> Concerning, at least, the version 3.7.1-alpha.8820458+av228.msvc14.win64.
>
> Did anyone already know about this?
>
> ...\scenes\camera\mesh_camera\meshcam_persp_demo.pov
>
> Lines 57 and 59 have a #declare prefix=
>
> Line 61 has #declare
> mesh_file=concat(concat(concat(concat(concat(concat(prefix,str( {snip!}
>
> Keyword coloring is not shown in the 3.7.0.msvc10.win64 version.
>
> I encountered this a couple weeks ago and could not find anything about it at
> GitHub, wiki.povray or here.
>
> Bob
>
>

Also, all those nested concat do look rather suspicious to me, given 
that concat(...) can take an arbitrary number of parameters.
Maybe the nesting is interfering with keyword recognition and colouring.

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