Incompatibilities between 3.0x and 3.1x

[agomez]

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2
uname output: Linux neutrino 2.6.12.4-bootsplash-mppe-squashfs-skas3-v8.2 #1 
Tue Aug 16 00:18:14 CEST 2005 i686 GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 3.1
Patch Level: 11
Release Status: release

Description:
        I've found some of my old scripts result in a syntax error. I 
don't know if it's an error in the parser, the scripts or the bash 
options.

Repeat-By:
        This fails in 3.1x but in 3.0x:

        sh-3.1$ let HI=(16-10)/2
        sh: let: /2: syntax error: operand expected (error token is 
"/2")

        This works:

        sh-3.1$ ((HOLA=(16-10)/2))

        --

        This fails in 3.1x but in 3.0x:

        sh-3.1$ for i in 1 2 3; do echo ${TOKEN["$i"]}; done
        sh: "1": syntax error: operand expected (error token is ""1"")

        This works:

        sh-3.1$ for i in 1 2 3; do echo ${TOKEN[$i]}; done