DECLARE_SCHEME_CALLBACK (brew_molecule, (SCM ));
static Interval head_extent (Grob*, Axis);
static Molecule brew_ledger_lines (Grob *me, int pos, int interspaces,
DECLARE_SCHEME_CALLBACK (brew_molecule, (SCM ));
static Interval head_extent (Grob*, Axis);
static Molecule brew_ledger_lines (Grob *me, int pos, int interspaces,