gnu: Add rust-tokio-trace-core-0.2.

* gnu/packages/crates-io.scm (rust-tokio-trace-core-0.2): New variable.

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

gnu/packages/crates-io.scm

@@ -9052,6 +9052,29 @@ pool.")
     (description "Timer facilities for Tokio.")
     (license license:expat)))
 
+(define-public rust-tokio-trace-core-0.2
+  (package
+    (name "rust-tokio-trace-core")
+    (version "0.2.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "tokio-trace-core" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "04y6c2r4ddzk02xb3hn60s9a1w92h0g8pzmxwaspqvwmsrba5j59"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-lazy-static" ,rust-lazy-static-1.3))))
+    (home-page "https://tokio.rs")
+    (synopsis "Core primitives for tokio-trace")
+    (description "Core primitives for tokio-trace.")
+    (license license:expat)))
+
 (define-public rust-tokio-udp-0.1
   (package
     (name "rust-tokio-udp")