[luatex] luatex crash when \hyphenation contains a discretionary

[Hans Hagen]

On 5/19/2018 6:01 PM, Ulrike Fischer wrote:
> Am Mon, 7 May 2018 12:38:23 +0200 schrieb Ulrike Fischer:
> 
>> When I compile this document with context + luatex 1.08 luatex
>> crashes:
> 
> [...]
> 
> The crash no longer happens with a luatex 1.09.
> 
> But now I wonder, is there/should there be a difference between
> 
> \hyphenation{mul-ti{-}{}{-}word{-}{}{-}boun-daries}
> 
> and
> 
> \hyphenation{mul-ti=word=boun-daries}
> 
> ?  In my tests they give the same output.
if you input

multi-word-boundaries

that becomes

multi<disc>word<disc>boundaries

and when matching the = is just a skip operation so we jump over the 
<disc> and it stays

as {-}{}{-} injects a similar disc indeed you get the same

Hans

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