@@ -3810,6 +3810,44 @@ (define-public cl-trivial-garbage
(define-public ecl-trivial-garbage
(sbcl-package->ecl-package sbcl-trivial-garbage))
+(define-public sbcl-ucons
+ (let ((commit "d976810ef2b12a2caaf55bd0f258272e9b79f3be")
+ (revision "0"))
+ (package
+ (name "sbcl-ucons")
+ (version (git-version "0.0.0" revision commit))
+ (source
+ (origin
+ (method git-fetch)
+ (uri (git-reference
+ (url "https://github.com/marcoheisig/ucons")
+ (commit commit)))
+ (file-name (git-file-name "cl-ucons" version))
+ (sha256
+ (base32 "17aj47pdjiywnf33hl46p27za2q0pq5ar3fpqxaqskggxrfxmijl"))))
+ (build-system asdf-build-system/sbcl)
+ (inputs
+ (list sbcl-alexandria
+ sbcl-atomics
+ sbcl-bordeaux-threads
+ sbcl-named-readtables
+ sbcl-trivia))
+ (home-page "https://github.com/marcoheisig/ucons")
+ (synopsis "Unique conses for Common Lisp")
+ (description "UCONS is a Common Lisp library providing unique conses.
+Unique conses are different from regular conses in that, in addition to their
+@code{car} and @code{cdr}, they maintain a table of past users. Also, the
+@code{cdr} of each ucons is restricted to other uconses or @code{nil}.
+Uconses are meant for those situations where even reusing regular conses (to
+avoid consing) is too computationally expensive.")
+ (license license:expat))))
+
+(define-public cl-ucons
+ (sbcl-package->cl-source-package sbcl-ucons))
+
+(define-public ecl-ucons
+ (sbcl-package->ecl-package sbcl-ucons))
+
(define-public sbcl-closer-mop
(let ((commit "19c9d33f576e10715fd79cc1d4f688dab0f241d6"))
(package