var math/big.threeOnce

4 uses

	math/big (current package)
		sqrt.go#L12: var threeOnce struct {
		sqrt.go#L18: 	threeOnce.Do(func() {
		sqrt.go#L19: 		threeOnce.v = NewFloat(3.0)
		sqrt.go#L21: 	return threeOnce.v