[tex-live] pdftex segfault with \pdflastmatch

[Akira Kakuto]

Hi David,

> This plain tex document demonstrates \pdflastmatch failing if used after
> a \pdfmatch that returned no matches.

The crash disappears if I apply an attached utils.c.diff.
But I don't know that the patch is right or not.

Best,
Akira
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