Merge pull request #928 from zongzi531/hotfix/deque

fix: typo shell symbol in cargo script and etc

src/advance/macro.md

@@ -432,6 +432,7 @@ fn impl_hello_macro(ast: &syn::DeriveInput) -> TokenStream {
 
 ```shell
 $ cargo run
+
      Running `target/debug/hello_macro`
 Hello, Macro! My name is Sunfei!
 Hello, Macro! My name is Sunface!

src/appendix/rust-versions/1.60.md

@@ -11,7 +11,7 @@ $ rustup update stable
 ## 基于源码的代码覆盖
 rustc 新增了基于 LLVM 的代码覆盖率测量，想要测试的同学可以通过以下方式重新构建你的项目:
 ```shell
-RUSTFLAGS="-C instrument-coverage" cargo build
+$ RUSTFLAGS="-C instrument-coverage" cargo build
 ```
 
 运行新生成的可执行文件将在当前目录下产生一个 `default.profraw` 文件( 路径和文件名可以通过环境变量进行[覆盖](https://doc.rust-lang.org/stable/rustc/instrument-coverage.html#running-the-instrumented-binary-to-generate-raw-coverage-profiling-data) )。
@@ -43,7 +43,7 @@ $(rustc --print sysroot)/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov show
 ## 查看 Cargo 构建耗时
 新版本中，以下命令已经可以正常使用了:
 ```shell
-$  cargo build --timings
+$ cargo build --timings
    Compiling hello-world v0.1.0 (hello-world)
       Timing report saved to target/cargo-timings/cargo-timing-20220318T174818Z.html
     Finished dev [unoptimized + debuginfo] target(s) in 0.98s

src/cargo/reference/profiles.md

@@ -46,7 +46,7 @@ lto = true
 然后在构建时使用 `--profile` 来指定想要选择的自定义 profile ：
 
 ```shell
-cargo build --profile release-lto
+$ cargo build --profile release-lto
 ```
 
 与默认的 profile 相同，自定义 profile 的编译结果也存放在 [`target/`](https://course.rs/cargo/guide/build-cache.html) 下的同名目录中，例如 `--profile release-lto` 的输出结果存储在 `target/release-lto` 中。

src/test/write-tests.md

@@ -501,7 +501,8 @@ test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; fini
 其中还有一点值得注意，那就是测试模块 `tests` 的名称也出现在了最终结果中：`tests::add_two_and_two`，这是非常贴心的细节，也意味着我们可以通过**模块名称来过滤测试**：
 
 ```shell
-cargo test tests
+$ cargo test tests
+
 running 3 tests
 test tests::add_two_and_two ... ok
 test tests::add_three_and_two ... ok

src/too-many-lists/advanced-lists/double-singly.md

@@ -189,7 +189,7 @@ mod test {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/advanced-lists/stack-allocated.md

@@ -85,7 +85,7 @@ mod test {
 }
 ```
 ```shell
-> cargo test
+$ cargo test
 
 running 18 tests
 test fifth::test::into_iter ... ok
@@ -149,7 +149,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
 error[E0521]: borrowed data escapes outside of closure
   --> src\silly2.rs:47:32
@@ -194,7 +194,7 @@ fn elegance() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
 error[E0521]: borrowed data escapes outside of closure
   --> src\silly2.rs:46:17
@@ -296,7 +296,7 @@ fn cell() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
 running 19 tests
 test fifth::test::into_iter ... ok

src/too-many-lists/bad-stack/basic-operations.md

@@ -170,7 +170,7 @@ pub fn pop(&mut self) -> Option<i32> {
 
 以上代码果不其然又报错了:
 ```shell
-> cargo build
+$ cargo build
 
 error[E0507]: cannot move out of borrowed content
   --> src/first.rs:28:15

src/too-many-lists/bad-stack/final-code.md

@@ -43,7 +43,7 @@ mod test {
 
 在 `src/first.rs` 中添加以上测试模块，然后使用 `cargo test` 运行相关的测试用例：
 ```shell
-> cargo test
+$ cargo test
 
 error[E0433]: failed to resolve: use of undeclared type or module `List`
   --> src/first.rs:43:24
@@ -150,7 +150,7 @@ impl Drop for List {
 
 测试下上面的实现以及之前的长链表例子:
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/bad-stack/layout.md

@@ -48,7 +48,7 @@ pub enum List {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
    Finished dev [unoptimized + debuginfo] target(s) in 0.22s
 ```

src/too-many-lists/deque/iterator.md

@@ -51,7 +51,7 @@ fn into_iter() {
 ```
 
 ```shell
-cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 
@@ -84,7 +84,7 @@ impl<T> List<T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 ```
 
 迄今为止一切运行正常，接下来的 `next` 实现起来会有些麻烦:
@@ -101,7 +101,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-cargo build
+$ cargo build
 
 error[E0521]: borrowed data escapes outside of closure
    --> src/fourth.rs:155:13
@@ -157,7 +157,8 @@ fn next(&mut self) -> Option<Self::Item> {
 ```
 
 ```shell
-cargo build
+$ cargo build
+
    Compiling lists v0.1.0 (/Users/ABeingessner/dev/temp/lists)
 error[E0521]: borrowed data escapes outside of closure
    --> src/fourth.rs:159:13

src/too-many-lists/deque/layout.md

@@ -57,7 +57,7 @@ impl<T> List<T> {
 
 除此之外，我们还需要处理一些关于空链表的边界问题：对于绝大部分操作而言，可能只需要使用 `head` 或 `tail` 指针，但是对于空链表，则需要同时使用它们。
 
-一个验证方法 `methods` 是否有效的办法就是看它是否能保持不变性, 每个节点都应该有两个指针指向它: 中间的节点被它前后的节点所指向，而头部的端节点除了被它后面的节点所指向外，还会被链表本身所指向，尾部的端节点亦是如此。
+一个验证方法 `methods` 是否有效的办法就是看它是否能保持不变性, 每个节点都应该有两个指针指向它: 中间的节点被它前后的节点所指向，而头部的节点除了被它后面的节点所指向外，还会被链表本身所指向，尾部的节点亦是如此。
 
 ```rust
 pub fn push_front(&mut self, elem: T) {
@@ -79,7 +79,7 @@ pub fn push_front(&mut self, elem: T) {
 ```
 
 ```rust
-cargo build
+> cargo build
 
 error[E0609]: no field `prev` on type `std::rc::Rc<std::cell::RefCell<fourth::Node<T>>>`
   --> src/fourth.rs:39:26
@@ -115,7 +115,7 @@ pub fn push_front(&mut self, elem: T) {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 warning: field is never used: `elem`
   --> src/fourth.rs:12:5
@@ -152,7 +152,7 @@ pub fn pop_front(&mut self) -> Option<T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0609]: no field `elem` on type `std::rc::Rc<std::cell::RefCell<fourth::Node<T>>>`
   --> src/fourth.rs:64:22
@@ -180,7 +180,7 @@ pub fn pop_front(&mut self) -> Option<T> {
 ```
 
 ```shell
-cargo build
+$ cargo build
 
 error[E0507]: cannot move out of borrowed content
   --> src/fourth.rs:64:13
@@ -203,7 +203,7 @@ old_head.into_inner().elem
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0507]: cannot move out of an `Rc`
   --> src/fourth.rs:64:13
@@ -222,7 +222,7 @@ Rc::try_unwrap(old_head).unwrap().into_inner().elem
 `Rc::try_unwrap` 返回一个 `Result`，由于我们不关心 `Err` 的情况( 如果代码合理，这里不会是 `Err` )，直接使用 `unwrap` 即可。
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0599]: no method named `unwrap` found for type `std::result::Result<std::cell::RefCell<fourth::Node<T>>, std::rc::Rc<std::cell::RefCell<fourth::Node<T>>>>` in the current scope
   --> src/fourth.rs:64:38
@@ -242,7 +242,7 @@ Rc::try_unwrap(old_head).ok().unwrap().into_inner().elem
 ```
 
 ```shell
-cargo build
+$ cargo build
 ```
 
 终于成功的运行了，下面依然是惯例 - 写几个测试用例 :
@@ -283,7 +283,7 @@ mod test {
 ```
 
 ```shell
-cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 
@@ -302,7 +302,7 @@ test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured
 ```
 
 ## Drop
-在[循环引用章节]()，我们介绍过 `Rc` 最怕的就是引用形成循环，而双向链表恰恰如此。因此，当使用默认的实现来 `drop` 我们的链表时，两个端节点会将各自的引用计数减少到 1， 然后就不会继续减少，最终造成内存泄漏。
+在[循环引用章节]()，我们介绍过 `Rc` 最怕的就是引用形成循环，而双向链表恰恰如此。因此，当使用默认的实现来 `drop` 我们的链表时，两个节点会将各自的引用计数减少到 1， 然后就不会继续减少，最终造成内存泄漏。
 
 所以，这里最好的实现就是将每个节点 `pop` 出去，直到获得 `None`:
 ```rust

src/too-many-lists/deque/peek.md

@@ -20,7 +20,7 @@ pub fn peek_front(&self) -> Option<&T> {
 ```
 
 ```shell
-cargo build
+$ cargo build
 
 error[E0515]: cannot return value referencing temporary value
   --> src/fourth.rs:66:13
@@ -58,7 +58,7 @@ pub fn peek_front(&self) -> Option<Ref<T>> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0308]: mismatched types
   --> src/fourth.rs:64:9
@@ -94,7 +94,7 @@ pub fn peek_front(&self) -> Option<Ref<T>> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 ```
 
 Gooood! 本章节的编译错误可以说是多个链表中最难解决的之一，依然被我们成功搞定了！
@@ -114,7 +114,7 @@ fn peek() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/deque/symmetric.md

@@ -139,7 +139,7 @@ fn peek() {
 什么？你问我这里的测试用例全吗？只能说如果测试全部的组合情况，这一章节会被撑爆。至于现在，能不出错就谢天谢地了 :(
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/do-we-need-it.md

@@ -18,8 +18,8 @@
 #### 创建一个项目
 在开始前，先来创建一个项目专门用于链表学习：
 ```shell
-> cargo new --lib lists
-> cd lists
+$ cargo new --lib lists
+$ cd lists
 ```
 
 之后，我们会将每个一个链表放入单独的文件中，需要注意的是我们会尽量模拟真实的 Rust 开发场景：你写了一段代码，然后编译器开始跳出试图教你做事，只有这样才能真正学会 Rust，温室环境是无法培养出强大的 Rustacean 的。

src/too-many-lists/ok-stack/iter.md

@@ -55,7 +55,7 @@ fn into_iter() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 
@@ -97,7 +97,7 @@ impl<T> Iterator for Iter<T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0106]: missing lifetime specifier
   --> src/second.rs:72:18
@@ -122,7 +122,7 @@ pub struct Iter<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0106]: missing lifetime specifier
   --> src/second.rs:83:22
@@ -163,7 +163,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error: expected `:`, found `node`
   --> src/second.rs:77:47
@@ -217,7 +217,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 
 现在，我们也许可以自信的编译下试试了：
 ```shell
-> cargo build
+$ cargo build
 
 error[E0308]: mismatched types
   --> src/second.rs:77:22
@@ -260,7 +260,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
    Compiling lists v0.1.0 (/Users/ABeingessner/dev/temp/lists)
 error[E0515]: cannot return reference to local data `*node`
@@ -315,7 +315,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
    Compiling lists v0.1.0 (/Users/ABeingessner/dev/temp/lists)
 error[E0308]: mismatched types
@@ -364,7 +364,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 ```
 
 🎉 🎉 🎉
@@ -402,7 +402,7 @@ fn iter() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/ok-stack/itermut.md

@@ -57,7 +57,7 @@ impl<'a, T> Iterator for IterMut<'a, T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0596]: cannot borrow `self.head` as mutable, as it is behind a `&` reference
   --> src/second.rs:95:25
@@ -96,7 +96,7 @@ fn next(&mut self) -> Option<Self::Item> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 ```
 
 老规矩，来测试下:
@@ -114,7 +114,7 @@ fn iter_mut() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/ok-stack/peek.md

@@ -12,7 +12,7 @@ pub fn peek(&self) -> Option<&T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0515]: cannot return reference to local data `node.elem`
   --> src/second.rs:37:13
@@ -46,7 +46,7 @@ pub fn peek(&self) -> Option<&T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
     Finished dev [unoptimized + debuginfo] target(s) in 0.32s
 ```
@@ -81,7 +81,7 @@ fn peek() {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
 error[E0384]: cannot assign twice to immutable variable `value`
    --> src/second.rs:100:13
@@ -124,7 +124,7 @@ fn peek() {
 这次我们直接匹配出来可变引用 `value`，然后对其修改即可。
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/ok-stack/type-optimizing.md

@@ -126,7 +126,7 @@ pub fn pop(&mut self) -> Option<i32> {
 
 不错，看上去简洁了很多，下面运行下测试代码确保链表依然可以正常运行(这就是 TDD 的优点！) :
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 
@@ -188,7 +188,7 @@ impl<T> Drop for List<T> {
 大家在修改了 `List` 的定义后，别忘了将 `impl` 中的 `List` 修改为 `List<T>`，切记**泛型参数也是类型定义的一部分**。
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/persistent-stack/drop-arc.md

@@ -49,7 +49,8 @@ list3 -> X ---+
 
 测试下新的代码:
 ```shell
-cargo test
+$ cargo test
+
    Compiling lists v0.1.0 (/Users/ABeingessner/dev/too-many-lists/lists)
     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
      Running /Users/ABeingessner/dev/too-many-lists/lists/target/debug/deps/lists-86544f1d97438f1f

src/too-many-lists/persistent-stack/layout.md

@@ -74,7 +74,7 @@ pub fn prepend(&self, elem: T) -> List<T> {
 
 运行下试试：
 ```shell
-> cargo build
+$ cargo build
 
 warning: field is never used: `elem`
   --> src/third.rs:10:5
@@ -101,7 +101,7 @@ pub fn tail(&self) -> List<T> {
 ```
 
 ```shell
-cargo build
+$ cargo build
 
 error[E0308]: mismatched types
   --> src/third.rs:27:22
@@ -159,7 +159,7 @@ mod test {
 ```
 
 ```shell
-> cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 
@@ -211,7 +211,7 @@ fn iter() {
 ```
 
 ```shell
-cargo test
+$ cargo test
 
      Running target/debug/lists-5c71138492ad4b4a
 

src/too-many-lists/unsafe-queue/basics.md

@@ -13,7 +13,7 @@ impl<T> List<T> {
 
 但是我们不再在 `tail` 中使用 `Option`:
 ```shell
-> cargo build
+$ cargo build
 
 error[E0308]: mismatched types
   --> src/fifth.rs:15:34
@@ -73,7 +73,7 @@ pub fn push(&mut self, elem: T) {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0609]: no field `next` on type `*mut fifth::Node<T>`
   --> src/fifth.rs:31:23
@@ -91,7 +91,7 @@ error[E0609]: no field `next` on type `*mut fifth::Node<T>`
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0609]: no field `next` on type `*mut fifth::Node<T>`
   --> src/fifth.rs:31:23
@@ -109,7 +109,7 @@ error[E0609]: no field `next` on type `*mut fifth::Node<T>`
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0133]: dereference of raw pointer is unsafe and requires 
               unsafe function or block
@@ -149,7 +149,7 @@ pub fn push(&mut self, elem: T) {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 warning: field is never used: `elem`
   --> src/fifth.rs:11:5
    |
@@ -225,7 +225,7 @@ mod test {
 摊牌了，我们偷懒了，这些测试就是从之前的栈链表赋值过来的，但是依然做了些改变，例如在末尾增加了几个步骤以确保在 `pop` 中不会发生尾指针损坏( tail-pointer corruption  )的情况。
 
 ```shell
-cargo test
+$ cargo test
 
 running 12 tests
 test fifth::test::basics ... ok

src/too-many-lists/unsafe-queue/layout.md

@@ -82,7 +82,7 @@ impl<T> List<T> {
 
 但是如果你担心不再能看到错误，那就纯属多余了:
 ```shell
-> cargo build
+$ cargo build
 
 error[E0382]: use of moved value: `new_tail`
   --> src/fifth.rs:38:38
@@ -139,7 +139,7 @@ impl<T> List<T> {
 ```
 
 ```shell
-> cargo build
+$ cargo build
 
 error[E0106]: missing lifetime specifier
  --> src/fifth.rs:3:18
@@ -190,7 +190,7 @@ impl<'a, T> List<'a, T> {
 ```
 
 ```shell
-cargo build
+$ cargo build
 
 error[E0495]: cannot infer an appropriate lifetime for autoref due to conflicting requirements
   --> src/fifth.rs:35:27
@@ -235,7 +235,7 @@ pub fn push(&'a mut self, elem: T) {
 
 当当当当，成功通过编译:
 ```shell
-cargo build
+$ cargo build
 
 warning: field is never used: `elem`
  --> src/fifth.rs:9:5
@@ -297,7 +297,7 @@ mod test {
 }
 ```
 ```shell
-cargo test
+$ cargo test
 
 error[E0499]: cannot borrow `list` as mutable more than once at a time
   --> src/fifth.rs:68:9

src/too-many-lists/unsafe-queue/layout2.md

@@ -196,7 +196,7 @@ mod test {
 ```
 
 ```shell
-cargo test
+$ cargo test
 
 running 12 tests
 test fifth::test::basics ... ok

src/too-many-lists/unsafe-queue/miri.md

@@ -36,7 +36,7 @@ info: installing component 'miri'
 > + 是一种临时性的规则运用，如果你不想每次都使用 `+nightly-2022-01-21`，可以使用 [`rustup override set`](https://course.rs/appendix/rust-version.html#rustup-和-rust-nightly-的职责) 命令对当前项目的 Rust 版本进行覆盖
 
 ```shell
-> cargo +nightly-2022-01-21 miri test
+$ cargo +nightly-2022-01-21 miri test
 
 I will run `"cargo.exe" "install" "xargo"` to install
 a recent enough xargo. Proceed? [Y/n]
@@ -146,7 +146,7 @@ UB 检测是必须的，因为它发生在运行时，因此很难发现，如
 
 总之，`miri` 的使用很简单:
 ```shell
-> cargo +nightly-2022-01-21 miri test
+$ cargo +nightly-2022-01-21 miri test
 ```
 
 下面来看看具体的错误：

src/too-many-lists/unsafe-queue/testing-stacked-borrow.md

@@ -50,7 +50,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
    Compiling miri-sandbox v0.1.0
     Finished dev [unoptimized + debuginfo] target(s) in 0.71s
      Running `target\debug\miri-sandbox.exe`
@@ -101,7 +102,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 22
 ```
 
@@ -141,7 +143,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 20
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -172,7 +175,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 [3, 3, 0, 0, 0, 0, 0, 0, 0, 0]
 ```
 
@@ -206,7 +210,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 [6, 0, 0, 0, 0, 0, 0, 0, 0, 0]
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -238,7 +243,7 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
 [20, 0, 0, 0, 0, 0, 0, 0, 0, 0]
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -310,7 +315,7 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
 [10, 12, 0, 0, 0, 0, 0, 0, 0, 0]
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -353,7 +358,7 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
 [8, 12, 4, 6, 8, 10, 12, 14, 16, 18]
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -393,7 +398,7 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
 
 warning: unnecessary `unsafe` block
  --> src\main.rs:6:1
@@ -436,7 +441,7 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
 
 error[E0606]: casting `&i32` as `*mut i32` is invalid
   --> src/main.rs:11:20
@@ -454,7 +459,7 @@ let ptr4 = sref3 as *const i32 as *mut i32;
 如上，先将不可变引用转换成不可变的裸指针，然后再转换成可变的裸指针。
 
 ```shell
-cargo run
+$ cargo run
 
 14
 17
@@ -502,7 +507,8 @@ unsafe {
 可以看到，我们其实可以创建一个可变的裸指针，只要不去使用写操作，而是只使用读操作。
 
 ```shell
-cargo run
+$ cargo run
+
 10
 10
 13
@@ -534,7 +540,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 12
 13
 
@@ -578,7 +585,8 @@ unsafe {
 地狱一般的代码，就等着 miri 来优化你吧。
 
 ```shell
-cargo run
+$ cargo run
+
 16
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -624,7 +632,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 12
 16
 
@@ -666,7 +675,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 13
 16
 
@@ -694,7 +704,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 21
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run
@@ -726,7 +737,8 @@ unsafe {
 ```
 
 ```shell
-cargo run
+$ cargo run
+
 21
 
 MIRIFLAGS="-Zmiri-tag-raw-pointers" cargo +nightly-2022-01-21 miri run