[tex-k] Exercise 22.1 of The TeXbook

[Karl Berry]

Hi Hanson - back on your report from February:

    https://tug.org/pipermail/tex-k/2024-February/004009.html
    While the exercise [22.1] appears to be targeted at beginners due to
    the absence of a "dangerous bend," the solution provided utilizes a
    "\frac" macro from a more advanced exercise (11.6).

We agree it's not optimal, but there does not seem to be any way to
ameliorate the situation. I wrote a note about it at
https://tug.org/texmfbug/nobug.html#fracdbend

I didn't write it there specifically, but as a general point, by this
time Knuth wants to fix errors, not make improvements. Admittedly there
is a big gray area there, but I think this falls more into the
"improvement" category. It was never his explicit, or implicit, goal to
make the non-dbend material readable fully independent of the dbend
material; I doubt that's even possible.

Thanks for the report,
Karl