#define CHECK_BORDER (CHECK_HEAD | CHECK_TAIL)
#define CHECK_ALL (CHECK_BORDER | CHECK_INSIDE)
-extern Lisp_Object Qcomposition;
extern Lisp_Object composition_hash_table;
extern ptrdiff_t get_composition_id (ptrdiff_t, ptrdiff_t, ptrdiff_t,
Lisp_Object, Lisp_Object);