Meta-programming detecting anonymous unions inside structs.

[TheFlyingFiddle via Digitalmars-d-learn]

On Friday, 21 October 2016 at 07:56:27 UTC, rikki cattermole 
wrote:
> You're gonna have to use UDA's for that.

Yes, to do the serialization you're right.

But my usecase for this is for error reporting. Basically any 
struct that contains unions without serialization instructions 
cannot be serialized and I want to make such structures errors.

So when I try to serialize the example struct Foo. It should 
assert with something along the lines of:

"Don't know how to serialize overlapping fields: "Foo.integer", 
"Foo.floating" and "Foo.array".