cell arrays as dynamic field names of structures

[Markus Appel]

Hi,

I found some of my scripts broken in the development version because I 
(inadvertently) used a cell array containing only one string element as 
dynamic field name for a structure:

In recent dev:
octave:1> S=struct('f',1);
octave:2> S.({'f'})
error: dynamic structure field names must be character strings

In 3.6.4:
octave:1> S=struct('f',1);
octave:2> S.({'f'})
ans =  1

Playing around some more I found that there seems to be some kind of bug 
in 3.6.4:
octave:8> S=struct('f',1);
octave:9> S.({'f'})
ans =  1
octave:10> S.({'f' 'g'})
ans =  1
octave:11> S.({'f' 'gg'})
error: structure has no member 'f'
octave:11> S.({'f' '%'})
ans =  1

I wanted to write a regression bug report, but now I have the feeling 
that this was a bug fix. I guess that even one-element cell arrays have 
never been supposed to be used as dynamic field names in the first place?

Cheers,
Markus