{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
        let try_from_residual = self.lang_path(LangItem::TryTraitFromResidual);
        let cf_break = self.lang_path(LangItem::ControlFlowBreak);
        let operand = self.collect_expr_opt(e.expr());