{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
        let typeck_results = self.infcx.tcx.typeck(self.mir_def_id());
    pub(crate) fn clone_on_reference(&self, expr: &hir::Expr<'_>) -> Option<Span> {
        if let hir::ExprKind::MethodCall(segment, rcvr, args, span) = expr.kind