[bug#56298] [PATCH 6/7] gnu: Add rust-loom-0.5.

[peter@polidoro.io]

From: Peter Polidoro <peter@polidoro.io>

* gnu/packages/crates-io.scm (rust-loom-0.5): New variable.
---
 gnu/packages/crates-io.scm | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 155d693430..c1a54bdecf 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -32646,6 +32646,38 @@ (define-public rust-logtest-2
     (description "This package tests and asserts log statements.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-loom-0.5
+  (package
+    (name "rust-loom")
+    (version "0.5.6")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "loom" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1x9hmiv00ir79kypcg0jdw0j0fkd3ymq6rpv6pli6q5qifrfql7z"))))
+    (build-system cargo-build-system)
+    (arguments
+     ;; FIXME: build phase fails with the error: "the
+     ;; `#[track_caller]` attribute is an experimental feature".
+     `(#:skip-build? #true
+       #:cargo-inputs
+       (("rust-cfg-if" ,rust-cfg-if-1)
+        ("rust-futures-util" ,rust-futures-util-0.3)
+        ("rust-generator" ,rust-generator-0.6)
+        ("rust-scoped-tls" ,rust-scoped-tls-1)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-serde-json" ,rust-serde-json-1))))
+    (home-page "https://github.com/tokio-rs/loom")
+    (synopsis "Permutation testing for concurrent code")
+    (description
+     "Loom is a testing tool for concurrent Rust code.  It runs a test many
+times, permuting the possible concurrent executions of that test under the C11
+memory model.  It uses state reduction techniques to avoid combinatorial
+explosion.")
+    (license license:expat)))
+
 (define-public rust-loom-0.4
   (package
     (name "rust-loom")
-- 
2.36.1