gc:arc memory leak #13659
Description
This code will cause a memory leak if compile with --gc:arc.
Example
type Foo = ref object data: int parent: Foo proc `=destroy`(self: var type(Foo()[])) = echo "destroy foo ", self.data for i in self.fields: i.reset proc getParent(self: Foo): Foo = self.parent var foo1 = Foo(data: 1) var foo2 = Foo(data: 2, parent: foo1) foo2.getParent.data = 1Current Output
destroy foo 2 Expected Output
destroy foo 2 destroy foo 1 Possible Solution 1
proc getParent(self: Foo): lent Foo = self.parentPossible Solution 2
var foo = foo2.getParent foo.data = 1Additional Information
$ nim -v Nim Compiler Version 1.1.1 [Windows: amd64] Compiled at 2020-03-16 Copyright (c) 2006-2019 by Andreas Rumpf