class MyEnumerator : System.Collections.IEnumerator {
    hidden static [bool]$toggle = $true
    hidden static [bool]$toggle2 = $true

    MyEnumerator (){}

    [bool] MoveNext()
    {
        if([MyEnumerator]::toggle) {
            [MyEnumerator]::toggle = $false
            return $true
        } else {
            [MyEnumerator]::toggle = $true
            return $false
        }
    }

    [void] Reset()
    {
        [MyEnumerator]::toggle = $true
        [MyEnumerator]::toggle2 = $true
    }

    [object] get_Current()
    {
        if([MyEnumerator]::toggle2)
        {
            [MyEnumerator]::toggle2 = $false
            return [Object]$Null
        } else {
            [MyEnumerator]::toggle2 = $true
            return 'a'
        }
    }
}
class MyClass : System.Collections.IEnumerable {
    [System.Collections.IEnumerator] GetEnumerator()
    {
        return [MyEnumerator]::New()
    }

    MyClass(){
        [MyEnumerator]::toggle = $true
        [MyEnumerator]::toggle2 = $true
    }

    [int]$Count = 1
    [int]$Length = 1

}


$A = [MyClass]::New()
foreach ($i in $A) {
    $i
}
foreach ($i in $A) {
    $i
}