gc:arc destroys the global variable accidentally.

[khchen]

Compile with --gc:arc.

Example

type Variable = ref object
  value: int

proc `=destroy`(self: var type(Variable()[])) =
  echo "destroying variable"

proc newVariable(value: int): Variable =
    result = Variable()
    result.value = value

proc test(count: int) =
  var v {.global.} = newVariable(10)

  var count = count - 1
  if count == 0: return

  test(count)
  echo "destroyed: ", v.isNil

test(3)

Current Output

destroying variable
destroyed: true
destroyed: true

Expected Output

destroyed: false
destroyed: false

Additional Information

• It was working without --gc:arc

$ nim -v
Nim Compiler Version 1.1.1 [Windows: amd64]
Compiled at 2020-03-19
Copyright (c) 2006-2019 by Andreas Rumpf