Hello, I also got this error on OSX with an older Mac ( MacBookPro Late 2011). I got this error too on the Linux partition (KDE Neon =~ Ubuntu 16.04) using clang (oddly, gcc is fine).
The program is compiled with `-mavx2`, but the cpu of my Mac supports up to AVX instructions. Depending on the optimizations, the compiler may or may not use the entire instruction set available, and that's why it gets an _Illegal Instruction_ imo. I guess sdwfrost's Mac doesn't support AVX2 instruction too, but I didn't check. My take on this is the same I previously posted: [https://forum.nim-lang.org/t/3415/1](https://forum.nim-lang.org/t/3415/1)
