[dev-context] \lastxpos and \lastypos should behave like registers

[Hans Hagen]

On 5/23/2019 1:11 AM, Henri Menke wrote:
> Dear devs,
> 
> The two macros \lastxpos and \lastypos should behave like registers,
> because that is what they are in LuaTeX.  The following MWE fails with
> 
> ! You can't use `the character 0' after \the
> 
> \starttext
> \the\lastxpos
> \the\lastypos
> \stoptext
> 
> A simple fix would be to wrap the macro in \numexpr like in the attached
> patch.

hm, i was actually about to drop them completely ... anyway, i have no 
problem with the fix but then it also need to be \unexpanded
  (i'm reshuffling some code so probably no beta for a few days)

Hans

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