luaL_checklstring
else return luaL_checklstring(L, narg, len);
#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
LUALIB_API const char *(luaL_checklstring) (lua_State *L, int numArg,
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, 1, &ls);
const char *p = luaL_checklstring(L, 2, &lp);
luaL_checklstring(L, 1, &l);
const char *src = luaL_checklstring(L, 1, &srcl);
const char *p = luaL_checklstring(L, 2, &lp);
const char *s = luaL_checklstring(L, 1, &l);
const char *s = luaL_checklstring(L, arg, &l);
const char *strfrmt = luaL_checklstring(L, arg, &sfl);
const char *s = luaL_checklstring(L, 1, &l);