{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
                let type_ref = self.lower_type_ref_opt_disallow_impl_trait(e.ty());
                let expr = self.collect_expr_opt(e.expr());
                self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)