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; ?
Oh, found: "An empty enum body (For example enum E;) signifies an opaque enum - the enum members are unknown."
But what this "unknown" does mean? How "unknown" differs from "none" in this context?
The specification is unclear. It does not define the meaning of unknown. I will submit a bug report.
