\interlinepenalties

The etex manual decribes beside \clubpenalties also
\interlinepenalties as a companion to \interlinepenalty. 

But up to now I wasn't able to make use of it. E.g. 

~~~~
\showboxbreadth\maxdimen\showboxdepth\maxdimen \tracingoutput=1

%\interlinepenalty 100
\interlinepenalties 3 10 20 30 

\clubpenalties 3 66 77 88

a\break bb \break c \break d \break e

\bye
~~~~

gives penalties 66 77 88 and ignores the additional interline
penalties. I tried also in luatex and xetex with the same result.

Is that suppose to work??


-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/