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newruntime: undetected dangling ref #11350

Araq opened this issue May 29, 2019 · 0 comments


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commented May 29, 2019

In the following program the dangling pointer is not detected:

  Node = ref object
    data: int

proc main =
  var x = Node(data: 3) # inferred to be an ``owned ref``
  var dangling = unown x
  assert == 3
  #dangling = nil
  # reassignment causes the memory of what ``x`` points to to be freed:
  x = Node(data: 4)
  # accessing 'dangling' here is invalid as it is nil.
  # at scope exit the memory of what ``x`` points to is freed
  if dangling != nil:


@Araq Araq added the New runtime label May 29, 2019

@Araq Araq closed this in 085a21e Jul 7, 2019

narimiran added a commit that referenced this issue Jul 8, 2019

fixes #11350
(cherry picked from commit 085a21e)
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