gnu: Add rust-countme-2.

* gnu/packages/crates-io.scm (rust-countme-2): New variable.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu/packages/crates-io.scm

@@ -9538,6 +9538,32 @@ (define-public rust-core-text-13
         ("rust-foreign-types" ,rust-foreign-types-0.3)
         ("rust-libc" ,rust-libc-0.2))))))
 
+(define-public rust-countme-2
+  (package
+    (name "rust-countme")
+    (version "2.0.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "countme" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0n6bzg2g6gsmgabyzbcfkyb9y9mzxsvavng85d04wkdsvhmq52rj"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-dashmap" ,rust-dashmap-4)
+        ("rust-once-cell" ,rust-once-cell-1)
+        ("rust-rustc-hash" ,rust-rustc-hash-1))))
+    (home-page "https://github.com/matklad/countme")
+    (synopsis
+     "Counts the number of live instances of types")
+    (description
+     "This package provides a counts the number of live instances of types.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-cpp-demangle-0.3
   (package
     (name "rust-cpp-demangle")