From 26f55c29f2316648939ad12a9d3730a2118da2ea Mon Sep 17 00:00:00 2001
From: Pablo Galindo <Pablogsal@gmail.com>
Date: Sun, 12 May 2019 01:43:04 +0100
Subject: [PATCH] bpo-36817: Do not decrement reference for expr_text on
 fstring = parsing failure (GH-13256)

---
 Lib/test/test_fstring.py | 2 ++
 Python/ast.c             | 1 -
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index a0fae50d17..3484fcecf1 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -1148,6 +1148,8 @@ non-important content
         self.assertEqual(f'{C()=:x}', 'C()=FORMAT-x')
         self.assertEqual(f'{C()=!r:*^20}', 'C()=********REPR********')
 
+        self.assertRaises(SyntaxError, eval, "f'{C=]'")
+
     def test_walrus(self):
         x = 20
         # This isn't an assignment expression, it's 'x', with a format
diff --git a/Python/ast.c b/Python/ast.c
index 585f8b3fba..03da4e7f7f 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -5283,7 +5283,6 @@ unexpected_end_of_string:
     /* Falls through to error. */
 
 error:
-    Py_XDECREF(expr_text);
     return -1;
 
 }
-- 
2.40.0