  (package
+    (inherit rust-tokio-macros-0.3)
+    (name "rust-tokio-macros")
+    (version "0.2.5")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "tokio-macros" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1283aq0l7rnh79zzqk4r34dgimvwcymrzmg1yah9ai2nmb3arhzh"))))
+    (arguments
+     `(#:cargo-inputs
+       (("rust-proc-macro2" ,rust-proc-macro2-1)
+        ("rust-quote" ,rust-quote-1)
+        ("rust-syn" ,rust-syn-1))
+       #:cargo-development-inputs
+       (("rust-tokio" ,rust-tokio-0.2))))))
+
 (define-public rust-tokio-mock-task-0.1
   (package
     (name "rust-tokio-mock-task")