类似之前 用仓颉试写猜数字例程，尤其想看看反馈方面如报错等的表现。

刚安装vsc插件，弹窗报错5分钟内崩溃三次，再看还有个弹窗说需要安装月兔工具链。按 官网 在vsc内安装后，仍弹窗报错5分钟内崩溃三次，暂时不管。

输入 mbt 可以插入代码块，看似插件起效了。

let a = 1
 let b = 2
  println(a)

点 Fmt, 报”Client is not running”

在终端运行 % source ~/.zshrc 后，可运行 moon 命令，再重启插件，点 Fmt 似乎不报错了，但也没看到格式化代码的效果。

% moon test
error: could not find a moon.mod.json file in the source directory or its ancestors

插入测试代码块：

test {
  
}

空代码块点 Test：

 *  正在执行任务: moon test '2025-06-13-用月兔语言编写猜数字.mbt.md' -i 0 

zsh:1: command not found: moon

 *  终端进程“/bin/zsh '-l', '-c', 'moon test '2025-06-13-用月兔语言编写猜数字.mbt.md' -i 0'”启动失败(退出代码: 127)。 
 *  终端将被任务重用，按任意键关闭。

加了两行：

test {
  let a = 1
  inspect(a, content="1")
}

inspect有代码补全，还是无效。

感觉是工具链路径问题，于是重启vsc，这下mbt test代码块的 Test 有效了：

 *  正在执行任务: moon test '2025-06-13-用月兔语言编写猜数字.mbt.md' -i 0 

failed: moonc build-package -error-format json /Users/xuanwu/work/文章/team_website/_posts/target/wasm-gc/debug/test/single/__generated_driver_for_blackbox_test.mbt -o /Users/xuanwu/work/文章/team_website/_posts/target/wasm-gc/debug/test/single/single.blackbox_test.core -pkg moon/test/single_blackbox_test -is-main -std-path /Users/xuanwu/.moon/lib/core/target/wasm-gc/release/bundle -i /Users/xuanwu/work/文章/team_website/_posts/target/wasm-gc/debug/test/single/single.mi:single -pkg-sources moon/test/single_blackbox_test:/Users/xuanwu/work/文章/team_website/_posts -target wasm-gc -g -O0 -source-map -blackbox-test -no-mi -patch-file /Users/xuanwu/work/文章/team_website/_posts/target/wasm-gc/debug/test/single/__moonbit_internal_md_test.json -test-mode
Warning: [0002]
   ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:8:5]
   │
 8 │ let a = 1
   │     ┬  
   │     ╰── Warning: Unused toplevel variable 'a'. Note if the body contains side effect, it will not happen. Use `fn init { .. }` to wrap the effect.
───╯
Warning: [0019]
   ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:9:2]
   │
 9 │  let b = 2
   │  ────┬────  
   │      ╰────── Warning: Toplevel declaration is not left aligned.
───╯
Warning: [0002]
   ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:9:6]
   │
 9 │  let b = 2
   │      ┬  
   │      ╰── Warning: Unused toplevel variable 'b'. Note if the body contains side effect, it will not happen. Use `fn init { .. }` to wrap the effect.
───╯
Warning: [0019]
    ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:10:3]
    │
 10 │   println(a)
    │   ─────┬────  
    │        ╰────── Warning: Toplevel declaration is not left aligned.
────╯
Error: [3002]
    ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:10:3]
    │
 10 │   println(a)
    │   ───┬───  
    │      ╰───── Parse error, unexpected token `identifier`, you may expect `pub` or `priv` or `type` or `suberror` or `typealias` or `async` or `fn` or `fnalias` or `struct` or `enum` or `let` or `const` or `extern` or `test` or `impl` or `trait` or `traitalias`.
────╯
error: failed when testing

报警里有缩进未对齐信息，但是代码块的 Fmt 还是无效。

于是手动改成对齐：

let a = 1
let b = 2
println(a)

点 Test 结果报错：

Error: [4051]
     ╭─[/Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:102:5]
     │
 102 │ let b = 2
     │     ┬  
     │     ╰── The toplevel identifier b is declared twice: it was previously defined at /Users/xuanwu/work/文章/team_website/_posts/2025-06-13-用月兔语言编写猜数字.mbt.md:9:6.

看起来，两个代码块的同名变量会被认为是重复定义。这在开发时也许合理，但技术文档常会有这种情况。不知如何取消。更重要的是还不知如何单独运行某个代码块。

其他日志

 *  正在执行任务: curl -fsSL https://cli.moonbitlang.com/install/unix.sh | bash -s '0.1.20250612+600461c34' 

Downloading moonbit ...
######################################################################## 100.0%
Downloading core ...
######################################################################## 100.0%
Bundling core ...
Finished. moon: ran 57 tasks, now up to date
Finished. moon: ran 57 tasks, now up to date
Finished. moon: ran 57 tasks, now up to date
Finished. moon: ran 57 tasks, now up to date
moonbit was installed successfully to ~/.moon 
To verify the downloaded binaries, check https://www.moonbitlang.com/download#verifying-binaries for instructions.
To know how to add shell completions, run 'moon shell-completion --help'
Added "~/.moon/bin" to $PATH in "~/.zshrc" 
To get started, run: 
  source ~/.zshrc 
  moon help 
 *  按任意键关闭终端。