[bug#49451] [PATCH 04/20] gnu: Add rust-downcast

[southerntofu]

---
 gnu/packages/crates-io.scm | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 2ac7bc0c2e..d3641af193 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -13721,6 +13721,29 @@ from macros.")
         ("rust-rustc-serialize" ,rust-rustc-serialize-0.3)
         ("rust-strsim" ,rust-strsim-0.5))))))
 
+(define-public rust-downcast-0.10
+  (package
+    (name "rust-downcast")
+    (version "0.10.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "downcast" version))
+        (file-name
+          (string-append name "-" version ".tar.gz"))
+        (sha256
+          (base32
+            "07bh0l95gwrzak6rj29v8kkm577d8vivxsxhqgscf64b4bq59d2b"))))
+    (build-system cargo-build-system)
+    (arguments `(#:skip-build? #t))
+    (home-page
+      "https://github.com/fkoep/downcast-rs";)
+    (synopsis
+      "Trait for downcasting trait objects back to their original types")
+    (description
+      "Trait for downcasting trait objects back to their original types")
+    (license license:expat)))
+
 (define-public rust-downcast-rs-1
   (package
     (name "rust-downcast-rs")
-- 
2.30.2