var crypto/elliptic.p521

5 uses

	crypto/elliptic (current package)
		elliptic.go#L145: var _ = []unmarshaler{p224, p256, p384, p521}
		elliptic.go#L279: 	return p521
		nistec.go#L73: var p521 = &nistCurve[*nistec.P521Point]{
		nistec.go#L78: 	p521.params = &CurveParams{
		params.go#L328: 	for _, c := range []Curve{p224, p256, p384, p521} {