type
  TTestObj = object of TObject
    x: string
    s: seq[int]

proc MakeObj(): TTestObj =
  result.x = "Hello"
  result.s = @[1,2,3]

proc inProc() = 
  for i in 1 .. 100_000_000:
    var obj: TTestObj
    obj = MakeObj()
    if getOccupiedMem() > 300_000: quit("still a leak!")

inProc()
echo "no leak: ", getOccupiedMem()