[XeTeX] Confused (why are ignored characters not "removed from the input" as per Eijkhout's TeX by Topic ?)
Philip Taylor (RHBNC)
P.Taylor at Rhul.Ac.Uk
Sun Apr 16 18:16:09 CEST 2023
Given —
\catcode 9 = 9
\let ~ = \undefined
^^I~
\end
why does XeTeX report
This is XeTeX, Version 3.141592653-2.6-0.999993 (TeX Live 2021/W32TeX) (preloaded format=xetex)
restricted \write18 enabled.
entering extended mode
(./untitled-10.tex
! Undefined control sequence.
l.3 ^^I~
?
This output makes it appear that the offending control sequence is (or might be) ^^I~, whereas it is in fact simply ~. Should not the ^^I have been ignored rather than reported, as per line 1 ? Note line 3 does not really contain ^^I~ but rather <tab>~, but as tabs cannot be reliably included in e-mail I represent them here as ^^I. The ^^I in the transcript is genuine.
--
Philip Taylor
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