got := new(Float).SetPrec(53)
		got.Sqrt(NewFloat(r))
		want := NewFloat(math.Sqrt(r))
		if got.Cmp(want) != 0 {
			t.Fatalf("Sqrt(%g) =\n got %g;\nwant %g", r, got, want)
		}
	}
}

func TestFloatSqrt(t *testing.T) {
	for _, test := range []struct {
		x    string
		want string
	}{
		// Test values were generated on Wolfram Alpha using query
		//   'sqrt(N) to 350 digits'