24/25: gnu: Add julia-simpletraits.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit 63a833759852ef4545f66882594bb3e6a5e52cc6
Author: Efraim Flashner <efraim@flashner.co.il>
AuthorDate: Tue Jun 8 17:50:04 2021 +0300

    gnu: Add julia-simpletraits.
    
    * gnu/packages/julia-xyz.scm (julia-simpletraits): New variable.
---
 gnu/packages/julia-xyz.scm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/gnu/packages/julia-xyz.scm b/gnu/packages/julia-xyz.scm
index 76cbc1d..6bce635 100644
--- a/gnu/packages/julia-xyz.scm
+++ b/gnu/packages/julia-xyz.scm
@@ -2448,6 +2448,31 @@ formatting an array of n things, e.g. numbers, dates, 
unitful values.  It's used
 in @code{Gadfly}, @code{Plots} and @code{Makie} to label axes and keys.")
     (license license:expat)))
 
+(define-public julia-simpletraits
+  (package
+    (name "julia-simpletraits")
+    (version "0.9.3")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/mauro3/SimpleTraits.jl";)
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32 "1aaq91klwxb0r3ckwihf7rd7jvg70757nkhp5ip4cc3lspnnip23"))))
+    (build-system julia-build-system)
+    (propagated-inputs
+     `(("julia-macrotools" ,julia-macrotools)))
+    (home-page "https://github.com/mauro3/SimpleTraits.jl";)
+    (synopsis "Simple Traits for Julia")
+    (description "This package provides a macro-based implementation of traits.
+The main idea behind traits is to group types outside the type-hierarchy and to
+make dispatch work with that grouping.  The difference to Union-types is that
+types can be added to a trait after the creation of the trait, whereas Union
+types are fixed after creation.")
+    (license license:expat)))
+
 (define-public julia-sortingalgorithms
   (package
     (name "julia-sortingalgorithms")