gnu: emacs-sly: Update to 1.0.42.

* gnu/packages/emacs-xyz.scm (emacs-sly): Update to 1.0.42.

gnu/packages/emacs-xyz.scm

@@ -9482,25 +9482,21 @@ are pretty much the same (and SLIME served as the principle inspiration for
 CIDER).")
     (license license:gpl3+)))
 
-;; There hasn't been a tag or release since 2016, so we take the latest
-;; commit.
 (define-public emacs-sly
-  (let ((commit "68561f1b7b66fa0240766ece836bb04da31ea17d")
   ;; Update together with sbcl-slynk.
-        (revision "7"))
   (package
     (name "emacs-sly")
-      (version (git-version "1.0.0" revision commit))
+    (version "1.0.42")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/joaotavora/sly")
-               (commit commit)))
+             (commit version)))
        (file-name (git-file-name name version))
        (sha256
         (base32
-           "1xwx537dhgclngi6b0faf320i8pnac9309wvmk6z2g6dm3v652ds"))))
+         "10l867c4hgcpiajcfkz9g9vabp7y4bcgy51la6n9pqxrlg1fs455"))))
     (build-system emacs-build-system)
     (native-inputs
      `(("texinfo" ,texinfo)))
@@ -9546,20 +9542,22 @@ CIDER).")
 contains the following improvements over it:
 
 @enumerate
-@item Completely redesigned REPL based on Emacs's own full-featured
-  @code{comint.el}.
-@item Live code annotations via a new @code{sly-stickers} contrib.
-@item Consistent interactive button interface.  Everything can be copied to
-  the REPL.
-@item Multiple inspectors with independent history.
+@item A full-featured REPL based on Emacs's @code{comint.el}.  Everything
+can be copied to the REPL;
+@item Stickers, or live code annotations that record values as code traverses them.
+@item Flex-style completion out-of-the-box, using Emacs's completion API.
+Company, Helm, and other supported natively, no plugin required;
+@item An interactive Trace Dialog;
+@item Multiple inspectors and multiple REPLs, with independent history.
 @item Regexp-capable @code{M-x sly-apropos}.
-@item Contribs are first class SLY citizens and enabled by default.
-@item Use ASDF to loads contribs on demand.
+@item Cleanly ASDF-loaded by default, including contribs, enabled out-of-the-box;
+@item \"Presentations\" replaced by interactive backreferences, which
+highlight the object and remain stable throughout the REPL session;
 @end enumerate
 
 SLY tracks SLIME's bugfixes and all its familiar features (debugger, inspector,
-xref, etc...) are still available, but with better integration.")
-      (license license:gpl3+))))
+xref, etc.) are still available, but with better integration.")
+    (license license:gpl3+)))
 
 (define-public emacs-sly-quicklisp
   (let ((commit "01ebe3976a244309f2e277c09206831135a0b66c")