{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"crate::variance::Variance::Covariant"}]}
            crate::variance::Variance::Covariant => chalk_ir::Variance::Covariant,
        db.variances_of(adt_id.into()).as_deref().unwrap_or_default().iter().map(|v| match v {
            crate::variance::Variance::Invariant => chalk_ir::Variance::Invariant,