release: 5.5.1

fix: revert back to using relative paths
fix: add oranda-hide class to readme
2025-12-26 00:11:49 +02:00 · 2023-05-17 21:05:51 +02:00 · 2023-05-17 21:04:32 +02:00 · 2023-05-17 17:11:49 +02:00 · 2023-05-17 16:56:01 +02:00 · 2023-05-17 16:30:31 +02:00
43 changed files with 933 additions and 262 deletions
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -1839,6 +1839,285 @@
      "contributions": [
        "content"
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+      "avatar_url": "https://avatars.githubusercontent.com/u/46051506?v=4",
+      "profile": "https://github.com/Anush008",
+      "contributions": [
+        "doc"
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+    {
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+      "name": "Gleb Shevchenko",
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+      "profile": "https://github.com/shgew",
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+      "avatar_url": "https://avatars.githubusercontent.com/u/60408300?v=4",
+      "profile": "https://github.com/mdmundo",
+      "contributions": [
+        "infra"
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+      "avatar_url": "https://avatars.githubusercontent.com/u/301795?v=4",
+      "profile": "https://github.com/eroullit",
+      "contributions": [
+        "infra"
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--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,17 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2-linux",
+  "waitFor": "onCreateCommand",
+  "onCreateCommand": ".devcontainer/setup.sh",
+  "updateContentCommand": "cargo build",
+  "postCreateCommand": "",
+  "postAttachCommand": {
+    "server": "rustlings watch"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "rust-lang.rust-analyzer"
+      ]
+    }
+  }
+}
--- a/.devcontainer/setup.sh
+++ b/.devcontainer/setup.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+curl https://sh.rustup.rs -sSf | sh -s -- -y
+
+# Update current shell environment variables after install to find rustup
+. "$HOME/.cargo/env"
+rustup install stable
+bash install.sh
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,18 @@
+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: DavidAnson/markdownlint-cli2-action@v9
+        with:
+          globs: "exercises/**/*.md"
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,7 @@ rust-project.json
 !.vscode/extensions.json
 *.iml
 *.o
+public/
+
+# Local Netlify folder
+.netlify
--- a/.markdownlint.yml
+++ b/.markdownlint.yml
@@ -0,0 +1,2 @@
+# MD013/line-length Line length, Expected: 80
+MD013: false
--- a/.replit
+++ b/.replit
@@ -1,2 +0,0 @@
-language = "rust"
-run = "[ -x ~/.cargo/bin/rustlings ] && ~/.cargo/bin/rustlings watch || ./install.sh"
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -262,6 +262,43 @@ authors.
    </tr>
    <tr>
      <td align="center" valign="top" width="12.5%"><a href="https://grzegorz-zur.com/"><img src="https://avatars.githubusercontent.com/u/5297583?v=4?s=100" width="100px;" alt="Grzegorz Żur"/><br /><sub><b>Grzegorz Żur</b></sub></a><br /><a href="#content-grzegorz-zur" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/black-puppydog"><img src="https://avatars.githubusercontent.com/u/189241?v=4?s=100" width="100px;" alt="Daan Wynen"/><br /><sub><b>Daan Wynen</b></sub></a><br /><a href="#content-black-puppydog" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Anush008"><img src="https://avatars.githubusercontent.com/u/46051506?v=4?s=100" width="100px;" alt="Anush"/><br /><sub><b>Anush</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Anush008" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/shgew"><img src="https://avatars.githubusercontent.com/u/5584672?v=4?s=100" width="100px;" alt="Gleb Shevchenko"/><br /><sub><b>Gleb Shevchenko</b></sub></a><br /><a href="#content-shgew" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/mdmundo"><img src="https://avatars.githubusercontent.com/u/60408300?v=4?s=100" width="100px;" alt="Edmundo Paulino"/><br /><sub><b>Edmundo Paulino</b></sub></a><br /><a href="#infra-mdmundo" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/eroullit"><img src="https://avatars.githubusercontent.com/u/301795?v=4?s=100" width="100px;" alt="Emmanuel Roullit"/><br /><sub><b>Emmanuel Roullit</b></sub></a><br /><a href="#infra-eroullit" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://nidhalmessaoudi.herokuapp.com"><img src="https://avatars.githubusercontent.com/u/63377412?v=4?s=100" width="100px;" alt="Nidhal Messaoudi"/><br /><sub><b>Nidhal Messaoudi</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nidhalmessaoudi" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/MahdiBM"><img src="https://avatars.githubusercontent.com/u/54685446?v=4?s=100" width="100px;" alt="Mahdi Bahrami"/><br /><sub><b>Mahdi Bahrami</b></sub></a><br /><a href="#tool-MahdiBM" title="Tools">🔧</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Nagidal"><img src="https://avatars.githubusercontent.com/u/7075397?v=4?s=100" width="100px;" alt="Nagidal"/><br /><sub><b>Nagidal</b></sub></a><br /><a href="#content-Nagidal" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://adabrew.com"><img src="https://avatars.githubusercontent.com/u/25161597?v=4?s=100" width="100px;" alt="Adam Brewer"/><br /><sub><b>Adam Brewer</b></sub></a><br /><a href="#content-adamhb123" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/eugkhp"><img src="https://avatars.githubusercontent.com/u/25910599?v=4?s=100" width="100px;" alt="Eugene"/><br /><sub><b>Eugene</b></sub></a><br /><a href="#tool-eugkhp" title="Tools">🔧</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://social.linux.pizza/@navicore"><img src="https://avatars.githubusercontent.com/u/110999?v=4?s=100" width="100px;" alt="Ed Sweeney"/><br /><sub><b>Ed Sweeney</b></sub></a><br /><a href="#content-navicore" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/javihernant"><img src="https://avatars.githubusercontent.com/u/73640929?v=4?s=100" width="100px;" alt="javihernant"/><br /><sub><b>javihernant</b></sub></a><br /><a href="#content-javihernant" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/VegardMatthey"><img src="https://avatars.githubusercontent.com/u/59250656?v=4?s=100" width="100px;" alt="Vegard"/><br /><sub><b>Vegard</b></sub></a><br /><a href="#content-VegardMatthey" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/ryanwhitehouse"><img src="https://avatars.githubusercontent.com/u/13400784?v=4?s=100" width="100px;" alt="Ryan Whitehouse"/><br /><sub><b>Ryan Whitehouse</b></sub></a><br /><a href="#content-ryanwhitehouse" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/guoard"><img src="https://avatars.githubusercontent.com/u/65511355?v=4?s=100" width="100px;" alt="Ali Afsharzadeh"/><br /><sub><b>Ali Afsharzadeh</b></sub></a><br /><a href="#content-guoard" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://keogami.ml"><img src="https://avatars.githubusercontent.com/u/41939011?v=4?s=100" width="100px;" alt="Keogami"/><br /><sub><b>Keogami</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=keogami" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/ahresse"><img src="https://avatars.githubusercontent.com/u/28402488?v=4?s=100" width="100px;" alt="Alexandre Esse"/><br /><sub><b>Alexandre Esse</b></sub></a><br /><a href="#content-ahresse" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://resilient.tech"><img src="https://avatars.githubusercontent.com/u/16315650?v=4?s=100" width="100px;" alt="Sagar Vora"/><br /><sub><b>Sagar Vora</b></sub></a><br /><a href="#content-sagarvora" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/poneciak57"><img src="https://avatars.githubusercontent.com/u/94321164?v=4?s=100" width="100px;" alt="Kacper Poneta"/><br /><sub><b>Kacper Poneta</b></sub></a><br /><a href="#content-poneciak57" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://ktheory.com/"><img src="https://avatars.githubusercontent.com/u/975?v=4?s=100" width="100px;" alt="Aaron Suggs"/><br /><sub><b>Aaron Suggs</b></sub></a><br /><a href="#content-ktheory" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/alexwh"><img src="https://avatars.githubusercontent.com/u/1723612?v=4?s=100" width="100px;" alt="Alex"/><br /><sub><b>Alex</b></sub></a><br /><a href="#content-alexwh" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/stornquist"><img src="https://avatars.githubusercontent.com/u/42915664?v=4?s=100" width="100px;" alt="Sebastian Törnquist"/><br /><sub><b>Sebastian Törnquist</b></sub></a><br /><a href="#content-stornquist" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://smlavine.com"><img src="https://avatars.githubusercontent.com/u/33563640?v=4?s=100" width="100px;" alt="Sebastian LaVine"/><br /><sub><b>Sebastian LaVine</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=smlavine" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.alangerber.us"><img src="https://avatars.githubusercontent.com/u/201313?v=4?s=100" width="100px;" alt="Alan Gerber"/><br /><sub><b>Alan Gerber</b></sub></a><br /><a href="#content-akgerber" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://esotuvaka.github.io"><img src="https://avatars.githubusercontent.com/u/104941850?v=4?s=100" width="100px;" alt="Eric"/><br /><sub><b>Eric</b></sub></a><br /><a href="#content-esotuvaka" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/az0977776"><img src="https://avatars.githubusercontent.com/u/9172038?v=4?s=100" width="100px;" alt="Aaron Wang"/><br /><sub><b>Aaron Wang</b></sub></a><br /><a href="#content-az0977776" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/nmay231"><img src="https://avatars.githubusercontent.com/u/35386821?v=4?s=100" width="100px;" alt="Noah"/><br /><sub><b>Noah</b></sub></a><br /><a href="#content-nmay231" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/rb5014"><img src="https://avatars.githubusercontent.com/u/105397317?v=4?s=100" width="100px;" alt="rb5014"/><br /><sub><b>rb5014</b></sub></a><br /><a href="#content-rb5014" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/deedy5"><img src="https://avatars.githubusercontent.com/u/65482418?v=4?s=100" width="100px;" alt="deedy5"/><br /><sub><b>deedy5</b></sub></a><br /><a href="#content-deedy5" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/lionel-rowe"><img src="https://avatars.githubusercontent.com/u/26078826?v=4?s=100" width="100px;" alt="lionel-rowe"/><br /><sub><b>lionel-rowe</b></sub></a><br /><a href="#content-lionel-rowe" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Ben2917"><img src="https://avatars.githubusercontent.com/u/10279994?v=4?s=100" width="100px;" alt="Ben"/><br /><sub><b>Ben</b></sub></a><br /><a href="#content-Ben2917" title="Content">🖋</a></td>
    </tr>
  </tbody>
 </table>
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,61 @@
+<a name="5.5.1"></a>
+## 5.5.1 (2023-05-17)
+
+#### Fixed
+
+- Reverted `rust-project.json` path generation due to an upstream `rust-analyzer` fix.
+
+<a name="5.5.0"></a>
+## 5.5.0 (2023-05-17)
+
+#### Added
+
+- `strings2`: Added a reference to the book chapter for reference conversion
+- `lifetimes`: Added a link to the lifetimekata project
+- Added a new `tests4` exercises, which teaches about testing for panics
+- Added a `!` prefix command to watch mode that runs an external command
+- Added a `--success-hints` option to watch mode that shows hints on exercise success
+
+#### Changed
+
+- `vecs2`: Renamed iterator variable bindings for clarify
+- `lifetimes`: Changed order of book references
+- `hashmaps2`: Clarified instructions in the todo block
+- Moved lifetime exercises before test exercises (via the recommended book ordering)
+- `options2`: Improved tests for layering options
+- `modules2`: Added more information to the hint
+
+#### Fixed
+
+- `errors2`: Corrected a comment wording
+- `iterators2`: Fixed a spelling mistake in the hint text
+- `variables`: Wrapped the mut keyword with backticks for readability
+- `move_semantics2`: Removed references to line numbers
+- `cow1`: Clarified the `owned_no_mutation` comments
+- `options3`: Changed exercise to panic when no match is found
+- `rustlings lsp` now generates absolute paths, which should fix VSCode `rust-analyzer` usage on Windows
+
+#### Housekeeping
+
+- Added a markdown linter to run on GitHub actions
+- Split quick installation section into two code blocks
+
+<a name="5.4.1"></a>
+## 5.4.1 (2023-03-10)
+
+#### Changed
+
+- `vecs`: Added links to `iter_mut` and `map` to README.md
+- `cow1`: Changed main to tests
+- `iterators1`: Formatted according to rustfmt
+
+#### Fixed
+
+- `errors5`: Unified undisclosed type notation
+- `arc1`: Improved readability by avoiding implicit dereference
+- `macros4`: Prevented auto-fix by adding `#[rustfmt::skip]`
+- `cli`: Actually show correct progress percentages
+
 <a name="5.4.0"></a>

 ## 5.4.0 (2023-02-12)
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,18 +4,18 @@ version = 3

 [[package]]
 name = "aho-corasick"
-version = "0.7.18"
+version = "0.7.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
 dependencies = [
 "memchr",
 ]

 [[package]]
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-version = "0.1.5"
+version = "0.1.10"
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-checksum = "2e7317a549bc17c5278d9e72bb6e62c6aa801ac2567048e39ebc1c194249323e"
+checksum = "ab257697eb9496bf75526f0217b5ed64636a9cfafa78b8365c71bd283fcef93e"
 dependencies = [
 "argh_derive",
 "argh_shared",
@@ -23,22 +23,21 @@ dependencies = [

 [[package]]
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-version = "0.1.5"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60949c42375351e9442e354434b0cba2ac402c1237edf673cac3a4bf983b8d3c"
+checksum = "b382dbd3288e053331f03399e1db106c9fb0d8562ad62cb04859ae926f324fa6"
 dependencies = [
 "argh_shared",
- "heck",
 "proc-macro2",
 "quote",
- "syn",
+ "syn 1.0.109",
 ]

 [[package]]
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-version = "0.1.5"
+version = "0.1.10"
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+checksum = "64cb94155d965e3d37ffbbe7cc5b82c3dd79dd33bd48e536f73d2cfb8d85506f"

 [[package]]
 name = "assert_cmd"
@@ -54,9 +53,9 @@ dependencies = [

 [[package]]
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-version = "1.0.1"
+version = "1.1.0"
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+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"

 [[package]]
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@@ -78,17 +77,15 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"

 [[package]]
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-version = "0.15.0"
+version = "0.15.5"
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-checksum = "a28b32d32ca44b70c3e4acd7db1babf555fa026e385fb95f18028f88848b3c31"
+checksum = "c3d79fbe8970a77e3e34151cc13d3b3e248aa0faaecb9f6091fa07ebefe5ad60"
 dependencies = [
 "encode_unicode",
+ "lazy_static",
 "libc",
- "once_cell",
- "regex",
- "terminal_size",
 "unicode-width",
- "winapi 0.3.9",
+ "windows-sys 0.42.0",
 ]

 [[package]]
@@ -117,14 +114,14 @@ dependencies = [

 [[package]]
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-version = "0.2.15"
+version = "0.2.20"
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+checksum = "8a3de6e8d11b22ff9edc6d916f890800597d60f8b2da1caf2955c274638d6412"
 dependencies = [
 "cfg-if 1.0.0",
 "libc",
 "redox_syscall",
- "winapi 0.3.9",
+ "windows-sys 0.45.0",
 ]

 [[package]]
@@ -173,24 +170,15 @@ checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"

 [[package]]
 name = "glob"
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+version = "0.3.1"
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-dependencies = [
- "unicode-segmentation",
-]
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"

 [[package]]
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-version = "0.5.3"
+version = "0.5.4"
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-checksum = "2456aef2e6b6a9784192ae780c0f15bc57df0e918585282325e8c8ac27737654"
+checksum = "747309b4b440c06d57b0b25f2aee03ee9b5e5397d288c60e21fc709bb98a7408"
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@@ -238,9 +226,9 @@ dependencies = [

 [[package]]
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+checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"

 [[package]]
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@@ -266,24 +254,24 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"

 [[package]]
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-checksum = "a1fa8cddc8fbbee11227ef194b5317ed014b8acbf15139bd716a18ad3fe99ec5"
+checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"

 [[package]]
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-checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
+checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
 dependencies = [
 "cfg-if 1.0.0",
 ]

 [[package]]
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-version = "2.4.1"
+version = "2.5.0"
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-checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"

 [[package]]
 name = "mio"
@@ -330,9 +318,9 @@ dependencies = [

 [[package]]
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+version = "0.2.38"
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-checksum = "391630d12b68002ae1e25e8f974306474966550ad82dac6886fb8910c19568ae"
+checksum = "74d0df99cfcd2530b2e694f6e17e7f37b8e26bb23983ac530c0c97408837c631"
 dependencies = [
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 "libc",
@@ -365,9 +353,9 @@ dependencies = [

 [[package]]
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+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
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@@ -378,12 +366,6 @@ version = "0.4.0"
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-[[package]]
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-
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@@ -399,52 +381,52 @@ dependencies = [

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+version = "1.0.6"
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+checksum = "b794032607612e7abeb4db69adb4e33590fa6cf1149e95fd7cb00e634b92f174"

 [[package]]
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+checksum = "368ba315fb8c5052ab692e68a0eefec6ec57b23a36959c14496f0b0df2c0cecf"
 dependencies = [
 "predicates-core",
- "treeline",
+ "termtree",
 ]

 [[package]]
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+checksum = "ba466839c78239c09faf015484e5cc04860f88242cff4d03eb038f04b4699b73"
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+ "unicode-ident",
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 [[package]]
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+checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
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 [[package]]
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+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
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 [[package]]
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 [[package]]
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 "quote",
- "syn",
+ "syn 2.0.8",
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+dependencies = [
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- "libc",
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+dependencies = [
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+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
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+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
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+]
+
+[[package]]
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+dependencies = [
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+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
 [[package]]
 name = "ws2_32-sys"
 version = "0.2.1"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "rustlings"
-version = "5.4.0"
+description = "Small exercises to get you used to reading and writing Rust code!"
+version = "5.5.1"
 authors = [
  "Liv <mokou@fastmail.com>",
  "Carol (Nichols || Goulding) <carol.nichols@gmail.com>",
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
+<div class="oranda-hide">
+
 # rustlings 🦀❤️

+</div>
+
 Greetings and welcome to `rustlings`. This project contains small exercises to get you used to reading and writing Rust code. This includes reading and responding to compiler messages!

 _...looking for the old, web-based version of Rustlings? Try [here](https://github.com/rust-lang/rustlings/tree/rustlings-1)_
@@ -22,7 +26,10 @@ Just run:

 ```bash
 curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash
-# Or if you want it to be installed to a different path:
+```
+Or if you want it to be installed to a different path:
+
+```bash
 curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash -s mypath/
 ```

@@ -33,8 +40,8 @@ This will install Rustlings and give you access to the `rustlings` command. Run
 Basically: Clone the repository at the latest tag, finally run `nix develop` or `nix-shell`.

 ```bash
-# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
-git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.5.1)
+git clone -b 5.5.1 --depth 1 https://github.com/rust-lang/rustlings
 cd rustlings
 # if nix version > 2.3
 nix develop
@@ -62,17 +69,17 @@ If you get a permission denied message, you might have to exclude the directory

 ## Browser

-[Run on Repl.it](https://repl.it/github/rust-lang/rustlings)
-
 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/rust-lang/rustlings)

+[![Open Rustlings On Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new/?repo=rust-lang%2Frustlings&ref=main)
+
 ## Manually

 Basically: Clone the repository at the latest tag, run `cargo install --path .`.

 ```bash
-# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
-git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.5.1)
+git clone -b 5.5.1 --depth 1 https://github.com/rust-lang/rustlings
 cd rustlings
 cargo install --force --path .
 ```
@@ -155,8 +162,7 @@ for you:
 rm -rf rustlings # or your custom folder name, if you chose and or renamed it
 ```

-Second, since Rustlings got installed via `cargo install`, it's only reasonable to assume that you can also remove it using Cargo, and
-exactly that is the case. Run `cargo uninstall` to remove the `rustlings` binary:
+Second, run `cargo uninstall` to remove the `rustlings` binary:

 ```bash
 cargo uninstall rustlings
--- a/exercises/conversions/README.md
+++ b/exercises/conversions/README.md
@@ -6,6 +6,7 @@ The simplest form of type conversion is a type cast expression. It is denoted wi

 Rust also offers traits that facilitate type conversions upon implementation. These traits can be found under the [`convert`](https://doc.rust-lang.org/std/convert/index.html) module.
 The traits are the following:
+
 - `From` and `Into` covered in [`from_into`](from_into.rs)
 - `TryFrom` and `TryInto` covered in [`try_from_into`](try_from_into.rs)
 - `AsRef` and `AsMut` covered in [`as_ref_mut`](as_ref_mut.rs)
@@ -17,5 +18,6 @@ These should be the main ways ***within the standard library*** to convert data
 ## Further information

 These are not directly covered in the book, but the standard library has a great documentation for it.
+
 - [conversions](https://doc.rust-lang.org/std/convert/index.html)
- [`FromStr` trait](https://doc.rust-lang.org/std/str/trait.FromStr.html)
+- [`FromStr` trait](https://doc.rust-lang.org/std/str/trait.FromStr.html)
--- a/exercises/error_handling/README.md
+++ b/exercises/error_handling/README.md
@@ -1,5 +1,6 @@
 # Error handling
-Most errors aren’t serious enough to require the program to stop entirely. 
+
+Most errors aren’t serious enough to require the program to stop entirely.
 Sometimes, when a function fails, it’s for a reason that you can easily interpret and respond to.
 For example, if you try to open a file and that operation fails because the file doesn’t exist, you might want to create the file instead of terminating the process.

--- a/exercises/error_handling/errors2.rs
+++ b/exercises/error_handling/errors2.rs
@@ -2,7 +2,7 @@
 // Say we're writing a game where you can buy items with tokens. All items cost
 // 5 tokens, and whenever you purchase items there is a processing fee of 1
 // token. A player of the game will type in how many items they want to buy,
-// and the `total_cost` function will calculate the total number of tokens.
+// and the `total_cost` function will calculate the total cost of the tokens.
 // Since the player typed in the quantity, though, we get it as a string-- and
 // they might have typed anything, not just numbers!

--- a/exercises/error_handling/errors5.rs
+++ b/exercises/error_handling/errors5.rs
@@ -4,7 +4,7 @@

 // This exercise uses some concepts that we won't get to until later in the course, like `Box` and the
 // `From` trait. It's not important to understand them in detail right now, but you can read ahead if you like.
-// For now, think of the `Box<dyn ...>` type as an "I want anything that does ???" type, which, given
+// For now, think of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, given
 // Rust's usual standards for runtime safety, should strike you as somewhat lenient!

 // In short, this particular use case for boxes is for when you want to own a value and you care only that it is a
--- a/exercises/hashmaps/README.md
+++ b/exercises/hashmaps/README.md
@@ -1,6 +1,7 @@
 # Hashmaps
+
 A *hash map* allows you to associate a value with a particular key.
-You may also know this by the names [*unordered map* in C++](https://en.cppreference.com/w/cpp/container/unordered_map), 
+You may also know this by the names [*unordered map* in C++](https://en.cppreference.com/w/cpp/container/unordered_map),
 [*dictionary* in Python](https://docs.python.org/3/tutorial/datastructures.html#dictionaries) or an *associative array* in other languages.

 This is the other data structure that we've been talking about before, when
--- a/exercises/hashmaps/hashmaps2.rs
+++ b/exercises/hashmaps/hashmaps2.rs
@@ -1,11 +1,13 @@
 // hashmaps2.rs
-
-// A basket of fruits in the form of a hash map is given. The key
-// represents the name of the fruit and the value represents how many
-// of that particular fruit is in the basket. You have to put *MORE
-// THAN 11* fruits in the basket. Three types of fruits - Apple (4),
-// Mango (2) and Lychee (5) are already given in the basket. You are
-// not allowed to insert any more of these fruits!
+// We're collecting different fruits to bake a delicious fruit cake.
+// For this, we have a basket, which we'll represent in the form of a hash
+// map. The key represents the name of each fruit we collect and the value
+// represents how many of that particular fruit we have collected.
+// Three types of fruits - Apple (4), Mango (2) and Lychee (5) are already
+// in the basket hash map.
+// You must add fruit to the basket so that there is at least
+// one of each kind and more than 11 in total - we have a lot of mouths to feed.
+// You are not allowed to insert any more of these fruits!
 //
 // Make me pass the tests!
 //
@@ -34,8 +36,8 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
    ];

    for fruit in fruit_kinds {
-        // TODO: Put new fruits if not already present. Note that you
-        // are not allowed to put any type of fruit that's already
+        // TODO: Insert new fruits if they are not already present in the basket.
+        // Note that you are not allowed to put any type of fruit that's already
        // present!
    }
 }
@@ -44,6 +46,7 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
 mod tests {
    use super::*;

+    // Don't modify this function!
    fn get_fruit_basket() -> HashMap<Fruit, u32> {
        let mut basket = HashMap::<Fruit, u32>::new();
        basket.insert(Fruit::Apple, 4);
--- a/exercises/iterators/iterators1.rs
+++ b/exercises/iterators/iterators1.rs
@@ -10,7 +10,7 @@

 // I AM NOT DONE

-fn main () {
+fn main() {
    let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];

    let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
--- a/exercises/iterators/iterators5.rs
+++ b/exercises/iterators/iterators5.rs
@@ -2,13 +2,11 @@
 // Let's define a simple model to track Rustlings exercise progress. Progress
 // will be modelled using a hash map. The name of the exercise is the key and
 // the progress is the value. Two counting functions were created to count the
-// number of exercises with a given progress. These counting functions use
-// imperative style for loops. Recreate this counting functionality using
-// iterators. Only the two iterator methods (count_iterator and
-// count_collection_iterator) need to be modified.
+// number of exercises with a given progress. Recreate this counting
+// functionality using iterators. Try not to use imperative loops (for, while).
+// Only the two iterator methods (count_iterator and count_collection_iterator)
+// need to be modified.
 // Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a hint.
-//
-// Make the code compile and the tests pass.

 // I AM NOT DONE

@@ -67,12 +65,27 @@ mod tests {
    }

    #[test]
-    fn count_equals_for() {
+    fn count_some() {
        let map = get_map();
-        assert_eq!(
-            count_for(&map, Progress::Complete),
-            count_iterator(&map, Progress::Complete)
-        );
+        assert_eq!(1, count_iterator(&map, Progress::Some));
+    }
+
+    #[test]
+    fn count_none() {
+        let map = get_map();
+        assert_eq!(2, count_iterator(&map, Progress::None));
+    }
+
+    #[test]
+    fn count_complete_equals_for() {
+        let map = get_map();
+        let progressStates = vec![Progress::Complete, Progress::Some, Progress::None];
+        for progressState in progressStates {
+            assert_eq!(
+                count_for(&map, progressState),
+                count_iterator(&map, progressState)
+            );
+        }
    }

    #[test]
@@ -85,12 +98,28 @@ mod tests {
    }

    #[test]
-    fn count_collection_equals_for() {
+    fn count_collection_some() {
        let collection = get_vec_map();
-        assert_eq!(
-            count_collection_for(&collection, Progress::Complete),
-            count_collection_iterator(&collection, Progress::Complete)
-        );
+        assert_eq!(1, count_collection_iterator(&collection, Progress::Some));
+    }
+
+    #[test]
+    fn count_collection_none() {
+        let collection = get_vec_map();
+        assert_eq!(4, count_collection_iterator(&collection, Progress::None));
+    }
+
+    #[test]
+    fn count_collection_equals_for() {
+        let progressStates = vec![Progress::Complete, Progress::Some, Progress::None];
+        let collection = get_vec_map();
+
+        for progressState in progressStates {
+            assert_eq!(
+                count_collection_for(&collection, progressState),
+                count_collection_iterator(&collection, progressState)
+            );
+        }
    }

    fn get_map() -> HashMap<String, Progress> {
--- a/exercises/lifetimes/README.md
+++ b/exercises/lifetimes/README.md
@@ -3,15 +3,20 @@
 Lifetimes tell the compiler how to check whether references live long
 enough to be valid in any given situation. For example lifetimes say
 "make sure parameter 'a' lives as long as parameter 'b' so that the return
-value is valid". 
+value is valid".

-They are only necessary on borrows, i.e. references, 
+They are only necessary on borrows, i.e. references,
 since copied parameters or moves are owned in their scope and cannot
 be referenced outside. Lifetimes mean that calling code of e.g. functions
-can be checked to make sure their arguments are valid. Lifetimes are 
+can be checked to make sure their arguments are valid. Lifetimes are
 restrictive of their callers.

+If you'd like to learn more about lifetime annotations, the
+[lifetimekata](https://tfpk.github.io/lifetimekata/) project
+has a similar style of exercises to Rustlings, but is all about
+learning to write lifetime annotations.
+
 ## Further information

- [Validating References with Lifetimes](https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html)
 - [Lifetimes (in Rust By Example)](https://doc.rust-lang.org/stable/rust-by-example/scope/lifetime.html)
+- [Validating References with Lifetimes](https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html)
--- a/exercises/macros/README.md
+++ b/exercises/macros/README.md
@@ -4,7 +4,7 @@ Rust's macro system is very powerful, but also kind of difficult to wrap your
 head around. We're not going to teach you how to write your own fully-featured
 macros. Instead, we'll show you how to use and create them.

-If you'd like to learn more about writing your own macros, the 
+If you'd like to learn more about writing your own macros, the
 [macrokata](https://github.com/tfpk/macrokata) project has a similar style
 of exercises to Rustlings, but is all about learning to write Macros.

--- a/exercises/macros/macros4.rs
+++ b/exercises/macros/macros4.rs
@@ -3,6 +3,7 @@

 // I AM NOT DONE

+#[rustfmt::skip]
 macro_rules! my_macro {
    () => {
        println!("Check out my macro!");
--- a/exercises/move_semantics/move_semantics2.rs
+++ b/exercises/move_semantics/move_semantics2.rs
@@ -1,12 +1,16 @@
 // move_semantics2.rs
-// Make me compile without changing line 13 or moving line 10!
 // Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.

+// Expected output:
+// vec0 has length 3 content `[22, 44, 66]`
+// vec1 has length 4 content `[22, 44, 66, 88]`
+
 // I AM NOT DONE

 fn main() {
    let vec0 = Vec::new();

+    // Do not move the following line!
    let mut vec1 = fill_vec(vec0);

    // Do not change the following line!
--- a/exercises/options/README.md
+++ b/exercises/options/README.md
@@ -1,7 +1,8 @@
 # Options

-Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not. 
+Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not.
 Option types are very common in Rust code, as they have a number of uses:
+
 - Initial values
 - Return values for functions that are not defined over their entire input range (partial functions)
 - Return value for otherwise reporting simple errors, where None is returned on error
--- a/exercises/options/options2.rs
+++ b/exercises/options/options2.rs
@@ -18,17 +18,22 @@ mod tests {

    #[test]
    fn layered_option() {
-        let mut range = 10;
-        let mut optional_integers: Vec<Option<i8>> = Vec::new();
-        for i in 0..(range + 1) {
+        let range = 10;
+        let mut optional_integers: Vec<Option<i8>> = vec![None];
+
+        for i in 1..(range + 1) {
            optional_integers.push(Some(i));
        }

+        let mut cursor = range;
+
        // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
-        // You can stack `Option<T>`'s into while let and if let
+        // You can stack `Option<T>`s into while let and if let
        integer = optional_integers.pop() {
-            assert_eq!(integer, range);
-            range -= 1;
+            assert_eq!(integer, cursor);
+            cursor -= 1;
        }
+
+        assert_eq!(cursor, 0);
    }
 }
--- a/exercises/options/options3.rs
+++ b/exercises/options/options3.rs
@@ -13,7 +13,7 @@ fn main() {

    match y {
        Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),
-        _ => println!("no match"),
+        _ => panic!("no match!"),
    }
    y; // Fix without deleting this line.
 }
--- a/exercises/smart_pointers/README.md
+++ b/exercises/smart_pointers/README.md
@@ -1,4 +1,5 @@
 # Smart Pointers
+
 In Rust, smart pointers are variables that contain an address in memory and reference some other data, but they also have additional metadata and capabilities.
 Smart pointers in Rust often own the data they point to, while references only borrow data.

--- a/exercises/smart_pointers/arc1.rs
+++ b/exercises/smart_pointers/arc1.rs
@@ -32,7 +32,7 @@ fn main() {
    for offset in 0..8 {
        let child_numbers = // TODO
        joinhandles.push(thread::spawn(move || {
-            let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
+            let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
            println!("Sum of offset {} is {}", offset, sum);
        }));
    }
--- a/exercises/smart_pointers/cow1.rs
+++ b/exercises/smart_pointers/cow1.rs
@@ -4,6 +4,9 @@
 // Cow is a clone-on-write smart pointer.
 // It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
 // The type is designed to work with general borrowed data via the Borrow trait.
+//
+// This exercise is meant to show you what to expect when passing data to Cow.
+// Fix the unit tests by checking for Cow::Owned(_) and Cow::Borrowed(_) at the TODO markers.

 // I AM NOT DONE

@@ -20,29 +23,53 @@ fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
    input
 }

-fn main() {
-    // No clone occurs because `input` doesn't need to be mutated.
-    let slice = [0, 1, 2];
-    let mut input = Cow::from(&slice[..]);
-    match abs_all(&mut input) {
-        Cow::Borrowed(_) => println!("I borrowed the slice!"),
-        _ => panic!("expected borrowed value"),
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn reference_mutation() -> Result<(), &'static str> {
+        // Clone occurs because `input` needs to be mutated.
+        let slice = [-1, 0, 1];
+        let mut input = Cow::from(&slice[..]);
+        match abs_all(&mut input) {
+            Cow::Owned(_) => Ok(()),
+            _ => Err("Expected owned value"),
+        }
    }

-    // Clone occurs because `input` needs to be mutated.
-    let slice = [-1, 0, 1];
-    let mut input = Cow::from(&slice[..]);
-    match abs_all(&mut input) {
-        Cow::Owned(_) => println!("I modified the slice and now own it!"),
-        _ => panic!("expected owned value"),
+    #[test]
+    fn reference_no_mutation() -> Result<(), &'static str> {
+        // No clone occurs because `input` doesn't need to be mutated.
+        let slice = [0, 1, 2];
+        let mut input = Cow::from(&slice[..]);
+        match abs_all(&mut input) {
+            // TODO
+        }
    }

-    // No clone occurs because `input` is already owned.
-    let slice = vec![-1, 0, 1];
-    let mut input = Cow::from(slice);
-    match abs_all(&mut input) {
-        // TODO
-        Cow::Borrowed(_) => println!("I own this slice!"),
-        _ => panic!("expected borrowed value"),
+    #[test]
+    fn owned_no_mutation() -> Result<(), &'static str> {
+        // We can also pass `slice` without `&` so Cow owns it directly.
+        // In this case no mutation occurs and thus also no clone,
+        // but the result is still owned because it was never borrowed
+        // or mutated.
+        let slice = vec![0, 1, 2];
+        let mut input = Cow::from(slice);
+        match abs_all(&mut input) {
+            // TODO
+        }
+    }
+
+    #[test]
+    fn owned_mutation() -> Result<(), &'static str> {
+        // Of course this is also the case if a mutation does occur.
+        // In this case the call to `to_mut()` returns a reference to
+        // the same data as before.
+        let slice = vec![-1, 0, 1];
+        let mut input = Cow::from(slice);
+        match abs_all(&mut input) {
+            // TODO
+        }
    }
 }
--- a/exercises/tests/tests4.rs
+++ b/exercises/tests/tests4.rs
@@ -0,0 +1,45 @@
+// tests4.rs
+// Make sure that we're testing for the correct conditions!
+// Execute `rustlings hint tests4` or use the `hint` watch subcommand for a hint.
+
+// I AM NOT DONE
+
+struct Rectangle {
+    width: i32,
+    height: i32
+}
+
+impl Rectangle {
+    // Only change the test functions themselves
+    pub fn new(width: i32, height: i32) -> Self {
+        if width <= 0 || height <= 0 {
+            panic!("Rectangle width and height cannot be negative!")
+        }
+        Rectangle {width, height}
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn correct_width_and_height() {
+        // This test should check if the rectangle is the size that we pass into its constructor
+        let rect = Rectangle::new(10, 20);
+        assert_eq!(???, 10); // check width
+        assert_eq!(???, 20); // check height
+    }
+
+    #[test]
+    fn negative_width() {
+        // This test should check if program panics when we try to create rectangle with negative width
+        let _rect = Rectangle::new(-10, 10);
+    }
+
+    #[test]
+    fn negative_height() {
+        // This test should check if program panics when we try to create rectangle with negative height
+        let _rect = Rectangle::new(10, -10);
+    }
+}
--- a/exercises/threads/threads1.rs
+++ b/exercises/threads/threads1.rs
@@ -30,7 +30,7 @@ fn main() {
    if results.len() != 10 {
        panic!("Oh no! All the spawned threads did not finish!");
    }
-    
+
    println!();
    for (i, result) in results.into_iter().enumerate() {
        println!("thread {} took {}ms", i, result);
--- a/exercises/traits/README.md
+++ b/exercises/traits/README.md
@@ -7,13 +7,13 @@ Data types can implement traits. To do so, the methods making up the trait are d
 In this way, traits are somewhat similar to Java interfaces and C++ abstract classes.

 Some additional common Rust traits include:
+
 - `Clone` (the `clone` method)
 - `Display` (which allows formatted display via `{}`)
 - `Debug` (which allows formatted display via `{:?}`)

 Because traits indicate shared behavior between data types, they are useful when writing generics.

-
 ## Further information

 - [Traits](https://doc.rust-lang.org/book/ch10-02-traits.html)
--- a/exercises/variables/README.md
+++ b/exercises/variables/README.md
@@ -2,7 +2,7 @@

 In Rust, variables are immutable by default.
 When a variable is immutable, once a value is bound to a name, you can’t change that value.
-You can make them mutable by adding mut in front of the variable name.
+You can make them mutable by adding `mut` in front of the variable name.

 ## Further information

--- a/exercises/vecs/README.md
+++ b/exercises/vecs/README.md
@@ -13,3 +13,5 @@ the other useful data structure, hash maps, later.
 ## Further information

 - [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
+- [`iter_mut`](https://doc.rust-lang.org/std/primitive.slice.html#method.iter_mut)
+- [`map`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map)
--- a/exercises/vecs/vecs2.rs
+++ b/exercises/vecs/vecs2.rs
@@ -9,7 +9,7 @@
 // I AM NOT DONE

 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
-    for i in v.iter_mut() {
+    for element in v.iter_mut() {
        // TODO: Fill this up so that each element in the Vec `v` is
        // multiplied by 2.
        ???
@@ -20,7 +20,7 @@ fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
 }

 fn vec_map(v: &Vec<i32>) -> Vec<i32> {
-    v.iter().map(|num| {
+    v.iter().map(|element| {
        // TODO: Do the same thing as above - but instead of mutating the
        // Vec, you can just return the new number!
        ???
--- a/flake.nix
+++ b/flake.nix
@@ -22,7 +22,7 @@
        rustlings =
          pkgs.rustPlatform.buildRustPackage {
            name = "rustlings";
-            version = "5.4.0";
+            version = "5.5.1";

            buildInputs = cargoBuildInputs;

--- a/info.toml
+++ b/info.toml
@@ -325,8 +325,7 @@ doing one step and then fixing the compiler errors that result!
 So the end goal is to:
   - get rid of the first line in main that creates the new vector
   - so then `vec0` doesn't exist, so we can't pass it to `fill_vec`
-   - we don't want to pass anything to `fill_vec`, so its signature should
-     reflect that it does not take any arguments
+   - `fill_vec` has had its signature changed, which our call should reflect
   - since we're not creating a new vec in `main` anymore, we need to create
     a new vec in `fill_vec`, similarly to the way we did in `main`"""

@@ -439,7 +438,9 @@ mode = "compile"
 hint = """
 Yes, it would be really easy to fix this by just changing the value bound to `word` to be a
 string slice instead of a `String`, wouldn't it?? There is a way to add one character to line
-9, though, that will coerce the `String` into a string slice."""
+9, though, that will coerce the `String` into a string slice.
+
+Side note: If you're interested in learning about how this kind of reference conversion works, you can jump ahead in the book and read this part in the smart pointers chapter: https://doc.rust-lang.org/stable/book/ch15-02-deref.html#implicit-deref-coercions-with-functions-and-methods"""

 [[exercises]]
 name = "strings3"
@@ -477,7 +478,8 @@ hint = """
 The delicious_snacks module is trying to present an external interface that is
 different than its internal structure (the `fruits` and `veggies` modules and
 associated constants). Complete the `use` statements to fit the uses in main and
-find the one keyword missing for both constants."""
+find the one keyword missing for both constants.
+Learn more at https://doc.rust-lang.org/book/ch07-04-bringing-paths-into-scope-with-the-use-keyword.html#re-exporting-names-with-pub-use"""

 [[exercises]]
 name = "modules3"
@@ -746,6 +748,33 @@ hint = """
 To find the best solution to this challenge you're going to need to think back to your
 knowledge of traits, specifically Trait Bound Syntax -  you may also need this: `use std::fmt::Display;`."""

+# LIFETIMES
+
+[[exercises]]
+name = "lifetimes1"
+path = "exercises/lifetimes/lifetimes1.rs"
+mode = "compile"
+hint = """
+Let the compiler guide you. Also take a look at the book if you need help:
+https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html"""
+
+[[exercises]]
+name = "lifetimes2"
+path = "exercises/lifetimes/lifetimes2.rs"
+mode = "compile"
+hint = """
+Remember that the generic lifetime 'a will get the concrete lifetime that is equal to the smaller of the lifetimes of x and y.
+You can take at least two paths to achieve the desired result while keeping the inner block:
+1. Move the string2 declaration to make it live as long as string1 (how is result declared?)
+2. Move println! into the inner block"""
+
+[[exercises]]
+name = "lifetimes3"
+path = "exercises/lifetimes/lifetimes3.rs"
+mode = "compile"
+hint = """
+If you use a lifetime annotation in a struct's fields, where else does it need to be added?"""
+
 # TESTS

 [[exercises]]
@@ -778,32 +807,16 @@ You can call a function right where you're passing arguments to `assert!` -- so
 something like `assert!(having_fun())`. If you want to check that you indeed get false, you
 can negate the result of what you're doing using `!`, like `assert!(!having_fun())`."""

-# LIFETIMES
-
 [[exercises]]
-name = "lifetimes1"
-path = "exercises/lifetimes/lifetimes1.rs"
-mode = "compile"
+name = "tests4"
+path = "exercises/tests/tests4.rs"
+mode = "test"
 hint = """
-Let the compiler guide you. Also take a look at the book if you need help:
-https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html"""
+We expect method `Rectangle::new()` to panic for negative values.
+To handle that you need to add a special attribute to the test function.
+You can refer to the docs:
+https://doc.rust-lang.org/stable/book/ch11-01-writing-tests.html#checking-for-panics-with-should_panic"""

-[[exercises]]
-name = "lifetimes2"
-path = "exercises/lifetimes/lifetimes2.rs"
-mode = "compile"
-hint = """
-Remember that the generic lifetime 'a will get the concrete lifetime that is equal to the smaller of the lifetimes of x and y.
-You can take at least two paths to achieve the desired result while keeping the inner block:
-1. Move the string2 declaration to make it live as long as string1 (how is result declared?)
-2. Move println! into the inner block"""
-
-[[exercises]]
-name = "lifetimes3"
-path = "exercises/lifetimes/lifetimes3.rs"
-mode = "compile"
-hint = """
-If you use a lifetime annotation in a struct's fields, where else does it need to be added?"""

 # STANDARD LIBRARY TYPES

@@ -842,7 +855,7 @@ Create an iterator from the slice. Transform the iterated values by applying
 the `capitalize_first` function. Remember to collect the iterator.

 Step 3.
-This is surprising similar to the previous solution. Collect is very powerful
+This is surprisingly similar to the previous solution. Collect is very powerful
 and very general. Rust just needs to know the desired type."""

 [[exercises]]
@@ -1010,11 +1023,11 @@ https://doc.rust-lang.org/stable/book/ch16-00-concurrency.html
 [[exercises]]
 name = "cow1"
 path = "exercises/smart_pointers/cow1.rs"
-mode = "compile"
+mode = "test"
 hint = """
-Since the vector is already owned, the `Cow` type doesn't need to clone it.
+If Cow already owns the data it doesn't need to clone it when to_mut() is called.

-Checkout https://doc.rust-lang.org/std/borrow/enum.Cow.html for documentation
+Check out https://doc.rust-lang.org/std/borrow/enum.Cow.html for documentation
 on the `Cow` type.
 """

--- a/install.sh
+++ b/install.sh
@@ -141,7 +141,7 @@ git clone -q https://github.com/rust-lang/rustlings "$Path"

 cd "$Path"

-Version=$(curl -s https://api.github.com/repos/rust-lang/rustlings/releases/latest | ${PY} -c "import json,sys;obj=json.load(sys.stdin);print(obj['tag_name']);")
+Version=$(curl -s https://api.github.com/repos/rust-lang/rustlings/releases/latest | ${PY} -c "import json,sys;obj=json.load(sys.stdin);print(obj['tag_name']) if 'tag_name' in obj else sys.exit(f\"Error: {obj['message']}\");")
 CargoBin="${CARGO_HOME:-$HOME/.cargo}/bin"

 if [[ -z ${Version} ]]
--- a/oranda.json
+++ b/oranda.json
@@ -0,0 +1,10 @@
+{
+  "homepage": "https://rustlings.cool",
+  "repository": "https://github.com/rust-lang/rustlings",
+  "analytics": {
+    "plausible": {
+      "domain": "rustlings.cool"
+    }
+  },
+  "changelog": true
+}
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,7 +26,7 @@ mod run;
 mod verify;

 // In sync with crate version
-const VERSION: &str = "5.4.0";
+const VERSION: &str = "5.5.1";

 #[derive(FromArgs, PartialEq, Debug)]
 /// Rustlings is a collection of small exercises to get you used to writing and reading Rust code
@@ -61,7 +61,11 @@ struct VerifyArgs {}
 #[derive(FromArgs, PartialEq, Debug)]
 #[argh(subcommand, name = "watch")]
 /// Reruns `verify` when files were edited
-struct WatchArgs {}
+struct WatchArgs {
+    /// show hints on success
+    #[argh(switch)]
+    success_hints: bool,
+}

 #[derive(FromArgs, PartialEq, Debug)]
 #[argh(subcommand, name = "run")]
@@ -229,7 +233,7 @@ fn main() {
        }

        Subcommands::Verify(_subargs) => {
-            verify(&exercises, (0, exercises.len()), verbose)
+            verify(&exercises, (0, exercises.len()), verbose, false)
                .unwrap_or_else(|_| std::process::exit(1));
        }

@@ -252,7 +256,7 @@ fn main() {
            }
        }

-        Subcommands::Watch(_subargs) => match watch(&exercises, verbose) {
+        Subcommands::Watch(_subargs) => match watch(&exercises, verbose, _subargs.success_hints) {
            Err(e) => {
                println!(
                    "Error: Could not watch your progress. Error message was {:?}.",
@@ -298,13 +302,21 @@ fn spawn_watch_shell(
                    println!("Bye!");
                } else if input.eq("help") {
                    println!("Commands available to you in watch mode:");
-                    println!("  hint  - prints the current exercise's hint");
-                    println!("  clear - clears the screen");
-                    println!("  quit  - quits watch mode");
-                    println!("  help  - displays this help message");
+                    println!("  hint   - prints the current exercise's hint");
+                    println!("  clear  - clears the screen");
+                    println!("  quit   - quits watch mode");
+                    println!("  !<cmd> - executes a command, like `!rustc --explain E0381`");
+                    println!("  help   - displays this help message");
                    println!();
                    println!("Watch mode automatically re-evaluates the current exercise");
                    println!("when you edit a file's contents.")
+                } else if let Some(cmd) = input.strip_prefix('!') {
+                    let parts: Vec<&str> = cmd.split_whitespace().collect();
+                    if parts.is_empty() {
+                        println!("no command provided");
+                    } else if let Err(e) = Command::new(parts[0]).args(&parts[1..]).status() {
+                        println!("failed to execute command `{}`: {}", cmd, e);
+                    }
                } else {
                    println!("unknown command: {input}");
                }
@@ -340,7 +352,11 @@ enum WatchStatus {
    Unfinished,
 }

-fn watch(exercises: &[Exercise], verbose: bool) -> notify::Result<WatchStatus> {
+fn watch(
+    exercises: &[Exercise],
+    verbose: bool,
+    success_hints: bool,
+) -> notify::Result<WatchStatus> {
    /* Clears the terminal with an ANSI escape code.
    Works in UNIX and newer Windows terminals. */
    fn clear_screen() {
@@ -356,7 +372,12 @@ fn watch(exercises: &[Exercise], verbose: bool) -> notify::Result<WatchStatus> {
    clear_screen();

    let to_owned_hint = |t: &Exercise| t.hint.to_owned();
-    let failed_exercise_hint = match verify(exercises.iter(), (0, exercises.len()), verbose) {
+    let failed_exercise_hint = match verify(
+        exercises.iter(),
+        (0, exercises.len()),
+        verbose,
+        success_hints,
+    ) {
        Ok(_) => return Ok(WatchStatus::Finished),
        Err(exercise) => Arc::new(Mutex::new(Some(to_owned_hint(exercise)))),
    };
@@ -378,7 +399,12 @@ fn watch(exercises: &[Exercise], verbose: bool) -> notify::Result<WatchStatus> {
                            );
                        let num_done = exercises.iter().filter(|e| e.looks_done()).count();
                        clear_screen();
-                        match verify(pending_exercises, (num_done, exercises.len()), verbose) {
+                        match verify(
+                            pending_exercises,
+                            (num_done, exercises.len()),
+                            verbose,
+                            success_hints,
+                        ) {
                            Ok(_) => return Ok(WatchStatus::Finished),
                            Err(exercise) => {
                                let mut failed_exercise_hint = failed_exercise_hint.lock().unwrap();
@@ -433,8 +459,8 @@ started, here's a couple of notes about how Rustlings operates:
 4. If an exercise doesn't make sense to you, feel free to open an issue on GitHub!
   (https://github.com/rust-lang/rustlings/issues/new). We look at every issue,
   and sometimes, other learners do too so you can help each other out!
-5. If you want to use `rust-analyzer` with exercises, which provides features like 
-   autocompletion, run the command `rustlings lsp`. 
+5. If you want to use `rust-analyzer` with exercises, which provides features like
+   autocompletion, run the command `rustlings lsp`.

 Got all that? Great! To get started, run `rustlings watch` in order to get the first
 exercise. Make sure to have your editor open!"#;
--- a/src/project.rs
+++ b/src/project.rs
@@ -2,6 +2,7 @@ use glob::glob;
 use serde::{Deserialize, Serialize};
 use std::env;
 use std::error::Error;
+use std::path::PathBuf;
 use std::process::Command;

 /// Contains the structure of resulting rust-project.json file
@@ -38,11 +39,11 @@ impl RustAnalyzerProject {
    }

    /// If path contains .rs extension, add a crate to `rust-project.json`
-    fn path_to_json(&mut self, path: String) {
-        if let Some((_, ext)) = path.split_once('.') {
+    fn path_to_json(&mut self, path: PathBuf) -> Result<(), Box<dyn Error>> {
+        if let Some(ext) = path.extension() {
            if ext == "rs" {
                self.crates.push(Crate {
-                    root_module: path,
+                    root_module: path.display().to_string(),
                    edition: "2021".to_string(),
                    deps: Vec::new(),
                    // This allows rust_analyzer to work inside #[test] blocks
@@ -50,15 +51,16 @@ impl RustAnalyzerProject {
                })
            }
        }
+
+        Ok(())
    }

    /// Parse the exercises folder for .rs files, any matches will create
    /// a new `crate` in rust-project.json which allows rust-analyzer to
    /// treat it like a normal binary
    pub fn exercises_to_json(&mut self) -> Result<(), Box<dyn Error>> {
-        for e in glob("./exercises/**/*")? {
-            let path = e?.to_string_lossy().to_string();
-            self.path_to_json(path);
+        for path in glob("./exercises/**/*")? {
+            self.path_to_json(path?)?;
        }
        Ok(())
    }
--- a/src/verify.rs
+++ b/src/verify.rs
@@ -12,27 +12,28 @@ pub fn verify<'a>(
    exercises: impl IntoIterator<Item = &'a Exercise>,
    progress: (usize, usize),
    verbose: bool,
+    success_hints: bool,
 ) -> Result<(), &'a Exercise> {
-    let (mut num_done, total) = progress;
+    let (num_done, total) = progress;
    let bar = ProgressBar::new(total as u64);
+    let mut percentage = num_done as f32 / total as f32 * 100.0;
    bar.set_style(ProgressStyle::default_bar()
        .template("Progress: [{bar:60.green/red}] {pos}/{len} {msg}")
        .progress_chars("#>-")
    );
    bar.set_position(num_done as u64);
-    bar.set_message(format!("({:.1} %)", 0.));
+    bar.set_message(format!("({:.1} %)", percentage));

    for exercise in exercises {
        let compile_result = match exercise.mode {
-            Mode::Test => compile_and_test(exercise, RunMode::Interactive, verbose),
-            Mode::Compile => compile_and_run_interactively(exercise),
-            Mode::Clippy => compile_only(exercise),
+            Mode::Test => compile_and_test(exercise, RunMode::Interactive, verbose, success_hints),
+            Mode::Compile => compile_and_run_interactively(exercise, success_hints),
+            Mode::Clippy => compile_only(exercise, success_hints),
        };
        if !compile_result.unwrap_or(false) {
            return Err(exercise);
        }
-        num_done += 1;
-        let percentage = num_done as f32 / total as f32 * 100.0;
+        percentage += 100.0 / total as f32;
        bar.inc(1);
        bar.set_message(format!("({:.1} %)", percentage));
    }
@@ -46,12 +47,12 @@ enum RunMode {

 // Compile and run the resulting test harness of the given Exercise
 pub fn test(exercise: &Exercise, verbose: bool) -> Result<(), ()> {
-    compile_and_test(exercise, RunMode::NonInteractive, verbose)?;
+    compile_and_test(exercise, RunMode::NonInteractive, verbose, false)?;
    Ok(())
 }

 // Invoke the rust compiler without running the resulting binary
-fn compile_only(exercise: &Exercise) -> Result<bool, ()> {
+fn compile_only(exercise: &Exercise, success_hints: bool) -> Result<bool, ()> {
    let progress_bar = ProgressBar::new_spinner();
    progress_bar.set_message(format!("Compiling {exercise}..."));
    progress_bar.enable_steady_tick(100);
@@ -59,11 +60,11 @@ fn compile_only(exercise: &Exercise) -> Result<bool, ()> {
    let _ = compile(exercise, &progress_bar)?;
    progress_bar.finish_and_clear();

-    Ok(prompt_for_completion(exercise, None))
+    Ok(prompt_for_completion(exercise, None, success_hints))
 }

 // Compile the given Exercise and run the resulting binary in an interactive mode
-fn compile_and_run_interactively(exercise: &Exercise) -> Result<bool, ()> {
+fn compile_and_run_interactively(exercise: &Exercise, success_hints: bool) -> Result<bool, ()> {
    let progress_bar = ProgressBar::new_spinner();
    progress_bar.set_message(format!("Compiling {exercise}..."));
    progress_bar.enable_steady_tick(100);
@@ -84,12 +85,12 @@ fn compile_and_run_interactively(exercise: &Exercise) -> Result<bool, ()> {
        }
    };

-    Ok(prompt_for_completion(exercise, Some(output.stdout)))
+    Ok(prompt_for_completion(exercise, Some(output.stdout), success_hints))
 }

 // Compile the given Exercise as a test harness and display
 // the output if verbose is set to true
-fn compile_and_test(exercise: &Exercise, run_mode: RunMode, verbose: bool) -> Result<bool, ()> {
+fn compile_and_test(exercise: &Exercise, run_mode: RunMode, verbose: bool, success_hints: bool) -> Result<bool, ()> {
    let progress_bar = ProgressBar::new_spinner();
    progress_bar.set_message(format!("Testing {exercise}..."));
    progress_bar.enable_steady_tick(100);
@@ -104,7 +105,7 @@ fn compile_and_test(exercise: &Exercise, run_mode: RunMode, verbose: bool) -> Re
                println!("{}", output.stdout);
            }
            if let RunMode::Interactive = run_mode {
-                Ok(prompt_for_completion(exercise, None))
+                Ok(prompt_for_completion(exercise, None, success_hints))
            } else {
                Ok(true)
            }
@@ -142,12 +143,11 @@ fn compile<'a, 'b>(
    }
 }

-fn prompt_for_completion(exercise: &Exercise, prompt_output: Option<String>) -> bool {
+fn prompt_for_completion(exercise: &Exercise, prompt_output: Option<String>, success_hints: bool) -> bool {
    let context = match exercise.state() {
        State::Done => return true,
        State::Pending(context) => context,
    };
-
    match exercise.mode {
        Mode::Compile => success!("Successfully ran {}!", exercise),
        Mode::Test => success!("Successfully tested {}!", exercise),
@@ -167,7 +167,6 @@ fn prompt_for_completion(exercise: &Exercise, prompt_output: Option<String>) ->
        Mode::Test => "The code is compiling, and the tests pass!",
        Mode::Clippy => clippy_success_msg,
    };
-
    println!();
    if no_emoji {
        println!("~*~ {success_msg} ~*~")
@@ -183,6 +182,13 @@ fn prompt_for_completion(exercise: &Exercise, prompt_output: Option<String>) ->
        println!("{}", separator());
        println!();
    }
+    if success_hints {
+        println!("Hints:");
+        println!("{}", separator());
+        println!("{}", exercise.hint);
+        println!("{}", separator());
+        println!();
+    }

    println!("You can keep working on this exercise,");
    println!(