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5145 :: Why does this compile and work with --newRuntime

• Stefan_Salewski (orginal) [2019-08-29T15:01:25+02:00] view original

  # nim c --newruntime -r t.nim
  import OS
  type
    O = object
      i: int
      a: array[1024, int]
    
    R = ref  O
  
  proc t =
    var r: R = R(i: 2)
    # var r = R(i: 2) # OK
    # var r:  owned R = R(i: 2) # OK
    var x: R
    for i in 0 .. 1e7.int:
      r = nil
      r = R(i: i)
      sleep(1)
      echo type(r)
      x = r
      if i == 7:
        echo r.i
        echo getFreeMem()
  
  t()
  Run

  With

  # var r = R(i: 2) # OK
  # var r:  owned R = R(i: 2) # OK
  Run

  it works like expected by me, terminates due to dangling ref.

  But with var r: R = R(i: 2) it compiles and runs with --newruntime switch. From what I remember new() should infer a owned ref with newruntime.

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