[Rust]Rustlingsで学ぼう（諸々とintro）

sudo apt install git-all

curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

Start-BitsTransfer -Source https://raw.githubusercontent.com/rust-lang/rustlings/main/install.ps1 -Destination $env:TMP/install_rustlings.ps1; Unblock-File $env:TMP/install_rustlings.ps1; Invoke-Expression $env:TMP/install_rustlings.ps1

All done! Run 'rustlings' to get started.

./rustlings

rustup update

rustlings -V

rm -rf rustlings

cargo uninstall rustlings

Rustlings is a collection of small exercises to get you used to writing and reading Rust code

Usage: rustlings [OPTIONS] [COMMAND]

Commands:
  verify  Verify all exercises according to the recommended order
  watch   Rerun `verify` when files were edited
  run     Run/Test a single exercise
  reset   Reset a single exercise using "git stash -- <filename>"
  hint    Return a hint for the given exercise
  list    List the exercises available in Rustlings
  lsp     Enable rust-analyzer for exercises
  help    Print this message or the help of the given subcommand(s)

Options:
      --nocapture  Show outputs from the test exercises
  -h, --help       Print help
  -V, --version    Print version

rustlings watch

====================
Hello and
       welcome to...                      
                 _   _ _                  
  _ __ _   _ ___| |_| (_)_ __   __ _ ___  
 | '__| | | / __| __| | | '_ \ / _` / __| 
 | |  | |_| \__ \ |_| | | | | | (_| \__ \ 
 |_|   \__,_|___/\__|_|_|_| |_|\__, |___/ 
                               |___/      

This exercise compiles successfully. The remaining exercises contain a compiler
or logic error. The central concept behind Rustlings is to fix these errors and
solve the exercises. Good luck!

The source for this exercise is in `exercises/intro/intro1.rs`. Have a look!
Going forward, the source of the exercises will always be in the success/failure output.

If you want to use rust-analyzer, Rust's LSP implementation, make sure your editor is set
up, and then run `rustlings lsp` before continuing.

====================

You can keep working on this exercise,
or jump into the next one by removing the `I AM NOT DONE` comment:

14 |  // hint.
15 |  
16 |  // I AM NOT DONE
17 |  
18 |  fn main() {
Welcome to watch mode! You can type 'help' to get an overview of the commands you can use here.

⚠️  Compiling of exercises/intro/intro2.rs failed! Please try again. Here's the output:
error: 1 positional argument in format string, but no arguments were given
  --> exercises/intro/intro2.rs:11:21
   |
11 |     println!("Hello {}!");
   |                     ^^

error: aborting due to 1 previous error

println!("Hello world!");

println!("Hello {}!", "world");

let str = "world";
println!("Hello {}!", str);