Hello,

as I might have mentioned before, I'm working on a ConTeXt module
that would give part of the functionality available in the LaTeX
package Nath; as I'm not really an expert in either of the topics
involved, I'm going at it slowly, starting with the simple things;
the first thing I implemented was a natural way to write
extensible arrows. It came up pretty fine and works quite good,
but there seems to be a sizing problem.

First of all, please find attached t-nath.tex (the module) and
nathtest.tex (a test file).

As you may notice if you compile the nathtest document, sub and
superscripts to the single-line arrows are much to high or low;
browsing about I noticed that in AMS-LaTeX the minus that extends
the single-line arrows is "smashed", to prevent this problem; I
did try to smash it (replacing \mathop- with \mathop{\smash-}),
but it didn't seem to help.

What do the experts here think?

-- 
Giuseppe "Oblomov" Bilotta