Re: `enum x;` - what is it?

[FeepingCreature via Digitalmars-d-learn]

On Wednesday, 19 August 2020 at 14:06:16 UTC, Victor Porton wrote:

This declaration does compile:

enum x;

But what is it? Is it an equivalent of

enum x { }

?

What in the specification allows this looking a nonsense

enum x;

?

It's an enum type whose members we don't know.

So we can't declare "x var;" but we can declare "x* var;".

It's the enum version of "struct SomeExternCStruct;".