The SAD trait proc macro implicitly requires outer context to have imported several symbols

[vdods]

#[derive(Clone, Debug, said::sad::SAD, serde::Deserialize, serde::Serialize)]
pub struct Fancy {
    thing: String,
    #[said]
    id_o: Option<said::SelfAddressingIdentifier>,
}

Produces the errors (abbreviated for clarity) in the invocation of the proc macro:

error: cannot find derive macro `Serialize` in this scope
failed to resolve: use of undeclared type `SerializationFormats`
cannot find trait `SAD` in this scope

This is worked-around by importing those symbols:

use said::sad::{SerializationFormats, SAD};
use serde::Serialize;

But a better solution would be for the SAD trait proc macro to fully qualify them internally so that it doesn't depend on the user to have those symbols imported.