bpo-2180: Treat line continuation at EOF as a `SyntaxError` (GH-13401)
This makes the parser consistent with the tokenize module (already the case
in `pypy`).
sample
------
```python
x = 5\
```
before
------
```console
$ python3 t.py
$ python3 -mtokenize t.py
t.py:2:0: error: EOF in multi-line statement
```
after
-----
```console
$ ./python t.py
File "t.py", line 3
x = 5\
^
SyntaxError: unexpected EOF while parsing
$ ./python -m tokenize t.py
t.py:2:0: error: EOF in multi-line statement
```
https://bugs.python.org/issue2180diff --git a/Lib/test/test_eof.py b/Lib/test/test_eof.py
index 7baa7ae..a091cea 100644
--- a/Lib/test/test_eof.py
+++ b/Lib/test/test_eof.py
@@ -1,7 +1,9 @@
"""test script for a few new invalid token catches"""
-import unittest
+import sys
from test import support
+from test.support import script_helper
+import unittest
class EOFTestCase(unittest.TestCase):
def test_EOFC(self):
@@ -24,5 +26,27 @@
else:
raise support.TestFailed
+ def test_line_continuation_EOF(self):
+ """A contination at the end of input must be an error; bpo2180."""
+ expect = 'unexpected EOF while parsing (<string>, line 1)'
+ with self.assertRaises(SyntaxError) as excinfo:
+ exec('x = 5\\')
+ self.assertEqual(str(excinfo.exception), expect)
+ with self.assertRaises(SyntaxError) as excinfo:
+ exec('\\')
+ self.assertEqual(str(excinfo.exception), expect)
+
+ @unittest.skipIf(not sys.executable, "sys.executable required")
+ def test_line_continuation_EOF_from_file_bpo2180(self):
+ """Ensure tok_nextc() does not add too many ending newlines."""
+ with support.temp_dir() as temp_dir:
+ file_name = script_helper.make_script(temp_dir, 'foo', '\\')
+ rc, out, err = script_helper.assert_python_failure(file_name)
+ self.assertIn(b'unexpected EOF while parsing', err)
+
+ file_name = script_helper.make_script(temp_dir, 'foo', 'y = 6\\')
+ rc, out, err = script_helper.assert_python_failure(file_name)
+ self.assertIn(b'unexpected EOF while parsing', err)
+
if __name__ == "__main__":
unittest.main()