[texhax] tabular, tabulary, tabularx, tabular* vs. rubber length ---> tabrule environment

[Johan Glimming]

Hi,

I would like to ask how I can create a tabular environment such that 
all columns stretches over the whole linewidth, and such that the 
left-most column and right-most column have no extra space, e.g.

| left-most       | middle    | middle     | rightmost |

            |______|       |___|       |____| extra space

I note that the tabulary environment has a different way to compute 
column width than tabular. However, when I give tabulary the width 
\linewidth, e.g.
\begin{tabulary}{\linewidth}{CCC} A & B & C \end{tabulary}, that does 
_not_ extend over the whole line. I tried to add \hspace{\stretch 1} 
after each table element to make it stretch into the whole line, but 
this made no difference. I tried the same thing with tabular but no 
difference.

In addition, in my wish list, is that fact that I would like all table 
elements to support a command \tag just like the gather-environment. I 
think this would give me a good setting for typesetting inference 
rules, since \tag can put a label to the left of each element. But 
perhaps I can embed the gather-environment in each element (this is 
cumbersome, but works). A better solution is to automatically begin a 
gather environment inside all tables inside this special "tabrule" 
environment.

Johan Glimming.