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discard """
  errormsg: "'y' is provably nil"
  line:25
"""

import strutils
{.experimental: "notnil".}

type
  TObj = object
    x, y: int

proc q(x: pointer not nil) =
  discard

proc p() =
  var x: pointer
  if not x.isNil:
    q(x)

  let y = x
  if not y.isNil:
    q(y)
  else:
    q(y)

p()