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bpo-25130: Make unit-test about restricting the maximum number of nested blocks cpython-only #28002

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Merged
serhiy-storchaka merged 1 commit into from
Aug 28, 2021
Merged

bpo-25130: Make unit-test about restricting the maximum number of nested blocks cpython-only #28002

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67 changes: 35 additions & 32 deletions Lib/test/test_syntax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -629,38 +629,6 @@
...
SyntaxError: 'break' outside loop

This raises a SyntaxError, it used to raise a SystemError.
Context for this change can be found on issue #27514

In 2.5 there was a missing exception and an assert was triggered in a debug
build. The number of blocks must be greater than CO_MAXBLOCKS. SF #1565514

>>> while 1:
... while 2:
... while 3:
... while 4:
... while 5:
... while 6:
... while 8:
... while 9:
... while 10:
... while 11:
... while 12:
... while 13:
... while 14:
... while 15:
... while 16:
... while 17:
... while 18:
... while 19:
... while 20:
... while 21:
... while 22:
... break
Traceback (most recent call last):
...
SyntaxError: too many statically nested blocks

Misuse of the nonlocal and global statement can lead to a few unique syntax errors.

>>> def f():
Expand Down Expand Up @@ -1550,6 +1518,41 @@ def test_multiline_compiler_error_points_to_the_end(self):
lineno=3
)

@support.cpython_only
def test_syntax_error_on_deeply_nested_blocks(self):
# This raises a SyntaxError, it used to raise a SystemError. Context
# for this change can be found on issue #27514

# In 2.5 there was a missing exception and an assert was triggered in a
# debug build. The number of blocks must be greater than CO_MAXBLOCKS.
# SF #1565514

source = """
while 1:
while 2:
while 3:
while 4:
while 5:
while 6:
while 8:
while 9:
while 10:
while 11:
while 12:
while 13:
while 14:
while 15:
while 16:
while 17:
while 18:
while 19:
while 20:
while 21:
while 22:
break
"""
self._check_error(source, "too many statically nested blocks")


def test_main():
support.run_unittest(SyntaxTestCase)
Expand Down