[XeTeX] additional beginL endL nodes in math

[David Carlisle]

>
> Is there a good tool or TeXnique that lets one see the contents of a
> math-stream, after all macros are processed, and during the internal
> page-construction stage?
> I'd like something a bit better than just examining box contents after
> using \tracingall .



 $x+y\showlists$

might be what you are looking for?
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