[issue33149] Parser stack overflows

[Isaac Elliott]

New submission from Isaac Elliott <isaace71295 at gmail.com>:

python3's parser stack overflows on deeply-nested expressions, for example:

[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]

or

aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa(aa()))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

These are both minimal examples, so if you remove one level of nesting from either then python3 will behave normally.

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messages: 314485
nosy: Isaac Elliott
priority: normal
severity: normal
status: open
title: Parser stack overflows
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33149>
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