Mysterious circe macro fail

[pshirshov]

The following snippet makes circe macro fail on decoder derivation

id IdentityId {
    _: uid
}

adt AliasId {
    IdentityId
}

data AliasIdLink {
    sid: AliasId
    primary: set[IdentityId]
}

data IdentitySecret {
    sharedSecret: str
}


mixin IdentitySecurity {
    keys: map[IdentityId, IdentitySecret]
    history: set[AliasIdLink]
}```