variables created differently in 3.1.53

[John W. Eaton]

On  9-Mar-2009, Francesco Potorti` wrote:

| ===File ~/math/workarea/bug.m===============================
| exist("r","var")
| whos
| 
| if false
|   r = 2;
| endif
| ============================================================
| 
| 
| In 3.1.52:
| 
| octave> clear all
| octave> bug
| ans = 0
| Variables in the current scope:
| 
|   Attr Name        Size                     Bytes  Class
|   ==== ====        ====                     =====  ===== 
|        ans         1x1                          8  double
| 
| Total is 1 element using 8 bytes
| 
| 
| In 3.1.53:
| 
| octave> clear all
| octave> bug
| ans =  1
| Variables in the current scope:
| 
|   Attr Name        Size                     Bytes  Class
|   ==== ====        ====                     =====  ===== 
|        ans         1x1                          8  double
|        r           0x0                          0  double
| 
| Total is 1 element using 8 bytes

I can't duplicate this problem in the current sources.  I think the
following patch is the one that fixed this problem.  It is part of
3.1.54.

  http://hg.savannah.gnu.org/hgweb/octave/rev/8ed42c679af5

jwe