[luatex] this can't happen error with Umiddle (luatex 1.07/texlive 2018)

[luigi scarso]

On Wed, May 16, 2018 at 10:16 AM, David Carlisle <d.p.carlisle at gmail.com>
wrote:

> The following plain tex example
>
>
> $\left( A \middle|  \right)$ %OK
>
>
>
> $\Uleft( A \Umiddle class 2 | B \Uright)$ %OK
>
>
> $\Uleft( A \Umiddle class 2 | \Uright)$ %oops
>
> \bye
>
> produces
>
>
> ! This can't happen (mathspacing).
> l.10 $\Uleft( A \Umiddle class 2 | \Uright)$
>                                            %oops
> !  ==> Fatal error occurred, no output PDF file produced!
>
> We are seeing it
(at least the "can fix can fix" in the message is fixed)
-- 
luigi
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