diff --git a/content/posts/operating-systems/deepin20.9.md b/content/posts/operating-systems/deepin20.9.md
index b46ffc41..793d3b9c 100644
--- a/content/posts/operating-systems/deepin20.9.md
+++ b/content/posts/operating-systems/deepin20.9.md
@@ -77,6 +77,10 @@ repost:
- **Vim**
- **VSCode Great Icons** 文件图标主题
+{{< admonition question >}}
+rust5-analyzer 插件可能会因为新版本要求 glibc 2.29 而导致启动失败，请参考这个 [issue](https://github.com/rust-lang/rust-analyzer/issues/11558) 来解决。
+{{< /admonition >}}
+
## 终端和 Vim
新手教学文档:
diff --git a/content/posts/riscv/openeuler-riscv-qemu-mugen.md b/content/posts/operating-systems/openeuler-riscv-qemu.md
similarity index 96%
rename from content/posts/riscv/openeuler-riscv-qemu-mugen.md
rename to content/posts/operating-systems/openeuler-riscv-qemu.md
index 86816e7e..0f17cff8 100644
--- a/content/posts/riscv/openeuler-riscv-qemu-mugen.md
+++ b/content/posts/operating-systems/openeuler-riscv-qemu.md
@@ -1,5 +1,5 @@
---
-title: "openEuler RISC-V 系统: QEMU 仿真和 Mugen 测试框架"
+title: "openEuler RISC-V 系统: QEMU 仿真"
subtitle:
date: 2024-03-07T14:48:21+08:00
# draft: true
@@ -19,6 +19,7 @@ tags:
- openEuler
- QEMU
- Mugen
+ - Neofetch
categories:
- RISC-V
- Operating Systems
@@ -292,6 +293,19 @@ $ echo $?
我个人比较期待 RISC-V 配合 nommu 在嵌入式这类低功耗领域的发展，同时也对 [RISC-V Hypervisor Extension](https://riscv.org/wp-content/uploads/2017/12/Tue0942-riscv-hypervisor-waterman.pdf) 在虚拟化方面的发展感兴趣。
+## Neofetch
+
+根据 [neofetch wiki](https://github.com/dylanaraps/neofetch/wiki/Installation#latest-git-master-bleeding-edge) 从 git 拉取最新数据进行构建:
+
+```bash
+$ git clone https://github.com/dylanaraps/neofetch
+$ cd neofetch
+$ make install
+$ neofetch
+```
+
+{{< image src="/images/oerv/openEuler-RISC-V-neofetch.png" >}}
+
## References
- openEuler RISC-V: [通过 QEMU 仿真 RISC-V 环境并启动 OpenEuler RISC-V 系统](https://github.com/openeuler-mirror/RISC-V/blob/master/doc/tutorials/vm-qemu-oErv.md)
diff --git a/content/posts/rust/subtying-and-variance.md b/content/posts/rust/subtying-and-variance.md
index ffbc0943..745a425d 100644
--- a/content/posts/rust/subtying-and-variance.md
+++ b/content/posts/rust/subtying-and-variance.md
@@ -55,6 +55,38 @@ repost:
- cplusplus: [strtok](https://cplusplus.com/reference/cstring/strtok/)
- cppreference: [strtok](https://en.cppreference.com/w/cpp/string/byte/strtok)
+### shortening lifetimes
+
+影片大概 19 分时给出了为何 cargo test 失败的推导，个人觉得非常巧妙
+
+```rs
+pub fn strtok<'a>(s: &'a mut &'a str, delimiter: char) { ... }
+
+let mut x = "hello world";
+strtok(&mut x, ' ');
+```
+
+为了更直观地表示和函数 `strtok` 的返回值 lifetime 无关，这里将返回值先去掉了。在调用 `strtok` 时，编译器对于参数 `s` 的 lifetime 推导如下:
+
+```
+&'a mut &'a str
+& mut x
+
+&'a mut &'a str
+& mut &'static str
+
+&'a mut &'static str
+& mut &'static str
+
+&'static mut &'static str
+& mut &'static str
+
+&'static mut &'static str
+&'static mut &'static str
+```
+
+所以 `strtok` 在接收参数 `s` 后 (通过传入 `&mut x`)，会推导其 lifetime 为 static，这就会导致后面使用 `x` 的不可变引用 (`&x`) 时发生冲突。
+
## Documentations
这里列举视频中一些概念相关的 documentation
diff --git a/docs/404.html b/docs/404.html
index d2752cb0..1ee4cf08 100644
--- a/docs/404.html
+++ b/docs/404.html
@@ -25,7 +25,7 @@
