[tex-k] Possible error in The TeXbook Chapter 24

Julian Gilbey julian at d-and-j.net
Sun Oct 27 08:25:46 CET 2019

On Thu, Oct 24, 2019 at 05:08:39PM -0600, Karl Berry wrote:
>     So the formal syntax for <optional true> should be:
>     > <optional {\tt true}>\is<optional spaces>
>     >   \alt<optional {\tt true}>[true]<optional spaces>
> I think you are right. I will put on the pile for Don's next review (in
> 2021). Thanks!

I think there's a typo here, as that would allow the impermissible

Rather, the following appears to be the correct replacement:
  <optional {\tt true}>\is<optional spaces>
    \alt<optional spaces>[true]<optional spaces>

Best wishes,


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