[luatex] New \pdf... primitives

[Hans Hagen]

On 11/17/2015 1:35 AM, David Carlisle wrote:

> !  ==> Fatal error occurred, no output PDF file produced!
>
> so no ? prompt or recovery, it just stops.

in fact such errors being fatal is true for most backend related errors 
which normally are not recoverable (and seldom used by users) ... in the 
current version errors and warnings are at least now all using the same 
methods (so we have tex errors, with this prompt, backend/lua warnings 
and tex/backend/lua errors where the later quits the run (as one has to 
fix something fundamental)

Hans

btw, i wonder if we need to keep this v/horigin stuff as i suppose latex 
also sets is to "1 true in"

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