Description of problem:
The man page for tcsh says that strings which begin with '0' are considered
octal numbers, but they aren't actually treated as such by tcsh.

From tcsh(1):
"Strings which begin with ‘0’ are considered octal numbers. Null or missing
arguments are considered ‘0’. The results of all expressions are strings, which
represent decimal numbers. It is important to note that no two components of an
expression can appear in the same word; except when adjacent to components of
expressions which are syntactically significant to the parser (‘&’ ‘|’ ‘<’ ‘>’
‘(’ ‘)’) they should be surrounded by spaces."

Version-Release number of selected component (if applicable):
tcsh-6.14-12.el5
Red Hat Enterprise Linux Server release 5.1 (Tikanga)

How reproducible:
100%

Steps to Reproduce:
1.
$ cat > test.sh << EOF
#! /bin/tcsh
# test 1
@ i = -020
echo $i
# test 2
if (010 * 2 == 16) then
    echo "16"
endif
# test 3
( exit 010 )
echo $?
EOF

2.
$ ./test.sh 

Actual results:
$ ./test.sh 
-20
10

Expected results:
$ ./test.sh 
-16
16
8

Additional info:
Upstream bug: http://bugs.gw.com/view.php?id=54
Backported patch for RHEL 5 is attached.