SLY: Do not append space after filename completion.

.emacs.d/lisp/init-sly.el

@@ -165,6 +165,13 @@ Good substitute for `sly-mrepl-indent-and-complete-symbol'."
 (setq sly-command-switch-to-existing-lisp 'always)
 (add-hook 'sly-mrepl-hook #'ambrevar/init-lispy)
 (add-hook 'sly-mrepl-hook #'rainbow-delimiters-mode)
+
+;; REVIEW: https://github.com/joaotavora/sly/issues/404
+(defun ambrevar/do-not-append-space-after-file-completion ()
+  "This setting is buffer local."
+  (set (make-local-variable 'comint-completion-addsuffix) '("/" . "")))
+(add-hook 'sly-mrepl-hook #'ambrevar/do-not-append-space-after-file-completion)
+
 ;; REVIEW: With Emacs 27 we can:
 ;; (customize-set-variable 'helm-completion-style 'emacs)
 ;; (add-to-list 'completion-styles 'backend)