{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let expr = self.arena.alloc(self.lower_expr_mut(expr));
    fn lower_expr_await(&mut self, await_kw_span: Span, expr: &Expr) -> hir::ExprKind<'hir> {
        self.make_lowered_await(await_kw_span, expr, FutureKind::Future)