static bool is_breakable (Grob *);
static bool is_extraneous_column_from_ligature (Grob *);
static Real minimum_distance (Grob *l, Grob *r);
static bool is_breakable (Grob *);
static bool is_extraneous_column_from_ligature (Grob *);
static Real minimum_distance (Grob *l, Grob *r);