Makes sense, although I chuckled when I realized that the creator of that
issue didn't actually have his issue resolved.
Creator: This behavior is undefined. Which one should it be?
Go Team: Both.
😆
On Wed, May 4, 2022 at 12:46 PM Ian Lance Taylor <i...@golang.org> wrote:
> On Tue, May 3, 2022 at 10:59 PM 'Axel Wagner' via golang-nuts
> <golang-nuts@googlegroups.com> wrote:
> >
> >> As a tangent, I don't understand why this wasn't made unambiguous in
> the language spec. Why not have `new(struct{})` always allocate a new
> pointer? Who's allocating all these empty structs on the heap where this is
> something that needs to be optimized for? Is that really worth complicating
> the language? 🤔
> >
> >
> > I don't know why that decision was made. I do believe there are some
> less obvious cases, where you at least have to add special casing in the
> implementation (e.g. make([]T, x) would have to check at runtime if x is
> 0). But I agree that it would probably be okay to change the spec here.
>
> Zero sized values are useful in Go, because they can have methods and
> they can be stored in interfaces. But if the addresses of zero-sized
> values must be distinct, then although zero-sized values appear to
> have zero size they must in fact be implemented as taking up one byte.
> For example, given `struct { a, b struct{} }`, the addresses of `a`
> and `b` must be distinct, so that struct is actually two bytes. So,
> sure, we could change it. But there are surprising results either
> way.
>
> (Historically this was introduced for https://go.dev/issue/2620.)
>
> Ian
>
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