For loop variable can't be a field !!

Strict

Class TA
    Field num:Int

    Method Init:TA()
        num = 69
        Return Self
    End Method
End

Class TC
    Field a:TA
End

Function Main:Int()

	local l:= New List<TA>
	l.AddLast(New TA().Init())
	l.AddLast(New TA().Init())
	
	Local c:TC = New TC

	For c.a = Eachin l
	    Print c.a.num
	Next
	
	
	local arr:TA[1]
	For arr[0] = Eachin l
	    Print arr[0].num
	Next

	Return 0
End Function

For [ Local ] IndexVariable = FirstValue To | Until LastValue [ Step StepValue ]
     Statements...
Next

...

If Local is not present, IndexVariable must be a valid, existing variable.