{"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
        let suggest_deref_binop = |err: &mut Diag<'_>, rhs_ty: Ty<'tcx>| {
            if let Some(lhs_deref_ty) = self.deref_once_mutably_for_diagnostic(lhs_ty) {