[metapost] mpost assertion failure

[Werner LEMBERG]

> [This is the i386-linux 2013 binary of mpost, version 1.802,
>  TeXLive SVN rev. 30584]
> 
> I've just got this while processing lilypond's fonts:
> 
>   mpost: ../../../texk/web2c/mplibdir/mp.w:2968:
>     mp_free_value_node: Assertion `p->has_number==2' failed.

I've just tested the updated i386-linux mpost binary in TeXLive
(rev. 30602), and I get exactly the same assertion, unfortunately.


    Werner