[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.

Attached are the input files to reproduce the assertion.  Note that
the code has always worked without any problems.


    Werner
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