{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"crate::variance::Variance::Covariant"}]}
                crate::variance::Variance::Covariant => chalk_ir::Variance::Covariant,
            .map(|v| match v {
                crate::variance::Variance::Invariant => chalk_ir::Variance::Invariant,