From: Ben Pfaff <blp@gnu.org>
Date: Mon, 7 Feb 2005 05:49:44 +0000 (+0000)
Subject: Clarify LOOP.
X-Git-Tag: v0.4.0~183
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=628ab44caeae14a2099dbd57341719f47d62a6bd;p=pspp-builds.git

Clarify LOOP.
---

diff --git a/doc/flow-control.texi b/doc/flow-control.texi
index 21450331..f1fe00e7 100644
--- a/doc/flow-control.texi
+++ b/doc/flow-control.texi
@@ -158,6 +158,12 @@ loop is executed MXLOOPS (@pxref{SET}) times.
 
 @cmd{BREAK} also terminates @cmd{LOOP} execution (@pxref{BREAK}).
 
+Loop index variables are by default reset to system-missing from one
+case to another, not left, unless a scratch variable is used as index.
+When loops are nested, this is usually undesired behavior, which can
+be corrected with @cmd{LEAVE} (@pxref{LEAVE}) or by using a scratch
+variable as the loop index.
+
 When @cmd{LOOP} or @cmd{END LOOP} is specified following @cmd{TEMPORARY}
 (@pxref{TEMPORARY}), the @cmd{LAG} function may not be used
 (@pxref{LAG}).