bug in who?

[Robert T. Short]

Interesting behavior of "who".

I will look at this sometime, but probably not for a couple of weeks.  
If someone has time and knows how to fix it quickly....

I did this on a debian system using the octave I built from the tip this 
morning.



./run-octave
GNU Octave, version 3.1.55
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FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Octave was configured for "i686-pc-linux-gnu".

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Report bugs to <address@hidden> (but first, please read
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octave:1> x=1
x =  1
octave:2> who
Variables in the current scope:

ans  x

octave:3> clear x
octave:4> x
error: `x' undefined near line 4 column 1
octave:4> who
Variables in the current scope:

ans  x

octave:5>