boolrace.go

package main

var target bool

func writer() {
	for {
		target = false
		target = true
	}
}

func reader() {
	for {
		local := target
		if !(local == false || local == true) {
			panic("this condition is nonsensical")
		}
	}
}

func main() {
	go writer()
	go reader()
	select {}
}

intrace.go

package main

var target int

const (
	LOW =  0
	HIGH = (1 << 31) - 1
)

func writer() {
	for {
		target = LOW
		target = HIGH
	}
}

func reader() {
	for {
		local := target
		if !(local == LOW || local == HIGH) {
			panic("interleave observed")
		}
	}
}

func main() {
	target = LOW

	go writer()
	go reader()
	select {}
}