lua_iscfunction   168 lib/lua/lbaselib.c   if (lua_iscfunction(L, -1))  /* is a C function? */
lua_iscfunction   187 lib/lua/lbaselib.c   else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
lua_iscfunction   615 lib/lua/lbaselib.c   luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
lua_iscfunction   183 lib/lua/ldblib.c   if (lua_iscfunction(L, 1)) return 0;  /* cannot touch C upvalues from Lua */
lua_iscfunction   518 lib/lua/loadlib.c       lua_iscfunction(L, -1))
lua_iscfunction   137 lib/lua/lua.h  LUA_API int             (lua_iscfunction) (lua_State *L, int idx);