Let's get the semantic around closure fixed.

[Paul Backus]

On Tuesday, 18 May 2021 at 17:53:20 UTC, Ola Fosheim Grostad 
wrote:
>
> Does a delegate do anything more than retaining a pointer to 
> the stack record?
> Anyway, it should not escape the scope it references. So escape 
> analysis is your friend.

The compiler does escape analysis and pre-emptively allocates any 
variables that escape through closures on the GC heap.

The bug here is that, for variables declared in loop bodies, the 
compiler *should* allocate a new copy on the heap for each loop 
iteration, but instead it only allocates one copy that's reused 
across all iterations.