[GiNaC-list] bug in series()

[Mario Prausa]

Hi,

there seems to be a bug in the series() implementation. The attached
code causes a segfault.

As log(-x) doesn't depend on the expansion parameter ep, series() should
return log(-x). The bug only occurs, if x is defined as possymbol, so it
might have something to do with the branch cut of the logarithm.

I reproduced the bug with GiNaC 1.6.2 and the current git version.

Regards,
Mario

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