From 499e715e2f31fc7f9e50dfb553532aedaba1dd3f Mon Sep 17 00:00:00 2001
From: Michael Heerdegen <michael_heerdegen@web.de>
Date: Sun, 28 Oct 2018 23:30:49 +0100
Subject: [PATCH] WIP: pcase pattern side effects

---
 lisp/emacs-lisp/pcase.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/emacs-lisp/pcase.el b/lisp/emacs-lisp/pcase.el
index 57c2d6c3cb..ff59d2c3a0 100644
--- a/lisp/emacs-lisp/pcase.el
+++ b/lisp/emacs-lisp/pcase.el
@@ -139,6 +139,9 @@ pcase
   (F ARG1 .. ARGn)
      call F with ARG1..ARGn and EXPVAL as n+1'th argument
 
+Evaluating a FUN, BOOLEXP or EXPR as described above should not have
+any side effects.
+
 FUN, BOOLEXP, EXPR, and subsequent PAT can refer to variables
 bound earlier in the pattern by a SYMBOL pattern.
 
-- 
2.19.1