discard """
  output: '''works'''
"""

#  bug #11095

type
  MyVal[T] = object
    f: ptr T

proc `=destroy`[T](x: var MyVal[T]) =
  if x.f != nil:
    dealloc(x.f)

proc `=sink`[T](x1: var MyVal[T], x2: MyVal[T]) =
  if x1.f != x2.f:
    `=destroy`(x1)
    x1.f = x2.f

proc `=`[T](x1: var MyVal[T], x2: MyVal[T]) {.error.}

proc newVal[T](x: sink T): MyVal[T] =
  result.f = create(T)
  result.f[] = x

proc set[T](x: var MyVal[T], val: T) =
  x.f[] = val

proc sinkMe[T](x: sink MyVal[T]) =
  discard

var flag = false

proc main =
  var y = case flag
    of true:
      var x1 = newVal[float](1.0)
      var x2 = newVal[float](2.0)
      (newVal(x1), newVal(x2))

    of false:
      var x1 = newVal[float](1.0)
      var x2 = newVal[float](2.0)
      (newVal(x1), newVal(x2))

  sinkMe y[0]
  sinkMe y[1]
  echo "works"

main()