[luatex] Behaviour of \mathstyle

[Hans Hagen]

On 4/9/2016 11:46 AM, Joseph Wright wrote:
> Hello all,
>
> As noted by Enrico Gregorio
> (http://chat.stackexchange.com/transcript/message/28883985#28883985),
> the behaviour of \mathstyle seems to be odd:
>
>      $\scriptstyle\count255=\mathstyle 3 \the\count255$\par
>      $\scriptstyle\count255=\scriptstyle 3 \the\count255$\bye
>
> Unlike similar variables, \mathstyle is not terminated correctly. I also
> see that \(show)the\mathstyle is an error rather than what one might
> expect here.
>
> The manual doesn't specify, but I assume this is not deliberate?

the manual specifies that it's a convert command (and readonly) so it 
just injects a sequence of tokens

you can use

\numexpr\mathstyle\relax

if you want to terminate

Hans

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