dannym pushed a commit to branch wip-desktop
in repository guix.

commit b29eb4f8b711cc3bf4e827d9dc20ee6f8ef7ec32
Author: Raghav Gururajan <[email protected]>
AuthorDate: Wed Jul 8 14:44:49 2020 -0400

    gnu: Add [email protected].
    
    * gnu/packages/crates-io.scm (rust-downcast-rs-1.2): New variable.
    
    Signed-off-by: Danny Milosavljevic <[email protected]>
---
 gnu/packages/crates-io.scm | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index c3a412a..c8c447a 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -6152,6 +6152,27 @@ from macros.")
 parameters, associated types, and type constraints.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-downcast-rs-1.2
+  (package
+    (name "rust-downcast-rs")
+    (version "1.2.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "downcast-rs" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0l36kgxqd5djhqwf5abxjmgasdw8n0qsjvw3jdvhi91nj393ba4y"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/marcianx/downcast-rs";)
+    (synopsis "Trait object downcasting support using only safe Rust")
+    (description
+     "Trait object downcasting support using only safe Rust.  It supports type
+parameters, associated types, and type constraints.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-dogged-0.2
   (package
     (name "rust-dogged")

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