{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"CallableDefId::FunctionId(deref_fn).to_chalk(self.db),"}]}
                CallableDefId::FunctionId(deref_fn).to_chalk(self.db),
            TyKind::FnDef(
                Substitution::from1(Interner, source_ty),