From 369a1cbdee14d9f27356fb3a8bb21e4fde289d25 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 12 Aug 2020 14:53:28 +0200
Subject: bpo-41520: codeop no longer ignores SyntaxWarning (GH-21838)

---
 Lib/codeop.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'Lib/codeop.py')

diff --git a/Lib/codeop.py b/Lib/codeop.py
index 7e192ea6a1..547629262d 100644
--- a/Lib/codeop.py
+++ b/Lib/codeop.py
@@ -84,9 +84,11 @@ def _maybe_compile(compiler, source, filename, symbol):
     except SyntaxError:
         pass
 
-    # Suppress warnings after the first compile to avoid duplication.
+    # Catch syntax warnings after the first compile
+    # to emit SyntaxWarning at most once.
     with warnings.catch_warnings():
-        warnings.simplefilter("ignore")
+        warnings.simplefilter("error", SyntaxWarning)
+
         try:
             code1 = compiler(source + "\n", filename, symbol)
         except SyntaxError as e:
-- 
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