{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ty::Covariant"}]}
            ty::Covariant => crate::mir::Variance::Covariant,
            ty::Contravariant => crate::mir::Variance::Contravariant,
            ty::Invariant => crate::mir::Variance::Invariant,