Run go with no parameters on a late 2009 iMac. Mac does not support AVX instructions until 2012 (so far as I can tell). So while the OS support is up to High Sierra, the chip won't support the new version of go due to the src/runtime/preempt_amd64.s using VZEROUPPER from the AVX instruction set. 1.14rc1 did not use it and work fine.
Also note the version and env subcommands don't work either, I had to doctor the above output from 1.14rc1.