Primes in mathmode — the neverending story

Primes in mathmode — the neverending story

[Henri]

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Dear list,

For reference here some old thread on the same(?) topic.

https://mailman.ntg.nl/pipermail/ntg-context/2017/088699.html
https://mailman.ntg.nl/pipermail/ntg-context/2017/088747.html
https://mailman.ntg.nl/pipermail/ntg-context/2017/088926.html

I noticed, that the placement of the prime now depends on the placement in the source code.  If I
write \omega_n' the prime is placed in the exponent of the whole \omega_n atom rather than just the
\omega atom.  MWE is below.

At the same time, I do not see why the Plain TeX behaviour of an active prime in mathmode was
abandoned, because if I simply backport this, everything seems to work fine.

Cheers, Henri

---

\starttext

\startformula
  \omega_n' \neq \omega'_n
\stopformula

% ---

\catcode`@=11
% from plain.tex
\mathcode`\'="8000 % ^\prime
{\catcode`\'=\active \gdef'{^\bgroup\prim@s}}
\def\prim@s{\prime\futurelet\next\pr@m@s}
\def\pr@m@s{\ifx'\next\let\nxt\pr@@@s \else\ifx^\next\let\nxt\pr@@@t
  \else\let\nxt\egroup\fi\fi \nxt}
\def\pr@@@s#1{\prim@s} \def\pr@@@t#1#2{#2\egroup}

\startformula
  \omega_n' = \omega'_n
\stopformula

\stoptext

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