It would be helpful to get some analysis on this known problem before the beta release.

It looks like there is a leak of symtable entries. In particular, symtable_enter_scope has if (st->st_cur) { prev = st->st_cur; if (PyList_Append(st->st_stack, (PyObject *)st->st_cur) < 0) { Py_DECREF(st->st_cur); st->st_errors++; return; } } st->st_cur = (PySymtableEntryObject *)\ PySymtableEntry_New(st, name, type, lineno); if (strcmp(name, TOP) == 0) st->st_global = st->st_cur->ste_symbols; if (prev) if (PyList_Append(prev->ste_children, (PyObject *)st->st_cur) < 0) st->st_errors++; First, it seems that Py_XDECREF(prev); is missing. That alone does not fix the leak, though, since prev is always null in the test case. The real problem comes from st_cur never being released, AFAICT. There is a DECREF in symtable_exit_scope, but that function is not called in the test case - symtable_enter_scope is called. For symmetry reasons, it appears that there should be a call to symtable_exit_scope of the global scope somewhere (which apparently is build in symtable_build). I can't figure how what the correct place for that call would be, though. Regards, Martin