This sounds like a bug. Offhand, I don't know what changed to cause
this, but it probably shouldn't have!
Filing an issue at https://sourceforge.net/projects/xetex/ would be
useful, to help us keep track.
JK
On 15/04/2017 12:26, Bruno Le Floch wrote:
Dear all,
The primitive conditional "\ifcat\relax\cr true\else false\fi" gives
"true" in pdfTeX, LuaTeX, (e)(u)pTeX, and XeTeX from some time ago
(could be years), but "false" in XeTeX 0.99996
It would be useful for me to know which of \ifcat, \relax, and \cr
changed, to determine whether I should just special-case \cr in my
package, or use some other tool than \ifcat.
Best regards,
Bruno
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