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Stack overflow in _extract_subtrees #14

@at5076

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@at5076

_extract_subtrees can't seem to handle large pointer levels. The following case consistently crashes with a stack overflow error:

`#define PTR1 * * * * * * * * * *
#define PTR2 PTR1 PTR1 PTR1 PTR1 PTR1 PTR1 PTR1 PTR1 PTR1 PTR1
#define PTR3 PTR2 PTR2 PTR2 PTR2 PTR2 PTR2 PTR2 PTR2 PTR2 PTR2
#define PTR4 PTR3 PTR3 PTR3 PTR3 PTR3 PTR3 PTR3 PTR3 PTR3 PTR3
#define PTR5 PTR4 PTR4 PTR4 PTR4 PTR4 PTR4 PTR4 PTR4 PTR4 PTR4
#define PTR6 PTR5 PTR5 PTR5 PTR5 PTR5 PTR5 PTR5 PTR5 PTR5 PTR5

int PTR4 q3_var = 0;`

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