What if we re-assign a ref variable to another (or same) element
of a DynamicArray:
var nums = int[] # DynamicArray(int)
ref foo : int
nums += 1
nums += 2
foo => nums[0] # nums.=>(0, foo)
foo = 42
foo => nums[1] # nums.=>(1, foo)
Given the definition of DynamicArray's operator =>:
func => (index, r:ref T)
{
refs[index] += r
}
...it would mean that refs would hold two instances foo (at
different indices).
Also, it looks like r is passed as a copy of a ref variable,
which to me would indicate that saying r => null wouldn't nullify
the original ref variable from which r was made a copy of (in
this case ref variable foo).
