I ran into a incredible frustrating issue where my compiler was seg faulting
due to missing a `ref` in a type declaration. In the below code just swapping
`Node[T] = object` to `Node[T] = ref object` stops the seg fault and compiles
and runs as expected. In fact on MacOS I don't even get the segfault error,
`Segmentation fault (core dumped)`, instead the compiler just mysteriously
stopped. The same thing happens with the devel branch I grabbed from
`choosenim`.
type
Node[T] = object
item: T
next: Node[T]
Bag*[T] = ref object
first: Node[T]
size: int
Run
You can reproduce the seg fault here:
[https://play.nim-lang.org/#ix=2u3O](https://play.nim-lang.org/#ix=2u3O)
Code from link:
import random
type
Node[T] = object
item: T
next: Node[T]
Bag*[T] = ref object
first: Node[T]
size: int
func isEmpty*(bag: Bag): bool =
bag.first == nil
func size*(bag: Bag): int =
bag.size
func add*[T](bag: Bag[T], item: T): void =
var oldFirst = bag.first
bag.first = new(Node[T])
bag.first.item = item
bag.first.next = oldFirst
bag.size += 1
var testBag = new(Bag[int])
for i in 1 .. 10:
randomize()
testBag.add(i * rand(100))
echo "Is the bag empty: " & $testBag.isEmpty
echo "Bag size: " & $testBag.size
Run
