add "gi_yieldfrom" to generators and "cr_await" to coroutines (Python issue 24450)

Cython/Utility/Coroutine.c

@@ -1172,6 +1172,8 @@ static PyMethodDef __pyx_Coroutine_methods[] = {
 
 static PyMemberDef __pyx_Coroutine_memberlist[] = {
     {(char *) "cr_running", T_BOOL, offsetof(__pyx_CoroutineObject, is_running), READONLY, NULL},
+    {(char*) "cr_yieldfrom", T_OBJECT, offsetof(__pyx_CoroutineObject, yieldfrom), READONLY,
+     (char*) PyDoc_STR("object being awaited, or None")},
     {0, 0, 0, 0, 0}
 };
 
@@ -1288,6 +1290,8 @@ static PyMethodDef __pyx_Generator_methods[] = {
 
 static PyMemberDef __pyx_Generator_memberlist[] = {
     {(char *) "gi_running", T_BOOL, offsetof(__pyx_CoroutineObject, is_running), READONLY, NULL},
+    {(char*) "gi_yieldfrom", T_OBJECT, offsetof(__pyx_CoroutineObject, yieldfrom), READONLY,
+     (char*) PyDoc_STR("object being iterated by 'yield from', or None")},
     {0, 0, 0, 0, 0}
 };
 

tests/run/yield_from_pep380.pyx

@@ -1071,3 +1071,18 @@ def yield_in_return(x):
     True
     """
     return (yield from x)
+
+
+def gi_yieldfrom(it):
+    """
+    >>> it = iter([1, 2, 3])
+    >>> g = gi_yieldfrom(it)
+    >>> g.gi_yieldfrom is None or "ERROR: %r" % g.gi_yieldfrom
+    True
+    >>> next(g)
+    1
+    >>> g.gi_yieldfrom is it or "ERROR: %r" % g.gi_yieldfrom
+    True
+    """
+    x = yield from it
+    return x