race

const Enabled = false

We can use this constant to determine whether or not the Go Race Detector is enabled. If the race detector is enabled, the `race` build tag is passed, so this file won't be compiled, where the other one (./enabled.go) will be. That is, if the race detector is enabled, the constant below will be false. Otherwise, it'll be true. It's kinda weird, but it's also how go itself does it: https://github.com/golang/go/blob/master/src/internal/race/race.go#L15