Carry the lookahead and bare-# fixes into the playground (engine v0.222.0) - #159
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Three engine fixes reach the browser here:
- a scan that looks ahead (a glue's "plus", a number's next digit) expands but
no longer EXECUTES, so \abovecaptionskip=40pt\begin{figure} keeps its 40pt
instead of losing it at \end (engine#357);
- a bare # is passed as the argument it is, instead of eating the token after it
and then the rest of the file (engine#359);
- \meaning names all nine of TeX's character categories, not four (engine#359);
- GOTEX_TRACE reports what a runaway expansion was looping on (engine#358).
Playground tests green; Sigma on the 154-paper corpus is unchanged (298), as
these are correctness fixes rather than pagination ones.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Engine v0.222.0 in the browser:
plus, or an integer scan looking for one more digit, used to run\begin's group-opening probe — so\abovecaptionskip=40pt\begin{figure}finished the assignment inside the environment and\endrestored the old value. TeX stops such a lookahead in front of any executable primitive (tex.web §380).#kept what followed it (A bare # kept what followed it engine#359).\edef\x{\take#}swallowed the closing}and then the rest of the file. That one line is pgf's, so\usetikzlibrary{svg.path}took every document that loads it down with it.\meaningnames all nine character categories, not four (same PR) —#no longer reports as "the character".GOTEX_TRACEnames the macro a runaway expansion is looping on (GOTEX_TRACE: a runaway names the macro that loops engine#358).Playground tests green. Σ on the 154-paper corpus is unchanged at 298: these are correctness fixes, not pagination ones.
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