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PATCH: status of let

The arithmetic documentation isn't explicit about the return status of
"let" and (( ... )); it's just hinted at in the example.  The
description of the "let" builtin is explicit, but you probably wouldn't
look there for documentation on (( ... )) having found the description
in the Arithmetic Evaluation section (and who uses the "let" builtin

Index: Doc/Zsh/arith.yo
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/arith.yo,v
retrieving revision 1.8
diff -u -r1.8 arith.yo
--- Doc/Zsh/arith.yo	24 Jul 2002 17:55:42 -0000	1.8
+++ Doc/Zsh/arith.yo	17 May 2005 10:38:44 -0000
@@ -21,7 +21,10 @@
 matching `tt(RPAR()RPAR())' are treated as a quoted expression and
 arithmetic expansion performed as for an argument of tt(let).  More
 precisely, `tt(LPAR()LPAR())var(...)tt(RPAR()RPAR())' is equivalent to
-`tt(let ")var(...)tt(")'.  For example, the following statement
+`tt(let ")var(...)tt(")'.  The return status is 0 if the arithmetic value
+of the expression is non-zero, and 1 otherwise.
+For example, the following statement
 example((( val = 2 + 1 )))
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070

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