{"ast_node_type":"function","tokens":[{"end":66,"kind":"keyword","start":0,"text":"fn"}]}
            fn check_generics(a: &'tcx rustc_hir::Generics<'tcx>);
            fn check_generic_param(a: &'tcx rustc_hir::GenericParam<'tcx>);
            fn check_poly_trait_ref(a: &'tcx rustc_hir::PolyTraitRef<'tcx>);