Request for Matlab output

[Lukas Reichlin]

Dear Octave community,

In order to improve error handling in the control package, I would like to know 
what Matlab’s output/error message looks like for each of the following three 
lines of code:

dss (1, 2, 3, 4, 0)

feedback (tf (1), tf (-1))

feedback (ss (1), ss (-1))

Could someone with access to Matlab and its Control System Toolbox please send 
me the resulting text output?

Thanks in advance,
Lukas