Just read about this cam on dpreview, i have tried to open a sample from there and from raw.pixls.us, and art (linux64) crashes.
https://raw.pixls.us/getfile.php/572/nice/Canon%20-%20PowerShot%20Pro70.CRW
Not a mainstream camera anyway 
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ART crashed on Windows 10, too. I had to reboot my PC to run ART again.
Confirmed.
It does open in RawTherapee though, but the image is very blue. All the color balance sliders are set to 0…
Thanks everybody for the report and tests. That file uses a 4-color GMCY CFA, something ART definitely doesn’t support. I’ve just added a safeguard against that kind of files.