From 7ca6c55a4e2655dc0e5d780c3cc2ed7234edd72f Mon Sep 17 00:00:00 2001
From: Yury Selivanov <yselivanov@sprymix.com>
Date: Mon, 17 Aug 2015 14:46:51 -0400
Subject: [PATCH] Issue #24867: Fix asyncio.Task.get_stack() for 'async def'
 coroutines

---
 Lib/asyncio/tasks.py                 |  6 +++++-
 Lib/test/test_asyncio/test_pep492.py | 17 +++++++++++++++
 Lib/test/test_asyncio/test_tasks.py  | 32 ++++++++++++++++++++++++++++
 Misc/NEWS                            |  2 ++
 4 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 9bfc1cf8147..a235e742e23 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -128,7 +128,11 @@ class Task(futures.Future):
         returned for a suspended coroutine.
         """
         frames = []
-        f = self._coro.gi_frame
+        try:
+            # 'async def' coroutines
+            f = self._coro.cr_frame
+        except AttributeError:
+            f = self._coro.gi_frame
         if f is not None:
             while f is not None:
                 if limit is not None:
diff --git a/Lib/test/test_asyncio/test_pep492.py b/Lib/test/test_asyncio/test_pep492.py
index b702efcdfda..41e1b8a9e0c 100644
--- a/Lib/test/test_asyncio/test_pep492.py
+++ b/Lib/test/test_asyncio/test_pep492.py
@@ -186,6 +186,23 @@ class CoroutineTests(BaseTest):
         data = self.loop.run_until_complete(coro())
         self.assertEqual(data, 'spam')
 
+    def test_task_print_stack(self):
+        T = None
+
+        async def foo():
+            f = T.get_stack(limit=1)
+            try:
+                self.assertEqual(f[0].f_code.co_name, 'foo')
+            finally:
+                f = None
+
+        async def runner():
+            nonlocal T
+            T = asyncio.ensure_future(foo(), loop=self.loop)
+            await T
+
+        self.loop.run_until_complete(runner())
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index 251192acee4..04267873103 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -2,6 +2,7 @@
 
 import contextlib
 import functools
+import io
 import os
 import re
 import sys
@@ -162,6 +163,37 @@ class TaskTests(test_utils.TestCase):
                                    'function is deprecated, use ensure_'):
             self.assertIs(f, asyncio.async(f))
 
+    def test_get_stack(self):
+        T = None
+
+        @asyncio.coroutine
+        def foo():
+            yield from bar()
+
+        @asyncio.coroutine
+        def bar():
+            # test get_stack()
+            f = T.get_stack(limit=1)
+            try:
+                self.assertEqual(f[0].f_code.co_name, 'foo')
+            finally:
+                f = None
+
+            # test print_stack()
+            file = io.StringIO()
+            T.print_stack(limit=1, file=file)
+            file.seek(0)
+            tb = file.read()
+            self.assertRegex(tb, r'foo\(\) running')
+
+        @asyncio.coroutine
+        def runner():
+            nonlocal T
+            T = asyncio.ensure_future(foo(), loop=self.loop)
+            yield from T
+
+        self.loop.run_until_complete(runner())
+
     def test_task_repr(self):
         self.loop.set_debug(False)
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 27a05648cc6..a6f39498dc4 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -74,6 +74,8 @@ Library
 
 - Issue #24791: Fix grammar regression for call syntax: 'g(*a or b)'.
 
+- Issue #24867: Fix Task.get_stack() for 'async def' coroutines
+
 Documentation
 -------------