From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Sun, 22 Sep 2019 16:54:48 +0000 (-0400)
Subject: * lisp/help-fns.el: Fix missing dependency
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* lisp/help-fns.el: Fix missing dependency
---

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index 3c0a72e2634..d6b4e763bbc 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -35,6 +35,7 @@
 (require 'cl-lib)
 (require 'help-mode)
 (require 'radix-tree)
+(eval-when-compile (require 'subr-x))   ;For when-let.
 
 (defvar help-fns-describe-function-functions nil
   "List of functions to run in help buffer in `describe-function'.