#define xCAT(A,B) A ## B
#define CAT(A,B) xCAT(A,B)
#undef EL
#define EL CAT(isl_,EL_BASE)
#define xFN(TYPE,NAME) TYPE ## _ ## NAME
#define FN(TYPE,NAME) xFN(TYPE,NAME)
#define xLIST(EL) EL ## _list
#define LIST(EL) xLIST(EL)