Am 24.01.2026 um 20:23 schrieb Rogers, Michael K:
Hi,
It appears that \hskip is parsing the “P” as part of the skip amount.
You get similar trouble with “M”, “p”, and “m”.
Engines like pdfTeX or LuaTeX are stricter and expect the complete
optional argument (e.g. plus or minus) but LuaMetaTeX only takes a look
at the first letter the determine (e.g. p or m) if it's an optional
argument.
Putting \relax at the end of the skip amount works for me. Perhaps there
is a better solution?
…
\hskip 1ex def proba(k):
\hskip 1ex\relax P = 0
\hskip 1ex for i in range(0,k+1):
…
A recent addition to the dimension (and number) scanner in LuaMetaTeX
are braced arguments which removes the need for \relax, in addition you
can use \numexpr expression (e.g. \hskip{1em+2em}).
\starttext
a\hskip 1em b
a\hskip 1em plus 1em b
a\hskip {1em} plus 1em b
\stoptext
Wolfgang
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