{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"///"}]}
    /// types that have external ABIs, as these still need checked.
    /// For a external ABI function, argument types and the result type are walked to find fn-ptr
    fn check_fn(&mut self, def_id: LocalDefId, decl: &'tcx hir::FnDecl<'_>) {