.all-contributorsrc

@@ -1884,24 +1884,6 @@
       "contributions": [
         "infra"
       ]
-    },
-    {
-      "login": "nidhalmessaoudi",
-      "name": "Nidhal Messaoudi",
-      "avatar_url": "https://avatars.githubusercontent.com/u/63377412?v=4",
-      "profile": "https://nidhalmessaoudi.herokuapp.com",
-      "contributions": [
-        "code"
-      ]
-    },
-    {
-      "login": "MahdiBM",
-      "name": "Mahdi Bahrami",
-      "avatar_url": "https://avatars.githubusercontent.com/u/54685446?v=4",
-      "profile": "https://github.com/MahdiBM",
-      "contributions": [
-        "tool"
-      ]
     }
   ],
   "contributorsPerLine": 8,

AUTHORS.md

@@ -267,8 +267,6 @@ authors.
       <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>
   </tbody>
 </table>

CHANGELOG.md

@@ -1,19 +1,3 @@
-<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)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustlings"
-version = "5.4.1"
+version = "5.4.0"
 authors = [
   "Liv <mokou@fastmail.com>",
   "Carol (Nichols || Goulding) <carol.nichols@gmail.com>",

README.md

@@ -33,8 +33,8 @@ 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 5.4.1)
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
-git clone -b 5.4.1 --depth 1 https://github.com/rust-lang/rustlings
+git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
 cd rustlings
 # if nix version > 2.3
 nix develop
@@ -71,8 +71,8 @@ If you get a permission denied message, you might have to exclude the directory
 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 5.4.1)
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
-git clone -b 5.4.1 --depth 1 https://github.com/rust-lang/rustlings
+git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
 cd rustlings
 cargo install --force --path .
 ```

exercises/enums/enums1.rs

@@ -1,14 +1,11 @@
 // enums1.rs
 // No hints this time! ;)
 
+// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
     // TODO: define a few types of messages as used below
-    Quit,
-    Echo,
-    Move,
-    ChangeColor,
 }
 
 fn main() {

exercises/enums/enums2.rs

@@ -1,14 +1,11 @@
 // enums2.rs
 // Execute `rustlings hint enums2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
     // TODO: define the different variants used below
-    Move{x: u16, y: u16},
-    Echo(String),
-    ChangeColor(u16, u16, u16),
-    Quit,
 }
 
 impl Message {

exercises/enums/enums3.rs

@@ -2,13 +2,10 @@
 // Address all the TODOs to make the tests pass!
 // Execute `rustlings hint enums3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 enum Message {
     // TODO: implement the message variant types based on their usage below
-    ChangeColor((u8, u8, u8)),
-    Echo(String),
-    Move(Point),
-    Quit,
 }
 
 struct Point {
@@ -42,12 +39,6 @@ impl State {
     fn process(&mut self, message: Message) {
         // TODO: create a match expression to process the different message variants
         // Remember: When passing a tuple as a function argument, you'll need extra parentheses: fn function((t, u, p, l, e))
-        match message {
-            Message::ChangeColor(color) => self.change_color(color),
-            Message::Echo(string) => self.echo(string),
-            Message::Move(point) => self.move_position(point),
-            Message::Quit => self.quit(),
-        }
     }
 }
 
@@ -62,7 +53,7 @@ mod tests {
             position: Point { x: 0, y: 0 },
             color: (0, 0, 0),
         };
-        state.process(Message::ChangeColor((255, 0, 255)));
+        state.process(Message::ChangeColor(255, 0, 255));
         state.process(Message::Echo(String::from("hello world")));
         state.process(Message::Move(Point { x: 10, y: 15 }));
         state.process(Message::Quit);

exercises/error_handling/errors1.rs

@@ -5,13 +5,14 @@
 // construct to `Option` that can be used to express error conditions. Let's use it!
 // Execute `rustlings hint errors1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
-pub fn generate_nametag_text(name: String) -> Result<String, String> {
+pub fn generate_nametag_text(name: String) -> Option<String> {
     if name.is_empty() {
         // Empty names aren't allowed.
-        Err("`name` was empty; it must be nonempty.".into())
+        None
     } else {
-        Ok(format!("Hi! My name is {}", name))
+        Some(format!("Hi! My name is {}", name))
     }
 }
 

exercises/error_handling/errors2.rs

@@ -17,13 +17,14 @@
 // one is a lot shorter!
 // Execute `rustlings hint errors2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::num::ParseIntError;
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;
-    let qty = item_quantity.parse::<i32>()?;
+    let qty = item_quantity.parse::<i32>();
 
     Ok(qty * cost_per_item + processing_fee)
 }

exercises/error_handling/errors3.rs

@@ -4,10 +4,11 @@
 // Why not? What should we do to fix it?
 // Execute `rustlings hint errors3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::num::ParseIntError;
 
-fn main() -> Result<(), ParseIntError> {
+fn main() {
     let mut tokens = 100;
     let pretend_user_input = "8";
 
@@ -19,7 +20,6 @@ fn main() -> Result<(), ParseIntError> {
         tokens -= cost;
         println!("You now have {} tokens.", tokens);
     }
-    Ok(())
 }
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {

exercises/error_handling/errors4.rs

@@ -1,6 +1,7 @@
 // errors4.rs
 // Execute `rustlings hint errors4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
@@ -14,8 +15,6 @@ enum CreationError {
 impl PositiveNonzeroInteger {
     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
         // Hmm...? Why is this only returning an Ok value?
-        if value < 0 { return Err(CreationError::Negative); }
-        if value == 0 { return Err(CreationError::Zero); } 
         Ok(PositiveNonzeroInteger(value as u64))
     }
 }

exercises/error_handling/errors5.rs

@@ -16,13 +16,14 @@
 
 // Execute `rustlings hint errors5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::error;
 use std::fmt;
 use std::num::ParseIntError;
 
 // TODO: update the return type of `main()` to make this compile.
-fn main() -> Result<(), Box<dyn error::Error>> {
+fn main() -> Result<(), Box<dyn ???>> {
     let pretend_user_input = "42";
     let x: i64 = pretend_user_input.parse()?;
     println!("output={:?}", PositiveNonzeroInteger::new(x)?);

exercises/error_handling/errors6.rs

@@ -8,6 +8,7 @@
 
 // Execute `rustlings hint errors6` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::num::ParseIntError;
 
@@ -24,15 +25,12 @@ impl ParsePosNonzeroError {
     }
     // TODO: add another error conversion function here.
     // fn from_parseint...
-    fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
-        ParsePosNonzeroError::ParseInt(err)
-    }
 }
 
 fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
     // TODO: change this to return an appropriate error instead of panicking
     // when `parse()` returns an error.
-    let x: i64 = s.parse().map_err(ParsePosNonzeroError::from_parseint)?;
+    let x: i64 = s.parse().unwrap();
     PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation)
 }
 

exercises/functions/functions1.rs

@@ -1,11 +1,8 @@
 // functions1.rs
 // Execute `rustlings hint functions1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     call_me();
 }
-
-fn call_me() {
-    print!("Called");
-}

exercises/functions/functions2.rs

@@ -1,12 +1,13 @@
 // functions2.rs
 // Execute `rustlings hint functions2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    call_me(5);
+    call_me(3);
 }
 
-fn call_me(num: i16) {
+fn call_me(num:) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }

exercises/functions/functions3.rs

@@ -1,9 +1,10 @@
 // functions3.rs
 // Execute `rustlings hint functions3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    call_me(3);
+    call_me();
 }
 
 fn call_me(num: u32) {

exercises/functions/functions4.rs

@@ -7,20 +7,21 @@
 // in the signatures for now. If anything, this is a good way to peek ahead
 // to future exercises!)
 
+// I AM NOT DONE
 
 fn main() {
-    let original_price: u32 = 51;
+    let original_price = 51;
     println!("Your sale price is {}", sale_price(original_price));
 }
 
-fn sale_price(price: u32) -> u32 {
+fn sale_price(price: i32) -> {
-    if (price % 2 == 0) {
+    if is_even(price) {
         price - 10
     } else {
         price - 3
     }
 }
 
-fn is_even(num: u32) -> bool {
+fn is_even(num: i32) -> bool {
     num % 2 == 0
 }

exercises/functions/functions5.rs

@@ -1,6 +1,7 @@
 // functions5.rs
 // Execute `rustlings hint functions5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let answer = square(3);
@@ -8,5 +9,5 @@ fn main() {
 }
 
 fn square(num: i32) -> i32 {
-    return num * num;
+    num * num;
 }

exercises/generics/generics1.rs

@@ -3,8 +3,9 @@
 
 // Execute `rustlings hint generics1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let mut shopping_list: Vec<&str> = Vec::new();
+    let mut shopping_list: Vec<?> = Vec::new();
     shopping_list.push("milk");
 }

exercises/generics/generics2.rs

@@ -3,13 +3,14 @@
 
 // Execute `rustlings hint generics2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
-struct Wrapper<T> {
+struct Wrapper {
-    value: T,
+    value: u32,
 }
 
-impl<T> Wrapper<T> {
+impl Wrapper {
-    pub fn new(value: T) -> Self {
+    pub fn new(value: u32) -> Self {
         Wrapper { value }
     }
 }

exercises/hashmaps/hashmaps1.rs

@@ -10,18 +10,17 @@
 //
 // Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
 fn fruit_basket() -> HashMap<String, u32> {
-    let mut basket = HashMap::new();// TODO: declare your hash map here.
+    let mut basket = // TODO: declare your hash map here.
 
     // Two bananas are already given for you :)
     basket.insert(String::from("banana"), 2);
 
     // TODO: Put more fruits in your basket here.
-    basket.insert(String::from("apple"), 1);
-    basket.insert(String::from("orange"), 2);
 
     basket
 }

exercises/hashmaps/hashmaps2.rs

@@ -11,6 +11,7 @@
 //
 // Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -36,7 +37,6 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // TODO: Put new fruits if not already present. Note that you
         // are not allowed to put any type of fruit that's already
         // present!
-        basket.entry(fruit).or_insert(1);
     }
 }
 

exercises/hashmaps/hashmaps3.rs

@@ -14,6 +14,7 @@
 
 // Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -39,26 +40,6 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
         // will be the number of goals conceded from team_2, and similarly
         // goals scored by team_2 will be the number of goals conceded by
         // team_1.
-        scores.entry(team_1_name.clone())
-            .and_modify(|e| {
-                e.goals_scored += team_1_score;
-                e.goals_conceded += team_2_score;
-            })
-            .or_insert(Team {
-                name: team_1_name,
-                goals_scored: team_1_score,
-                goals_conceded: team_2_score,
-            });
-        scores.entry(team_2_name.clone())
-            .and_modify(|e| {
-                e.goals_scored += team_2_score;
-                e.goals_conceded += team_1_score;
-            })
-            .or_insert(Team {
-                name: team_2_name,
-                goals_scored: team_2_score,
-                goals_conceded: team_1_score,
-            });
     }
     scores
 }

exercises/if/if1.rs

@@ -1,14 +1,13 @@
 // if1.rs
 // Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 pub fn bigger(a: i32, b: i32) -> i32 {
     // Complete this function to return the bigger number!
     // Do not use:
     // - another function call
     // - additional variables
-    if (a > b) { return a; }
-    return b;
 }
 
 // Don't mind this for now :)

exercises/if/if2.rs

@@ -4,14 +4,13 @@
 // Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
 // Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 pub fn foo_if_fizz(fizzish: &str) -> &str {
     if fizzish == "fizz" {
-        return "foo";
+        "foo"
-    } else if (fizzish == "fuzz") {
-        return "bar";
     } else {
-        return "baz";
+        1
     }
 }
 

exercises/intro/intro1.rs

@@ -9,6 +9,8 @@
 // when you change one of the lines below! Try adding a `println!` line, or try changing
 // what it outputs in your terminal. Try removing a semicolon and see what happens!
 
+// I AM NOT DONE
+
 fn main() {
     println!("Hello and");
     println!(r#"       welcome to...                      "#);

exercises/intro/intro2.rs

@@ -2,6 +2,8 @@
 // Make the code print a greeting to the world.
 // Execute `rustlings hint intro2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    println!("Hello {}!", "world");
+    println!("Hello {}!");
 }

exercises/modules/modules1.rs

@@ -1,6 +1,7 @@
 // modules1.rs
 // Execute `rustlings hint modules1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 mod sausage_factory {
     // Don't let anybody outside of this module see this!
@@ -8,7 +9,7 @@ mod sausage_factory {
         String::from("Ginger")
     }
 
-    pub fn make_sausage() {
+    fn make_sausage() {
         get_secret_recipe();
         println!("sausage!");
     }

exercises/modules/modules2.rs

@@ -3,11 +3,12 @@
 // 'use' and 'as' keywords. Fix these 'use' statements to make the code compile.
 // Execute `rustlings hint modules2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 mod delicious_snacks {
     // TODO: Fix these use statements
-    pub use self::fruits::PEAR as fruit;
+    use self::fruits::PEAR as ???
-    pub use self::veggies::CUCUMBER as veggie;
+    use self::veggies::CUCUMBER as ???
 
     mod fruits {
         pub const PEAR: &'static str = "Pear";

exercises/modules/modules3.rs

@@ -5,9 +5,10 @@
 // from the std::time module. Bonus style points if you can do it with one line!
 // Execute `rustlings hint modules3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 // TODO: Complete this use statement
-use std::time::{SystemTime, UNIX_EPOCH};
+use ???
 
 fn main() {
     match SystemTime::now().duration_since(UNIX_EPOCH) {

exercises/move_semantics/move_semantics1.rs

@@ -1,10 +1,12 @@
 // move_semantics1.rs
 // Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
-    let mut vec1 = fill_vec(vec0);
+    let vec1 = fill_vec(vec0);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 

exercises/move_semantics/move_semantics2.rs

@@ -2,11 +2,12 @@
 // 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.
 
+// I AM NOT DONE
 
 fn main() {
     let vec0 = Vec::new();
 
-    let mut vec1 = fill_vec(&vec0);
+    let mut vec1 = fill_vec(vec0);
 
     // Do not change the following line!
     println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
@@ -16,8 +17,8 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(vec: &Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let mut vec = vec.clone();
+    let mut vec = vec;
 
     vec.push(22);
     vec.push(44);

exercises/move_semantics/move_semantics3.rs

@@ -3,6 +3,7 @@
 // (no lines with multiple semicolons necessary!)
 // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let vec0 = Vec::new();
@@ -16,7 +17,7 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     vec.push(22);
     vec.push(44);
     vec.push(66);

exercises/move_semantics/move_semantics4.rs

@@ -4,10 +4,12 @@
 // function.
 // Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
+    let vec0 = Vec::new();
 
-    let mut vec1 = fill_vec();
+    let mut vec1 = fill_vec(vec0);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 
@@ -18,7 +20,7 @@ fn main() {
 
 // `fill_vec()` no longer takes `vec: Vec<i32>` as argument
 fn fill_vec() -> Vec<i32> {
-    let mut vec = Vec::new();
+    let mut vec = vec;
 
     vec.push(22);
     vec.push(44);

exercises/move_semantics/move_semantics5.rs

@@ -3,12 +3,13 @@
 // adding, changing or removing any of them.
 // Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let mut x = 100;
     let y = &mut x;
-    *y += 100;
     let z = &mut x;
+    *y += 100;
     *z += 1000;
     assert_eq!(x, 1200);
 }

exercises/move_semantics/move_semantics6.rs

@@ -2,22 +2,24 @@
 // Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand for a hint.
 // You can't change anything except adding or removing references.
 
+// I AM NOT DONE
+
 fn main() {
     let data = "Rust is great!".to_string();
 
-    get_char(&data);
+    get_char(data);
 
-    string_uppercase(data);
+    string_uppercase(&data);
 }
 
 // Should not take ownership
-fn get_char(data: &String) -> char {
+fn get_char(data: String) -> char {
     data.chars().last().unwrap()
 }
 
 // Should take ownership
-fn string_uppercase(mut data: String) {
+fn string_uppercase(mut data: &String) {
-    data = data.to_uppercase();
+    data = &data.to_uppercase();
 
     println!("{}", data);
 }

exercises/options/options1.rs

@@ -1,6 +1,7 @@
 // options1.rs
 // Execute `rustlings hint options1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 // This function returns how much icecream there is left in the fridge.
 // If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
@@ -9,9 +10,7 @@ fn maybe_icecream(time_of_day: u16) -> Option<u16> {
     // We use the 24-hour system here, so 10PM is a value of 22 and 12AM is a value of 0
     // The Option output should gracefully handle cases where time_of_day > 23.
     // TODO: Complete the function body - remember to return an Option!
-    if time_of_day < 22 { return Some(5); }
+    ???
-    if time_of_day <= 23 { return Some(0); }
-    None
 }
 
 #[cfg(test)]
@@ -30,7 +29,7 @@ mod tests {
     #[test]
     fn raw_value() {
         // TODO: Fix this test. How do you get at the value contained in the Option?
-        let icecreams = maybe_icecream(12).unwrap();
+        let icecreams = maybe_icecream(12);
         assert_eq!(icecreams, 5);
     }
 }

exercises/options/options2.rs

@@ -1,6 +1,7 @@
 // options2.rs
 // Execute `rustlings hint options2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
@@ -10,7 +11,7 @@ mod tests {
         let optional_target = Some(target);
 
         // TODO: Make this an if let statement whose value is "Some" type
-        if let Some(word) = optional_target {
+        word = optional_target {
             assert_eq!(word, target);
         }
     }
@@ -25,7 +26,7 @@ mod tests {
 
         // 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
-        while let Some(Some(integer)) = optional_integers.pop() {
+        integer = optional_integers.pop() {
             assert_eq!(integer, range);
             range -= 1;
         }

exercises/options/options3.rs

@@ -1,6 +1,7 @@
 // options3.rs
 // Execute `rustlings hint options3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 struct Point {
     x: i32,
@@ -11,7 +12,7 @@ fn main() {
     let y: Option<Point> = Some(Point { x: 100, y: 200 });
 
     match y {
-        Some(ref p) => println!("Co-ordinates are {},{} ", p.x, p.y),
+        Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),
         _ => println!("no match"),
     }
     y; // Fix without deleting this line.

exercises/primitive_types/primitive_types1.rs

@@ -2,6 +2,7 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
+// I AM NOT DONE
 
 fn main() {
     // Booleans (`bool`)
@@ -11,7 +12,7 @@ fn main() {
         println!("Good morning!");
     }
 
-    let is_evening: bool = true;// Finish the rest of this line like the example! Or make it be false!
+    let // Finish the rest of this line like the example! Or make it be false!
     if is_evening {
         println!("Good evening!");
     }

exercises/primitive_types/primitive_types2.rs

@@ -2,6 +2,7 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
+// I AM NOT DONE
 
 fn main() {
     // Characters (`char`)
@@ -17,7 +18,7 @@ fn main() {
         println!("Neither alphabetic nor numeric!");
     }
 
-    let your_character: char = '!';// Finish this line like the example! What's your favorite character?
+    let // Finish this line like the example! What's your favorite character?
     // Try a letter, try a number, try a special character, try a character
     // from a different language than your own, try an emoji!
     if your_character.is_alphabetic() {

exercises/primitive_types/primitive_types3.rs

@@ -2,14 +2,14 @@
 // Create an array with at least 100 elements in it where the ??? is.
 // Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let a: [i32; 101] = [1; 101];
+    let a = ???
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");
     } else {
         println!("Meh, I eat arrays like that for breakfast.");
     }
-    println!("Array index 100: {}", a[100]);
 }

exercises/primitive_types/primitive_types4.rs

@@ -2,12 +2,13 @@
 // Get a slice out of Array a where the ??? is so that the test passes.
 // Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[test]
 fn slice_out_of_array() {
     let a = [1, 2, 3, 4, 5];
 
-    let nice_slice = &a[1..4];
+    let nice_slice = ???
 
     assert_eq!([2, 3, 4], nice_slice)
 }

exercises/primitive_types/primitive_types5.rs

@@ -2,11 +2,11 @@
 // Destructure the `cat` tuple so that the println will work.
 // Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let cat = ("Furry McFurson", 3.5);
-    let name = cat.0;
+    let /* your pattern here */ = cat;
-    let age = cat.1;
 
     println!("{} is {} years old.", name, age);
 }

exercises/primitive_types/primitive_types6.rs

@@ -3,12 +3,13 @@
 // You can put the expression for the second element where ??? is so that the test passes.
 // Execute `rustlings hint primitive_types6` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[test]
 fn indexing_tuple() {
     let numbers = (1, 2, 3);
     // Replace below ??? with the tuple indexing syntax.
-    let second = numbers.1; 
+    let second = ???;
 
     assert_eq!(2, second,
         "This is not the 2nd number in the tuple!")

exercises/quiz1.rs

@@ -10,13 +10,10 @@
 // Write a function that calculates the price of an order of apples given
 // the quantity bought. No hints this time!
 
+// I AM NOT DONE
 
 // Put your function here!
 // fn calculate_price_of_apples {
-fn calculate_price_of_apples(appleAmount: u32) -> u32 {
-    if (appleAmount > 40) { return appleAmount * 1;}
-    return (appleAmount * 2);
-}
 
 // Don't modify this function!
 #[test]

exercises/quiz2.rs

@@ -18,6 +18,7 @@
 // - The output element is going to be a Vector of strings.
 // No hints this time!
 
+// I AM NOT DONE
 
 pub enum Command {
     Uppercase,
@@ -29,20 +30,11 @@ mod my_module {
     use super::Command;
 
     // TODO: Complete the function signature!
-    pub fn transformer(input: Vec<(String, Command)>) -> Vec<String> {
+    pub fn transformer(input: ???) -> ??? {
         // TODO: Complete the output declaration!
-        let mut output: Vec<String> = vec![];
+        let mut output: ??? = vec![];
         for (string, command) in input.iter() {
             // TODO: Complete the function body. You can do it!
-            match command {
-                Command::Uppercase => output.push(string.to_uppercase()),
-                Command::Trim => output.push(string.trim().to_string()),
-                Command::Append(size) => {
-                    let mut newString: String = string.to_string();
-                    newString.push_str("bar".repeat(*size).as_str());
-                    output.push(newString.to_string());
-                },
-            }
         }
         output
     }
@@ -51,7 +43,7 @@ mod my_module {
 #[cfg(test)]
 mod tests {
     // TODO: What do we need to import to have `transformer` in scope?
-    use crate::my_module::transformer;
+    use ???;
     use super::Command;
 
     #[test]

exercises/strings/strings1.rs

@@ -2,6 +2,7 @@
 // Make me compile without changing the function signature!
 // Execute `rustlings hint strings1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let answer = current_favorite_color();
@@ -9,5 +10,5 @@ fn main() {
 }
 
 fn current_favorite_color() -> String {
-    String::from("blue")
+    "blue"
 }

exercises/strings/strings2.rs

@@ -2,9 +2,11 @@
 // Make me compile without changing the function signature!
 // Execute `rustlings hint strings2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let word = String::from("green"); // Try not changing this line :)
-    if is_a_color_word(&word) {
+    if is_a_color_word(word) {
         println!("That is a color word I know!");
     } else {
         println!("That is not a color word I know.");

exercises/strings/strings3.rs

@@ -1,20 +1,21 @@
 // strings3.rs
 // Execute `rustlings hint strings3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn trim_me(input: &str) -> String {
     // TODO: Remove whitespace from both ends of a string!
-    input.trim().to_string()
+    ???
 }
 
 fn compose_me(input: &str) -> String {
     // TODO: Add " world!" to the string! There's multiple ways to do this!
-    input.to_string() + " world!"
+    ???
 }
 
 fn replace_me(input: &str) -> String {
     // TODO: Replace "cars" in the string with "balloons"!
-    input.replace("cars", "balloons").to_string()
+    ???
 }
 
 #[cfg(test)]

exercises/strings/strings4.rs

@@ -6,6 +6,7 @@
 // before the parentheses on each line. If you're right, it will compile!
 // No hints this time!
 
+// I AM NOT DONE
 
 fn string_slice(arg: &str) {
     println!("{}", arg);
@@ -15,14 +16,14 @@ fn string(arg: String) {
 }
 
 fn main() {
-    string_slice("blue");
+    ???("blue");
-    string("red".to_string());
+    ???("red".to_string());
-    string(String::from("hi"));
+    ???(String::from("hi"));
-    string("rust is fun!".to_owned());
+    ???("rust is fun!".to_owned());
-    string("nice weather".into());
+    ???("nice weather".into());
-    string(format!("Interpolation {}", "Station"));
+    ???(format!("Interpolation {}", "Station"));
-    string_slice(&String::from("abc")[0..1]);
+    ???(&String::from("abc")[0..1]);
-    string_slice("  hello there ".trim());
+    ???("  hello there ".trim());
-    string("Happy Monday!".to_string().replace("Mon", "Tues"));
+    ???("Happy Monday!".to_string().replace("Mon", "Tues"));
-    string("mY sHiFt KeY iS sTiCkY".to_lowercase());
+    ???("mY sHiFt KeY iS sTiCkY".to_lowercase());
 }

exercises/structs/structs1.rs

@@ -2,15 +2,13 @@
 // Address all the TODOs to make the tests pass!
 // Execute `rustlings hint structs1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 struct ColorClassicStruct {
     // TODO: Something goes here
-    red: u16,
-    green: u16,
-    blue: u16,
 }
 
-struct ColorTupleStruct(u16, u16, u16/* TODO: Something goes here */);
+struct ColorTupleStruct(/* TODO: Something goes here */);
 
 #[derive(Debug)]
 struct UnitLikeStruct;
@@ -22,7 +20,7 @@ mod tests {
     #[test]
     fn classic_c_structs() {
         // TODO: Instantiate a classic c struct!
-        let green = ColorClassicStruct{red: 0, green: 255, blue: 0};
+        // let green =
 
         assert_eq!(green.red, 0);
         assert_eq!(green.green, 255);
@@ -32,7 +30,7 @@ mod tests {
     #[test]
     fn tuple_structs() {
         // TODO: Instantiate a tuple struct!
-        let green = ColorTupleStruct(0, 255, 0);
+        // let green =
 
         assert_eq!(green.0, 0);
         assert_eq!(green.1, 255);
@@ -42,7 +40,7 @@ mod tests {
     #[test]
     fn unit_structs() {
         // TODO: Instantiate a unit-like struct!
-        let unit_like_struct = UnitLikeStruct;
+        // let unit_like_struct =
         let message = format!("{:?}s are fun!", unit_like_struct);
 
         assert_eq!(message, "UnitLikeStructs are fun!");

exercises/structs/structs2.rs

@@ -2,6 +2,8 @@
 // Address all the TODOs to make the tests pass!
 // Execute `rustlings hint structs2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 #[derive(Debug)]
 struct Order {
     name: String,
@@ -33,11 +35,7 @@ mod tests {
     fn your_order() {
         let order_template = create_order_template();
         // TODO: Create your own order using the update syntax and template above!
-        let your_order = Order {
+        // let your_order =
-            name: "Hacker in Rust".to_string(),
-            count: 1,
-            ..create_order_template()
-        };
         assert_eq!(your_order.name, "Hacker in Rust");
         assert_eq!(your_order.year, order_template.year);
         assert_eq!(your_order.made_by_phone, order_template.made_by_phone);

exercises/structs/structs3.rs

@@ -4,6 +4,7 @@
 // Make the code compile and the tests pass!
 // Execute `rustlings hint structs3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 #[derive(Debug)]
 struct Package {
@@ -25,14 +26,12 @@ impl Package {
         }
     }
 
-    fn is_international(&self) -> bool {
+    fn is_international(&self) -> ??? {
         // Something goes here...
-        self.sender_country != self.recipient_country 
     }
 
-    fn get_fees(&self, cents_per_gram: i32) -> i32{
+    fn get_fees(&self, cents_per_gram: i32) -> ??? {
         // Something goes here...
-        self.weight_in_grams * cents_per_gram
     }
 }
 

exercises/traits/traits1.rs

@@ -9,6 +9,7 @@
 // implementing this trait.
 // Execute `rustlings hint traits1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 trait AppendBar {
     fn append_bar(self) -> Self;
@@ -16,9 +17,6 @@ trait AppendBar {
 
 impl AppendBar for String {
     // TODO: Implement `AppendBar` for type `String`.
-    fn append_bar(self) -> Self {
-        format!("{}Bar", self)
-    }
 }
 
 fn main() {

exercises/traits/traits2.rs

@@ -11,18 +11,13 @@
 // you can do this!
 // Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 trait AppendBar {
     fn append_bar(self) -> Self;
 }
 
 // TODO: Implement trait `AppendBar` for a vector of strings.
-impl AppendBar for Vec<String> {
-    fn append_bar(mut self) -> Self {
-        self.push(String::from("Bar"));
-        self
-    }
-}
 
 #[cfg(test)]
 mod tests {

exercises/variables/variables1.rs

@@ -2,8 +2,9 @@
 // Make me compile!
 // Execute `rustlings hint variables1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let x = 5;
+    x = 5;
     println!("x has the value {}", x);
 }

exercises/variables/variables2.rs

@@ -1,9 +1,10 @@
 // variables2.rs
 // Execute `rustlings hint variables2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let x: i32 = 10;
+    let x;
     if x == 10 {
         println!("x is ten!");
     } else {

exercises/variables/variables3.rs

@@ -1,9 +1,9 @@
 // variables3.rs
 // Execute `rustlings hint variables3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let x: i32 = 0;
+    let x: i32;
-    let y: u16 = u16::MAX;
+    println!("Number {}", x);
-    println!("Number {} and {}", x, y);
 }

exercises/variables/variables4.rs

@@ -1,9 +1,10 @@
 // variables4.rs
 // Execute `rustlings hint variables4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
-    let mut x = 3;
+    let x = 3;
     println!("Number {}", x);
     x = 5; // don't change this line
     println!("Number {}", x);

exercises/variables/variables5.rs

@@ -1,10 +1,11 @@
 // variables5.rs
 // Execute `rustlings hint variables5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn main() {
     let number = "T-H-R-E-E"; // don't change this line
     println!("Spell a Number : {}", number);
-    let number = 3; // don't rename this variable
+    number = 3; // don't rename this variable
     println!("Number plus two is : {}", number + 2);
 }

exercises/variables/variables6.rs

@@ -1,8 +1,9 @@
 // variables6.rs
 // Execute `rustlings hint variables6` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
-const NUMBER: i16 = 3;
+const NUMBER = 3;
 fn main() {
     println!("Number {}", NUMBER);
 }

exercises/vecs/vecs1.rs

@@ -4,12 +4,13 @@
 // Make me compile and pass the test!
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = vec![10, 20, 30, 40];// TODO: declare your vector here with the macro for vectors
+    let v = // TODO: declare your vector here with the macro for vectors
 
-    return (a, v);
+    (a, v)
 }
 
 #[cfg(test)]

exercises/vecs/vecs2.rs

@@ -6,12 +6,13 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
 
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for i in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is
         // multiplied by 2.
-        *i = *i * 2;
+        ???
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].
@@ -22,7 +23,7 @@ fn vec_map(v: &Vec<i32>) -> Vec<i32> {
     v.iter().map(|num| {
         // TODO: Do the same thing as above - but instead of mutating the
         // Vec, you can just return the new number!
-        return *num * 2;
+        ???
     }).collect()
 }
 

flake.nix

@@ -22,7 +22,7 @@
         rustlings =
           pkgs.rustPlatform.buildRustPackage {
             name = "rustlings";
-            version = "5.4.1";
+            version = "5.4.0";
 
             buildInputs = cargoBuildInputs;
 

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

src/main.rs

@@ -26,7 +26,7 @@ mod run;
 mod verify;
 
 // In sync with crate version
-const VERSION: &str = "5.4.1";
+const VERSION: &str = "5.4.0";
 
 #[derive(FromArgs, PartialEq, Debug)]
 /// Rustlings is a collection of small exercises to get you used to writing and reading Rust code