[3.9] bpo-42218: Correctly handle errors in left-recursive rules (GH-23065) (GH-23066)
Left-recursive rules need to check for errors explicitly, since
even if the rule returns NULL, the parsing might continue and lead
to long-distance failures.
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
(cherry picked from commit 02cdfc93f82fecdb7eae97a868d4ee222b9875d9)
Automerge-Triggered-By: GH:lysnikolaou
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index a95992d..1336231 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -964,6 +964,14 @@
"""
self._check_error(code, "invalid syntax")
+ def test_invalid_line_continuation_left_recursive(self):
+ # Check bpo-42218: SyntaxErrors following left-recursive rules
+ # (t_primary_raw in this case) need to be tested explicitly
+ self._check_error("A.\u018a\\ ",
+ "unexpected character after line continuation character")
+ self._check_error("A.\u03bc\\\n",
+ "unexpected EOF while parsing")
+
def test_main():
support.run_unittest(SyntaxTestCase)
from test import test_syntax