m[nan] = 1
	m[nan] = 2
	m[nan] = 4
	testMapNan(t, m)
}

// nan is a good test because nan != nan, and nan has
// a randomized hash value.
func TestMapOperatorAssignmentNan(t *testing.T) {
	m := make(map[float64]int, 0)
	nan := math.NaN()

	// Test assignment operations.
	m[nan] += 1
	m[nan] += 2
	m[nan] += 4
	testMapNan(t, m)
}

func TestMapOperatorAssignment(t *testing.T) {