merge 3.2 (#14717)

diff --cc Objects/genobject.c
index 0fc14db89e7fd4a23a0fc5051467314e563c64c4,6e25f13475eadc985d3ab12dc8a9518d122b9f16..8c70b5ca1000db9ace303d789d1f1240e0f853b4
--- 1/Objects/genobject.c
--- 2/Objects/genobject.c
+++ b/Objects/genobject.c
@@@ -137,58 -129,8 +137,58 @@@ _PyGen_Send(PyGenObject *gen, PyObject 
  }
  
  PyDoc_STRVAR(close_doc,
- "close(arg) -> raise GeneratorExit inside generator.");
+ "close() -> raise GeneratorExit inside generator.");
  
 +/*
 + *   This helper function is used by gen_close and gen_throw to
 + *   close a subiterator being delegated to by yield-from.
 + */
 +
 +static int
 +gen_close_iter(PyObject *yf)
 +{
 +    PyObject *retval = NULL;
 +
 +    if (PyGen_CheckExact(yf)) {
 +        retval = gen_close((PyGenObject *)yf, NULL);
 +        if (retval == NULL)
 +            return -1;
 +    } else {
 +        PyObject *meth = PyObject_GetAttrString(yf, "close");
 +        if (meth == NULL) {
 +            if (!PyErr_ExceptionMatches(PyExc_AttributeError))
 +                PyErr_WriteUnraisable(yf);
 +            PyErr_Clear();
 +        } else {
 +            retval = PyObject_CallFunction(meth, "");
 +            Py_DECREF(meth);
 +            if (retval == NULL)
 +                return -1;
 +        }
 +    }
 +    Py_XDECREF(retval);
 +    return 0;
 +}
 +
 +static PyObject *
 +gen_yf(PyGenObject *gen)
 +{
 +    PyObject *yf = NULL;
 +    PyFrameObject *f = gen->gi_frame;
 +
 +    if (f) {
 +        PyObject *bytecode = f->f_code->co_code;
 +        unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode);
 +
 +        if (code[f->f_lasti + 1] != YIELD_FROM)
 +            return NULL;
 +        yf = f->f_stacktop[-1];
 +        Py_INCREF(yf);
 +    }
 +
 +    return yf;
 +}
 +
  static PyObject *
  gen_close(PyGenObject *gen, PyObject *args)
  {