[issue33149] Parser stack overflows

[Ned Deily]

Change by Ned Deily :


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stage:  -> resolved
status: open -> closed

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[issue33149] Parser stack overflows

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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resolution:  -> duplicate

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[issue33149] Parser stack overflows

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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superseder:  -> s_push: parser stack overflow MemoryError

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[issue33149] Parser stack overflows

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Duplicate of issue3971

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nosy: +pablogsal

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[issue33149] Parser stack overflows

[Isaac Elliott]

Isaac Elliott  added the comment:

Because of the way recursive descent parsing works,

[[

is actually the minimal input required to reproduce this in python3.

In python2, the bug is still present, but requires a slightly deeper nesting:



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[issue33149] Parser stack overflows

[Isaac Elliott]

New submission from Isaac Elliott :

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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