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

PyPy and potentially other implementations have different or no
contraints on the number of blocks that can be statically nested. move
the test that checks for this behaviour into a unit test and mark it as
CPython-only.
This commit is contained in:
Carl Friedrich Bolz-Tereick 2021-08-28 20:33:50 +02:00 committed by GitHub
parent 206b21ed9f
commit eb263f9a35
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1 changed files with 35 additions and 32 deletions
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67
Lib/test/test_syntax.py
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@ -629,38 +629,6 @@ isn't, there should be a syntax error.
...
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():
@ -1550,6 +1518,41 @@ case(34)
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)