I was surprised to see literally invalid names in the "bad" section, e.g. "Cannot start with a digit". Why even presenting this if it's rejected by the compiler?
I wondered if you could sneak in some unicode digit but it seems to reject those too:
$ go run z.go
# command-line-arguments
./z.go:6:2: identifier cannot begin with digit U+0661 '١'
./z.go:7:27: identifier cannot begin with digit U+0661 '١'