Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu' 
-DCONF_VENDOR='unknown' 
-DLOCALEDIR='/homedir/otrocher/0/0/0/0/0/0/install_bash/share/locale' 
-DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux toxcf040 2.6.18-348.el5 #1 SMP Wed Nov 28 21:22:00 EST 2012 
x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.3
Patch Level: 30
Release Status: release

Description:
            [Detailed description of the problem, suggestion, or complaint.]

Hello,

I would like to report to you a problem I encounter with bash 4.3.30.
In the following example, VAR is undefined.

With bash 3.2, when I run the following commands:

if [ -d ${VAR:=""} ]
then
  echo yes
else
  echo no
fi

I get the no answer ("" is not a directory: correct behaviour).

If I run the same commands with bash 4.3.30, I get the yes answer, which seems 
to be a bad behavior.
Would it be possible to fix this issue?

Thank you,
Olivier

Repeat-By:
            [Describe the sequence of events that causes the problem
            to occur.]

Fix:
            [Description of how to fix the problem.  If you don't know a
            fix for the problem, don't include this section.]

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