// Creates and returns a reference to a set from an existing slice
func NewSetFromSlice(s interface{}) Set {
a := NewSet()
slice := utils.InterfaceSlice(s)
for _, item := range slice {
a.Add(item)
}
return a
}
func CheckCount(slice interface{}, expected int, t *testing.T, descr string) {
slice_ := utils.InterfaceSlice(slice)
if len(slice_) != expected {
t.Errorf("%v expected %v, have %v", descr, expected, len(slice_))
}
}