{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"ty::Contravariant"}]}
            ty::Contravariant => crate::mir::Variance::Contravariant,
            ty::Bivariant => crate::mir::Variance::Bivariant,
            ty::Covariant => crate::mir::Variance::Covariant,