[GiNaC-list] Bug? Segmentation while inverting a matrix

[Patrick Schulz]

Hi,

i'm getting a segmentation fault while inverting a matrix (the matrix
itself is invertable, i checked with the symbolic package for octave). 
Can anyone give me some pointers why this is happening? Is the matrix
ill-formed in some way or is this a bug?
Many thanks in advance!

I'm running archlinux (Kernel 4.14.12), my compiler is g++ 7.2.1, the
GiNaC version i'm using is 1.7.2. 

Attached is a sample listing which produces the error (at least on my
system).

Greetings,
Patrick
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