From b5d6e6d56ff24027a98b2ed901e40dc69aa6761d Mon Sep 17 00:00:00 2001
From: dluyer <53582923+dluyer@users.noreply.github.com>
Date: Thu, 9 Jan 2020 14:33:55 -0800
Subject: Update _async.py

---
 pexpect/_async.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/pexpect/_async.py b/pexpect/_async.py
index ca2044e..1ecbe81 100644
--- a/pexpect/_async.py
+++ b/pexpect/_async.py
@@ -8,10 +8,7 @@ from pexpect import EOF
 def expect_async(expecter, timeout=None):
     # First process data that was previously read - if it maches, we don't need
     # async stuff.
-    previously_read = expecter.spawn.buffer
-    expecter.spawn._buffer = expecter.spawn.buffer_type()
-    expecter.spawn._before = expecter.spawn.buffer_type()
-    idx = expecter.new_data(previously_read)
+    idx = expecter.existing_data()
     if idx is not None:
         return idx
     if not expecter.spawn.async_pw_transport:
-- 
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