From 2b249216eba72f0ea9700b7eede3711ff45a1327 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Fri, 7 Oct 2016 21:47:34 -0700
Subject: Check for self-assignment in replace_struct.

* struct.c (replace_struct): If target and source
are the same object, just do nothing and return
target.

* txr.1: Document self-assignment and return
value of replace-struct.
---
 txr.1 | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'txr.1')

diff --git a/txr.1 b/txr.1
index c1fc78ce..c7fde830 100644
--- a/txr.1
+++ b/txr.1
@@ -21521,6 +21521,17 @@ prior to using
 .codn replace-struct ,
 or to take other measures to handle the situation.
 
+If the
+.meta target-obj
+and
+.meta source-obj
+arguments are the same object,
+.code replace-struct
+has no effect.
+
+The return value is
+.metn target-obj .
+
 .coNP Function @ method
 .synb
 .mets (method < struct-obj << slot-name )
-- 
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