Revert "done"

This reverts commit 817f262b7b41e62ea36e58b02f00dccfdf14fba8.

exercises/00_intro/intro1.rs

@@ -13,7 +13,7 @@
 // Execute `rustlings hint intro1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     println!("Hello and");

exercises/00_intro/intro2.rs

@@ -5,8 +5,8 @@
 // Execute `rustlings hint intro2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
-    println!("Hello there!")
+    printline!("Hello there!")
 }

exercises/01_variables/variables1.rs

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

exercises/01_variables/variables2.rs

@@ -3,10 +3,10 @@
 // Execute `rustlings hint variables2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
-    let x = 0;
+    let x;
     if x == 10 {
         println!("x is ten!");
     } else {

exercises/01_variables/variables3.rs

@@ -3,9 +3,9 @@
 // Execute `rustlings hint variables3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
-    let x: i32 = 0;
+    let x: i32;
     println!("Number {}", x);
 }

exercises/01_variables/variables4.rs

@@ -3,10 +3,10 @@
 // Execute `rustlings hint variables4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/01_variables/variables5.rs

@@ -3,11 +3,11 @@
 // Execute `rustlings hint variables5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/01_variables/variables6.rs

@@ -3,9 +3,9 @@
 // Execute `rustlings hint variables6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-const NUMBER: i32 = 3;
+const NUMBER = 3;
 fn main() {
     println!("Number {}", NUMBER);
 }

exercises/02_functions/functions1.rs

@@ -3,12 +3,8 @@
 // Execute `rustlings hint functions1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     call_me();
 }
-
-fn call_me() {
-    // todo!()
-}

exercises/02_functions/functions2.rs

@@ -3,13 +3,13 @@
 // Execute `rustlings hint functions2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     call_me(3);
 }
 
-fn call_me(num: i32) {
+fn call_me(num:) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }

exercises/02_functions/functions3.rs

@@ -3,10 +3,10 @@
 // Execute `rustlings hint functions3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
-    call_me(0);
+    call_me();
 }
 
 fn call_me(num: u32) {

exercises/02_functions/functions4.rs

@@ -8,14 +8,14 @@
 // Execute `rustlings hint functions4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     let original_price = 51;
     println!("Your sale price is {}", sale_price(original_price));
 }
 
-fn sale_price(price: i32) -> i32 {
+fn sale_price(price: i32) -> {
     if is_even(price) {
         price - 10
     } else {

exercises/02_functions/functions5.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint functions5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     let answer = square(3);
@@ -11,5 +11,5 @@ fn main() {
 }
 
 fn square(num: i32) -> i32 {
-    num * num
+    num * num;
 }

exercises/03_if/if1.rs

@@ -2,10 +2,13 @@
 //
 // Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub fn bigger(a: i32, b: i32) -> i32 {
-    if a > b { a } else { b }
+    // Complete this function to return the bigger number!
+    // Do not use:
+    // - another function call
+    // - additional variables
 }
 
 // Don't mind this for now :)

exercises/03_if/if2.rs

@@ -5,15 +5,13 @@
 //
 // Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub fn foo_if_fizz(fizzish: &str) -> &str {
     if fizzish == "fizz" {
         "foo"
-    } else if fizzish == "fuzz" {
-        "bar"
     } else {
-        "baz"
+        1
     }
 }
 

exercises/03_if/if3.rs

@@ -2,17 +2,17 @@
 //
 // Execute `rustlings hint if3` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub fn animal_habitat(animal: &str) -> &'static str {
     let identifier = if animal == "crab" {
         1
     } else if animal == "gopher" {
-        2
+        2.0
     } else if animal == "snake" {
         3
     } else {
-        0
+        "Unknown"
     };
 
     // DO NOT CHANGE THIS STATEMENT BELOW

exercises/04_primitive_types/primitive_types1.rs

@@ -3,7 +3,7 @@
 // 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  DONE
+// I AM NOT DONE
 
 fn main() {
     // Booleans (`bool`)
@@ -13,7 +13,7 @@ fn main() {
         println!("Good morning!");
     }
 
-    let is_evening = false; // 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/04_primitive_types/primitive_types2.rs

@@ -3,7 +3,7 @@
 // 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  DONE
+// I AM NOT DONE
 
 fn main() {
     // Characters (`char`)
@@ -19,7 +19,7 @@ fn main() {
         println!("Neither alphabetic nor numeric!");
     }
 
-    let your_character = '😊'; // 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/04_primitive_types/primitive_types3.rs

@@ -5,10 +5,10 @@
 // Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
-    let a = [0; 100];
+    let a = ???
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");

exercises/04_primitive_types/primitive_types4.rs

@@ -5,13 +5,13 @@
 // Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// 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/04_primitive_types/primitive_types5.rs

@@ -5,11 +5,11 @@
 // Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     let cat = ("Furry McFurson", 3.5);
-    let (name, age) = cat;
+    let /* your pattern here */ = cat;
 
     println!("{} is {} years old.", name, age);
 }

exercises/04_primitive_types/primitive_types6.rs

@@ -6,13 +6,13 @@
 // Execute `rustlings hint primitive_types6` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// 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/05_vecs/vecs1.rs

@@ -7,11 +7,11 @@
 //
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// 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
 
     (a, v)
 }

exercises/05_vecs/vecs2.rs

@@ -7,13 +7,13 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for element in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is
         // multiplied by 2.
-        *element *= 2;
+        ???
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].
@@ -24,7 +24,7 @@ fn vec_map(v: &Vec<i32>) -> Vec<i32> {
     v.iter().map(|element| {
         // TODO: Do the same thing as above - but instead of mutating the
         // Vec, you can just return the new number!
-        element * 2
+        ???
     }).collect()
 }
 

exercises/06_move_semantics/move_semantics1.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 fn main() {
@@ -15,7 +15,7 @@ fn main() {
 }
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let mut vec = vec;
+    let vec = vec;
 
     vec.push(88);
 

exercises/06_move_semantics/move_semantics2.rs

@@ -5,20 +5,20 @@
 // Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 fn main() {
     let vec0 = vec![22, 44, 66];
 
-    let mut vec1 = fill_vec(&vec0);
+    let mut vec1 = fill_vec(vec0);
 
     assert_eq!(vec0, vec![22, 44, 66]);
     assert_eq!(vec1, vec![22, 44, 66, 88]);
 }
 
-fn fill_vec(vec: &Vec<i32>) -> Vec<i32> {
-    let mut vec = vec.clone();
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+    let mut vec = vec;
 
     vec.push(88);
 

exercises/06_move_semantics/move_semantics3.rs

@@ -6,7 +6,7 @@
 // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 fn main() {
@@ -17,7 +17,7 @@ fn main() {
     assert_eq!(vec1, vec![22, 44, 66, 88]);
 }
 
-fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     vec.push(88);
 
     vec

exercises/06_move_semantics/move_semantics4.rs

@@ -7,20 +7,21 @@
 // Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 fn main() {
-    
-    let mut vec1 = fill_vec();
-    
+    let vec0 = vec![22, 44, 66];
+
+    let mut vec1 = fill_vec(vec0);
+
     assert_eq!(vec1, vec![22, 44, 66, 88]);
 }
 
 // `fill_vec()` no longer takes `vec: Vec<i32>` as argument - don't change this!
 fn fill_vec() -> Vec<i32> {
     // Instead, let's create and fill the Vec in here - how do you do that?
-    let mut vec = vec![22, 44, 66];
+    let mut vec = vec;
 
     vec.push(88);
 

exercises/06_move_semantics/move_semantics5.rs

@@ -6,14 +6,14 @@
 // Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 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/06_move_semantics/move_semantics6.rs

@@ -5,24 +5,24 @@
 // Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand
 // for a hint.
 
-// I AM  DONE
+// 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) {
-    data = data.to_uppercase();
+fn string_uppercase(mut data: &String) {
+    data = &data.to_uppercase();
 
     println!("{}", data);
 }

exercises/07_structs/structs1.rs

@@ -5,15 +5,13 @@
 // Execute `rustlings hint structs1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 struct ColorClassicStruct {
-    red: u8,
-    green: u8,
-    blue: u8,
+    // TODO: Something goes here
 }
 
-struct ColorTupleStruct(u8, u8, u8);
+struct ColorTupleStruct(/* TODO: Something goes here */);
 
 #[derive(Debug)]
 struct UnitLikeStruct;
@@ -25,11 +23,7 @@ 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);
@@ -39,7 +33,7 @@ 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);
@@ -49,7 +43,7 @@ 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/07_structs/structs2.rs

@@ -5,7 +5,7 @@
 // Execute `rustlings hint structs2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(Debug)]
 struct Order {
@@ -38,11 +38,7 @@ 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 {
-            name: String::from("Hacker in Rust"),
-            count: 1,
-            ..order_template
-        };
+        // let your_order =
         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/07_structs/structs3.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint structs3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(Debug)]
 struct Package {
@@ -31,12 +31,12 @@ impl Package {
         }
     }
 
-    fn is_international(&self) -> bool {
-        !self.sender_country.eq_ignore_ascii_case(&self.recipient_country)
+    fn is_international(&self) -> ??? {
+        // Something goes here...
     }
 
-    fn get_fees(&self, cents_per_gram: u32) -> u64 {
-        (cents_per_gram * self.weight_in_grams).into()
+    fn get_fees(&self, cents_per_gram: u32) -> ??? {
+        // Something goes here...
     }
 }
 

exercises/08_enums/enums1.rs

@@ -2,15 +2,11 @@
 //
 // No hints this time! ;)
 
-// I AM  DONE
+// 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/08_enums/enums2.rs

@@ -3,15 +3,11 @@
 // Execute `rustlings hint enums2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
     // TODO: define the different variants used below
-    Quit,
-    Echo(String),
-    Move { x: u32, y: u32 },
-    ChangeColor(u8, u8, u8),
 }
 
 impl Message {

exercises/08_enums/enums3.rs

@@ -5,14 +5,10 @@
 // Execute `rustlings hint enums3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 enum Message {
     // TODO: implement the message variant types based on their usage below
-    Quit,
-    Echo(String),
-    Move(Point),
-    ChangeColor(u8, u8, u8),
 }
 
 struct Point {
@@ -46,12 +42,6 @@ impl State {
 
     fn process(&mut self, message: Message) {
         // TODO: create a match expression to process the different message variants
-        match message {
-            Message::Quit => self.quit(),
-            Message::Echo(s) => self.echo(s),
-            Message::Move(p) => self.move_position(p),
-            Message::ChangeColor(red, green, blue) => self.change_color((red, green, blue)),
-        }
         // Remember: When passing a tuple as a function argument, you'll need extra parentheses:
         // fn function((t, u, p, l, e))
     }

exercises/09_strings/strings1.rs

@@ -5,7 +5,7 @@
 // Execute `rustlings hint strings1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     let answer = current_favorite_color();
@@ -13,5 +13,5 @@ fn main() {
 }
 
 fn current_favorite_color() -> String {
-    String::from("blue")
+    "blue"
 }

exercises/09_strings/strings2.rs

@@ -5,11 +5,11 @@
 // Execute `rustlings hint strings2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/09_strings/strings3.rs

@@ -3,22 +3,21 @@
 // Execute `rustlings hint strings3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn trim_me(input: &str) -> String {
     // TODO: Remove whitespace from both ends of a string!
-    input.trim().into()
+    ???
 }
 
 fn compose_me(input: &str) -> String {
     // TODO: Add " world!" to the string! There's multiple ways to do this!
-    format!("{input} world!")
-
+    ???
 }
 
 fn replace_me(input: &str) -> String {
     // TODO: Replace "cars" in the string with "balloons"!
-    input.replace("cars", "balloons")
+    ???
 }
 
 #[cfg(test)]

exercises/09_strings/strings4.rs

@@ -7,7 +7,7 @@
 //
 // No hints this time!
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn string_slice(arg: &str) {
     println!("{}", arg);
@@ -17,14 +17,14 @@ fn string(arg: String) {
 }
 
 fn main() {
-    string_slice("blue");
-    string("red".to_string());
-    string(String::from("hi"));
-    string("rust is fun!".to_owned());
-    string("nice weather".into());
-    string(format!("Interpolation {}", "Station"));
-    string_slice(&String::from("abc")[0..1]);
-    string_slice("  hello there ".trim());
-    string("Happy Monday!".to_string().replace("Mon", "Tues"));
-    string("mY sHiFt KeY iS sTiCkY".to_lowercase());
+    ???("blue");
+    ???("red".to_string());
+    ???(String::from("hi"));
+    ???("rust is fun!".to_owned());
+    ???("nice weather".into());
+    ???(format!("Interpolation {}", "Station"));
+    ???(&String::from("abc")[0..1]);
+    ???("  hello there ".trim());
+    ???("Happy Monday!".to_string().replace("Mon", "Tues"));
+    ???("mY sHiFt KeY iS sTiCkY".to_lowercase());
 }

exercises/10_modules/modules1.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint modules1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 mod sausage_factory {
     // Don't let anybody outside of this module see this!
@@ -11,7 +11,7 @@ mod sausage_factory {
         String::from("Ginger")
     }
 
-    pub fn make_sausage() {
+    fn make_sausage() {
         get_secret_recipe();
         println!("sausage!");
     }

exercises/10_modules/modules2.rs

@@ -7,12 +7,12 @@
 // Execute `rustlings hint modules2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 mod delicious_snacks {
     // TODO: Fix these use statements
-    pub use self::fruits::PEAR as fruit;
-    pub use self::veggies::CUCUMBER as veggie;
+    use self::fruits::PEAR as ???
+    use self::veggies::CUCUMBER as ???
 
     mod fruits {
         pub const PEAR: &'static str = "Pear";

exercises/10_modules/modules3.rs

@@ -8,10 +8,10 @@
 // Execute `rustlings hint modules3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/11_hashmaps/hashmaps1.rs

@@ -11,15 +11,15 @@
 // Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
-fn fruit_basket() -> HashMap<&'static str, u32> {
-    let mut basket = HashMap::from([("apple", 3), ("orange", 4)]);
+fn fruit_basket() -> HashMap<String, u32> {
+    let mut basket = // TODO: declare your hash map here.
 
     // Two bananas are already given for you :)
-    basket.insert("banana", 2);
+    basket.insert(String::from("banana"), 2);
 
     // TODO: Put more fruits in your basket here.
 

exercises/11_hashmaps/hashmaps2.rs

@@ -14,7 +14,7 @@
 // Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -40,7 +40,6 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // 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!
-        basket.entry(fruit).or_insert(2);
     }
 }
 

exercises/11_hashmaps/hashmaps3.rs

@@ -14,7 +14,7 @@
 // Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -39,13 +39,6 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
         // will be the number of goals conceded by team_2, and similarly
         // goals scored by team_2 will be the number of goals conceded by
         // team_1.
-        let team_1 = scores.entry(team_1_name).or_insert(Team { goals_scored: 0, goals_conceded: 0 });
-        team_1.goals_scored += team_1_score;
-        team_1.goals_conceded += team_2_score;
-        
-        let team_2 = scores.entry(team_2_name).or_insert(Team { goals_scored: 0, goals_conceded: 0 });
-        team_2.goals_scored += team_2_score;
-        team_2.goals_conceded += team_1_score;
     }
     scores
 }

exercises/12_options/options1.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint options1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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
@@ -13,12 +13,7 @@ fn maybe_icecream(time_of_day: u16) -> Option<u16> {
     // 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 {
-        Some(5)
-    }
-    else if time_of_day < 24 {
-        Some(0)
-    } else { None }
+    ???
 }
 
 #[cfg(test)]
@@ -38,7 +33,7 @@ mod tests {
     fn raw_value() {
         // TODO: Fix this test. How do you get at the value contained in the
         // Option?
-        let icecreams = maybe_icecream(12).unwrap_or_default();
+        let icecreams = maybe_icecream(12);
         assert_eq!(icecreams, 5);
     }
 }

exercises/12_options/options2.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint options2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
@@ -13,7 +13,7 @@ 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);
         }
     }
@@ -32,7 +32,7 @@ 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, cursor);
             cursor -= 1;
         }

exercises/12_options/options3.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint options3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 struct Point {
     x: i32,
@@ -14,7 +14,7 @@ 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),
         _ => panic!("no match!"),
     }
     y; // Fix without deleting this line.

exercises/13_error_handling/errors1.rs

@@ -9,14 +9,14 @@
 // Execute `rustlings hint errors1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-pub fn generate_nametag_text(name: String) -> Result<String, &'static str> {
+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.")
+        None
     } else {
-        Ok(format!("Hi! My name is {}", name))
+        Some(format!("Hi! My name is {}", name))
     }
 }
 

exercises/13_error_handling/errors2.rs

@@ -19,14 +19,14 @@
 // Execute `rustlings hint errors2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/13_error_handling/errors3.rs

@@ -7,11 +7,11 @@
 // Execute `rustlings hint errors3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-use std::{error::Error, num::ParseIntError};
+use std::num::ParseIntError;
 
-fn main() -> Result<(), Box<dyn Error>>{
+fn main() {
     let mut tokens = 100;
     let pretend_user_input = "8";
 
@@ -23,8 +23,6 @@ fn main() -> Result<(), Box<dyn Error>>{
         tokens -= cost;
         println!("You now have {} tokens.", tokens);
     }
-
-    Ok(())
 }
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {

exercises/13_error_handling/errors4.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint errors4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
@@ -17,11 +17,7 @@ enum CreationError {
 impl PositiveNonzeroInteger {
     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
         // Hmm... Why is this always returning an Ok value?
-        match value {
-            num if num < 0 => Err(CreationError::Negative),
-            0 => Err(CreationError::Zero),
-            _ => Ok(PositiveNonzeroInteger(value as u64)),
-        }
+        Ok(PositiveNonzeroInteger(value as u64))
     }
 }
 

exercises/13_error_handling/errors5.rs

@@ -22,15 +22,14 @@
 // Execute `rustlings hint errors5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::error;
-use std::error::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>> {
+fn main() -> Result<(), Box<dyn ???>> {
     let pretend_user_input = "42";
     let x: i64 = pretend_user_input.parse()?;
     println!("output={:?}", PositiveNonzeroInteger::new(x)?);

exercises/13_error_handling/errors6.rs

@@ -9,7 +9,7 @@
 // Execute `rustlings hint errors6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::num::ParseIntError;
 
@@ -25,15 +25,13 @@ impl ParsePosNonzeroError {
         ParsePosNonzeroError::Creation(err)
     }
     // TODO: add another error conversion function here.
-    fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
-        ParsePosNonzeroError::ParseInt(err)
-    }
+    // fn from_parseint...
 }
 
 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/14_generics/generics1.rs

@@ -6,9 +6,9 @@
 // Execute `rustlings hint generics1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// 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/14_generics/generics2.rs

@@ -6,14 +6,14 @@
 // Execute `rustlings hint generics2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-struct Wrapper<T> {
-    value: T,
+struct Wrapper {
+    value: u32,
 }
 
-impl<T> Wrapper<T> {
-    pub fn new(value: T) -> Self {
+impl Wrapper {
+    pub fn new(value: u32) -> Self {
         Wrapper { value }
     }
 }

exercises/15_traits/traits1.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint traits1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 trait AppendBar {
     fn append_bar(self) -> Self;
@@ -15,10 +15,6 @@ trait AppendBar {
 
 impl AppendBar for String {
     // TODO: Implement `AppendBar` for type `String`.
-    fn append_bar(mut self) -> Self {
-        self.push_str("Bar");
-        self
-    }
 }
 
 fn main() {

exercises/15_traits/traits2.rs

@@ -8,19 +8,13 @@
 //
 // Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// 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("Bar".to_string());
-        self
-    }
-}
 
 #[cfg(test)]
 mod tests {

exercises/15_traits/traits3.rs

@@ -8,12 +8,10 @@
 // Execute `rustlings hint traits3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub trait Licensed {
-    fn licensing_info(&self) -> String {
-        String::from("Some information")
-    }
+    fn licensing_info(&self) -> String;
 }
 
 struct SomeSoftware {

exercises/15_traits/traits4.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint traits4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub trait Licensed {
     fn licensing_info(&self) -> String {
@@ -23,7 +23,7 @@ impl Licensed for SomeSoftware {}
 impl Licensed for OtherSoftware {}
 
 // YOU MAY ONLY CHANGE THE NEXT LINE
-fn compare_license_types(software: impl Licensed, software_two: impl Licensed) -> bool {
+fn compare_license_types(software: ??, software_two: ??) -> bool {
     software.licensing_info() == software_two.licensing_info()
 }
 

exercises/15_traits/traits5.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint traits5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub trait SomeTrait {
     fn some_function(&self) -> bool {
@@ -30,7 +30,7 @@ impl SomeTrait for OtherStruct {}
 impl OtherTrait for OtherStruct {}
 
 // YOU MAY ONLY CHANGE THE NEXT LINE
-fn some_func(item: (impl SomeTrait + OtherTrait)) -> bool {
+fn some_func(item: ??) -> bool {
     item.some_function() && item.other_function()
 }
 

exercises/16_lifetimes/lifetimes1.rs

@@ -8,9 +8,9 @@
 // Execute `rustlings hint lifetimes1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+fn longest(x: &str, y: &str) -> &str {
     if x.len() > y.len() {
         x
     } else {

exercises/16_lifetimes/lifetimes2.rs

@@ -6,7 +6,7 @@
 // Execute `rustlings hint lifetimes2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
     if x.len() > y.len() {
@@ -19,8 +19,8 @@ fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
 fn main() {
     let string1 = String::from("long string is long");
     let result;
-    let string2 = String::from("xyz");
     {
+        let string2 = String::from("xyz");
         result = longest(string1.as_str(), string2.as_str());
     }
     println!("The longest string is '{}'", result);

exercises/16_lifetimes/lifetimes3.rs

@@ -5,11 +5,11 @@
 // Execute `rustlings hint lifetimes3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-struct Book<'a> {
-    author: &'a str,
-    title: &'a str,
+struct Book {
+    author: &str,
+    title: &str,
 }
 
 fn main() {

exercises/17_tests/tests1.rs

@@ -10,12 +10,12 @@
 // Execute `rustlings hint tests1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert() {
-        assert!(true);
+        assert!();
     }
 }

exercises/17_tests/tests2.rs

@@ -6,12 +6,12 @@
 // Execute `rustlings hint tests2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert_eq() {
-        assert_eq!(true, true);
+        assert_eq!();
     }
 }

exercises/17_tests/tests3.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint tests3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
@@ -19,11 +19,11 @@ mod tests {
 
     #[test]
     fn is_true_when_even() {
-        assert!(is_even(4));
+        assert!();
     }
 
     #[test]
     fn is_false_when_odd() {
-        assert!(!is_even(5));
+        assert!();
     }
 }

exercises/17_tests/tests4.rs

@@ -5,7 +5,7 @@
 // Execute `rustlings hint tests4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 struct Rectangle {
     width: i32,
@@ -30,20 +30,17 @@ mod tests {
     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!(rect.width, 10); // check width
-        assert_eq!(rect.height, 20); // check height
+        assert_eq!(???, 10); // check width
+        assert_eq!(???, 20); // check height
     }
 
     #[test]
-    #[should_panic]
     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]
-    #[should_panic]
-
     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);

exercises/18_iterators/iterators1.rs

@@ -9,18 +9,18 @@
 // Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[test]
 fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
-    let mut my_iterable_fav_fruits = my_fav_fruits.iter();   // TODO: Step 1
+    let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
 
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana"));
-    assert_eq!(my_iterable_fav_fruits.next(), Some(&"custard apple"));     // TODO: Step 2
+    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 2
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado"));
-    assert_eq!(my_iterable_fav_fruits.next(), Some(&"peach"));     // TODO: Step 3
+    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 3
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
-    assert_eq!(my_iterable_fav_fruits.next(), None);     // TODO: Step 4
+    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 4
 }

exercises/18_iterators/iterators2.rs

@@ -6,7 +6,7 @@
 // Execute `rustlings hint iterators2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 // Step 1.
 // Complete the `capitalize_first` function.
@@ -15,7 +15,7 @@ pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
         None => String::new(),
-        Some(first) => first.to_uppercase().to_string() + c.as_str(),
+        Some(first) => ???,
     }
 }
 
@@ -24,12 +24,7 @@ pub fn capitalize_first(input: &str) -> String {
 // Return a vector of strings.
 // ["hello", "world"] -> ["Hello", "World"]
 pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
-    let mut cap_words = vec![];
-    for word in words {
-        cap_words.push(capitalize_first(word));
-    }
-
-    cap_words
+    vec![]
 }
 
 // Step 3.
@@ -37,12 +32,7 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
 // Return a single string.
 // ["hello", " ", "world"] -> "Hello World"
 pub fn capitalize_words_string(words: &[&str]) -> String {
-    let mut cap_words = String::new();
-    for word in words {
-        cap_words.push_str(&capitalize_first(word));
-    }
-
-    cap_words
+    String::new()
 }
 
 #[cfg(test)]

exercises/18_iterators/iterators3.rs

@@ -9,7 +9,7 @@
 // Execute `rustlings hint iterators3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum DivisionError {
@@ -26,31 +26,23 @@ pub struct NotDivisibleError {
 // Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
 // Otherwise, return a suitable error.
 pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
-    if b == 0 {
-        Err(DivisionError::DivideByZero)
-    } else if a % b == 0 {
-        Ok(a / b)
-    } else {
-        Err(DivisionError::NotDivisible(NotDivisibleError { dividend: a, divisor: b }))
-    }
+    todo!();
 }
 
 // Complete the function and return a value of the correct type so the test
 // passes.
 // Desired output: Ok([1, 11, 1426, 3])
-fn result_with_list() -> Result<Vec<i32>, DivisionError> {
+fn result_with_list() -> () {
     let numbers = vec![27, 297, 38502, 81];
-    let division_results: Result<Vec<_>, DivisionError> = numbers.into_iter().map(|n| divide(n, 27)).collect();
-    division_results
+    let division_results = numbers.into_iter().map(|n| divide(n, 27));
 }
 
 // Complete the function and return a value of the correct type so the test
 // passes.
 // Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)]
-fn list_of_results() -> Vec<Result<i32, DivisionError>> {
+fn list_of_results() -> () {
     let numbers = vec![27, 297, 38502, 81];
-    let division_results: Vec<_> = numbers.into_iter().map(|n| divide(n, 27)).collect();
-    division_results
+    let division_results = numbers.into_iter().map(|n| divide(n, 27));
 }
 
 #[cfg(test)]

exercises/18_iterators/iterators4.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint iterators4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub fn factorial(num: u64) -> u64 {
     // Complete this function to return the factorial of num
@@ -15,7 +15,6 @@ pub fn factorial(num: u64) -> u64 {
     // For an extra challenge, don't use:
     // - recursion
     // Execute `rustlings hint iterators4` for hints.
-    (2..=num).product()
 }
 
 #[cfg(test)]

exercises/18_iterators/iterators5.rs

@@ -11,7 +11,7 @@
 // Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -35,7 +35,7 @@ fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
 fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
     // map is a hashmap with String keys and Progress values.
     // map = { "variables1": Complete, "from_str": None, ... }
-    map.iter().filter(|(_, val)| *val == &value).count()
+    todo!();
 }
 
 fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
@@ -54,7 +54,7 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
     // collection is a slice of hashmaps.
     // collection = [{ "variables1": Complete, "from_str": None, ... },
     //     { "variables2": Complete, ... }, ... ]
-    collection.iter().map(|map| count_iterator(map, value)).sum()
+    todo!();
 }
 
 #[cfg(test)]

exercises/19_smart_pointers/arc1.rs

@@ -21,7 +21,7 @@
 //
 // Execute `rustlings hint arc1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #![forbid(unused_imports)] // Do not change this, (or the next) line.
 use std::sync::Arc;
@@ -29,11 +29,11 @@ use std::thread;
 
 fn main() {
     let numbers: Vec<_> = (0..100u32).collect();
-    let shared_numbers = Arc::new(numbers);// TODO
+    let shared_numbers = // TODO
     let mut joinhandles = Vec::new();
 
     for offset in 0..8 {
-        let child_numbers = Arc::clone(&shared_numbers);// TODO
+        let child_numbers = // TODO
         joinhandles.push(thread::spawn(move || {
             let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
             println!("Sum of offset {} is {}", offset, sum);

exercises/19_smart_pointers/box1.rs

@@ -18,11 +18,11 @@
 //
 // Execute `rustlings hint box1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[derive(PartialEq, Debug)]
 pub enum List {
-    Cons(i32, Box<List>),
+    Cons(i32, List),
     Nil,
 }
 
@@ -35,11 +35,11 @@ fn main() {
 }
 
 pub fn create_empty_list() -> List {
-    List::Nil
+    todo!()
 }
 
 pub fn create_non_empty_list() -> List {
-    List::Cons(0, Box::new(List::Nil))
+    todo!()
 }
 
 #[cfg(test)]

exercises/19_smart_pointers/cow1.rs

@@ -12,7 +12,7 @@
 //
 // Execute `rustlings hint cow1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::borrow::Cow;
 
@@ -48,8 +48,7 @@ mod tests {
         let slice = [0, 1, 2];
         let mut input = Cow::from(&slice[..]);
         match abs_all(&mut input) {
-            Cow::Borrowed(_) => Ok(()),
-            _ => Err("Expected borrowed value"),
+            // TODO
         }
     }
 
@@ -61,8 +60,7 @@ mod tests {
         let slice = vec![0, 1, 2];
         let mut input = Cow::from(slice);
         match abs_all(&mut input) {
-            Cow::Owned(_) => Ok(()),
-            _ => Err("Expected owned value"),
+            // TODO
         }
     }
 
@@ -74,8 +72,7 @@ mod tests {
         let slice = vec![-1, 0, 1];
         let mut input = Cow::from(slice);
         match abs_all(&mut input) {
-            Cow::Owned(_) => Ok(()),
-            _ => Err("Expected owned value"),
+            // TODO
         }
     }
 }

exercises/19_smart_pointers/rc1.rs

@@ -10,7 +10,7 @@
 //
 // Execute `rustlings hint rc1` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::rc::Rc;
 
@@ -61,17 +61,17 @@ fn main() {
     jupiter.details();
 
     // TODO
-    let saturn = Planet::Saturn(Rc::clone(&sun));
+    let saturn = Planet::Saturn(Rc::new(Sun {}));
     println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
     saturn.details();
 
     // TODO
-    let uranus = Planet::Uranus(Rc::clone(&sun));
+    let uranus = Planet::Uranus(Rc::new(Sun {}));
     println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
     uranus.details();
 
     // TODO
-    let neptune = Planet::Neptune(Rc::clone(&sun));
+    let neptune = Planet::Neptune(Rc::new(Sun {}));
     println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
     neptune.details();
 
@@ -93,15 +93,12 @@ fn main() {
     println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
 
     // TODO
-    drop(earth);
     println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
 
     // TODO
-    drop(venus);
     println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
 
     // TODO
-    drop(mercury);
     println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
 
     assert_eq!(Rc::strong_count(&sun), 1);

exercises/20_threads/threads1.rs

@@ -8,7 +8,7 @@
 // Execute `rustlings hint threads1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::thread;
 use std::time::{Duration, Instant};
@@ -27,7 +27,6 @@ fn main() {
     let mut results: Vec<u128> = vec![];
     for handle in handles {
         // TODO: a struct is returned from thread::spawn, can you use it?
-        results.push(handle.join().unwrap());
     }
 
     if results.len() != 10 {

exercises/20_threads/threads2.rs

@@ -7,9 +7,9 @@
 // Execute `rustlings hint threads2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use std::thread;
 use std::time::Duration;
 
@@ -18,14 +18,14 @@ struct JobStatus {
 }
 
 fn main() {
-    let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 0 }));
+    let status = Arc::new(JobStatus { jobs_completed: 0 });
     let mut handles = vec![];
     for _ in 0..10 {
         let status_shared = Arc::clone(&status);
         let handle = thread::spawn(move || {
             thread::sleep(Duration::from_millis(250));
             // TODO: You must take an action before you update a shared value
-            status_shared.lock().unwrap().jobs_completed += 1;
+            status_shared.jobs_completed += 1;
         });
         handles.push(handle);
     }
@@ -34,6 +34,6 @@ fn main() {
         // TODO: Print the value of the JobStatus.jobs_completed. Did you notice
         // anything interesting in the output? Do you have to 'join' on all the
         // handles?
-        println!("jobs completed {}", status.lock().unwrap().jobs_completed);
+        println!("jobs completed {}", ???);
     }
 }

exercises/20_threads/threads3.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint threads3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::sync::mpsc;
 use std::sync::Arc;
@@ -31,11 +31,10 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
     let qc1 = Arc::clone(&qc);
     let qc2 = Arc::clone(&qc);
 
-    let tx1 = tx.clone();
     thread::spawn(move || {
         for val in &qc1.first_half {
             println!("sending {:?}", val);
-            tx1.send(*val).unwrap();
+            tx.send(*val).unwrap();
             thread::sleep(Duration::from_secs(1));
         }
     });

exercises/21_macros/macros1.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint macros1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 macro_rules! my_macro {
     () => {
@@ -12,5 +12,5 @@ macro_rules! my_macro {
 }
 
 fn main() {
-    my_macro!();
+    my_macro();
 }

exercises/21_macros/macros2.rs

@@ -3,15 +3,14 @@
 // Execute `rustlings hint macros2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
+
+fn main() {
+    my_macro!();
+}
 
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
     };
 }
-
-fn main() {
-    my_macro!();
-}
-

exercises/21_macros/macros3.rs

@@ -5,10 +5,9 @@
 // Execute `rustlings hint macros3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 mod macros {
-    #[macro_export]
     macro_rules! my_macro {
         () => {
             println!("Check out my macro!");

exercises/21_macros/macros4.rs

@@ -3,13 +3,13 @@
 // Execute `rustlings hint macros4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[rustfmt::skip]
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
-    };
+    }
     ($val:expr) => {
         println!("Look at this other macro: {}", $val);
     }

exercises/22_clippy/Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "clippy3"
-version = "0.0.1"

exercises/22_clippy/Cargo.toml

@@ -1,7 +0,0 @@
-[package]
-name = "clippy3"
-version = "0.0.1"
-edition = "2021"
-[[bin]]
-name = "clippy3"
-path = "clippy3.rs"

exercises/22_clippy/clippy1.rs

@@ -9,12 +9,12 @@
 // Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 use std::f32;
 
 fn main() {
-    let pi = f32::consts::PI;
+    let pi = 3.14f32;
     let radius = 5.00f32;
 
     let area = pi * f32::powi(radius, 2);

exercises/22_clippy/clippy2.rs

@@ -3,12 +3,12 @@
 // Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn main() {
     let mut res = 42;
     let option = Some(12);
-    if let Some(x) = option {
+    for x in option {
         res += x;
     }
     println!("{}", res);

exercises/22_clippy/clippy3.rs

@@ -3,29 +3,28 @@
 // Here's a couple more easy Clippy fixes, so you can see its utility.
 // No hints.
 
-// I AM  DONE
+// I AM NOT DONE
 
 #[allow(unused_variables, unused_assignments)]
 fn main() {
     let my_option: Option<()> = None;
     if my_option.is_none() {
-        // my_option.unwrap();
+        my_option.unwrap();
     }
 
     let my_arr = &[
-        -1, -2, -3,
+        -1, -2, -3
         -4, -5, -6
     ];
     println!("My array! Here it is: {:?}", my_arr);
 
-    let mut my_empty_vec = vec![1, 2, 3, 4, 5];
-    my_empty_vec.clear();
+    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
     println!("This Vec is empty, see? {:?}", my_empty_vec);
 
     let mut value_a = 45;
     let mut value_b = 66;
     // Let's swap these two!
-    std::mem::swap(&mut value_a, &mut value_b);
-   
+    value_a = value_b;
+    value_b = value_a;
     println!("value a: {}; value b: {}", value_a, value_b);
 }

exercises/23_conversions/as_ref_mut.rs

@@ -7,25 +7,25 @@
 // Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 // Obtain the number of bytes (not characters) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
+fn byte_counter<T>(arg: T) -> usize {
     arg.as_ref().as_bytes().len()
 }
 
 // Obtain the number of characters (not bytes) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn char_counter<T: AsRef<str>>(arg: T) -> usize {
+fn char_counter<T>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 
 // Squares a number using as_mut().
 // TODO: Add the appropriate trait bound.
-fn num_sq<T: AsMut<u32>>(arg: &mut T) {
+fn num_sq<T>(arg: &mut T) {
     // TODO: Implement the function body.
-    *arg.as_mut() *= *arg.as_mut()
+    ???
 }
 
 #[cfg(test)]

exercises/23_conversions/from_into.rs

@@ -40,31 +40,10 @@ impl Default for Person {
 // If while parsing the age, something goes wrong, then return the default of
 // Person Otherwise, then return an instantiated Person object with the results
 
-// I AM  DONE
+// I AM NOT DONE
 
 impl From<&str> for Person {
     fn from(s: &str) -> Person {
-        let mut split = s.split(',');
-
-        let name;
-        match split.next() {
-            Some(n) if !n.is_empty() => name = n,
-            _ => return Person::default()
-        }
-       
-        let mut age ;
-        match split.next() {
-            Some(a) => match a.parse::<usize>() {
-                Ok(ag) => age = ag,
-                Err(_) => return Person::default(),
-            },
-            None => return Person::default(),
-        }
-
-        Person {
-            name: name.into(),
-            age
-        }
     }
 }
 

exercises/23_conversions/from_str.rs

@@ -31,7 +31,7 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM  DONE
+// I AM NOT DONE
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -52,26 +52,6 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
-        if s.is_empty() { return Err(ParsePersonError::Empty) }
-
-        let mut split = s.split(',');
-        if split.clone().count() != 2 { return Err(ParsePersonError::BadLen) }
-
-        let name=split.next().unwrap();
-        if name.is_empty() {
-            return Err(ParsePersonError::NoName)
-        };
-        
-        let mut age ;
-        match split.next().unwrap().parse::<usize>() {
-            Ok(a) => age = a,
-            Err(e) => return Err(ParsePersonError::ParseInt(e)),
-        };
-
-        Ok(Person {
-            name: name.into(),
-            age
-        })
     }
 }
 

exercises/23_conversions/try_from_into.rs

@@ -27,7 +27,7 @@ enum IntoColorError {
     IntConversion,
 }
 
-// I AM  DONE
+// I AM NOT DONE
 
 // Your task is to complete this implementation and return an Ok result of inner
 // type Color. You need to create an implementation for a tuple of three
@@ -41,11 +41,6 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
-        Ok(Color {
-            red: u8::try_from(tuple.0).or(Err(IntoColorError::IntConversion))?,
-            green: u8::try_from(tuple.1).or(Err(IntoColorError::IntConversion))?,
-            blue: u8::try_from(tuple.2).or(Err(IntoColorError::IntConversion))?,
-        })
     }
 }
 
@@ -53,7 +48,6 @@ impl TryFrom<(i16, i16, i16)> for Color {
 impl TryFrom<[i16; 3]> for Color {
     type Error = IntoColorError;
     fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
-        Self::try_from((arr[0], arr[1], arr[2]))
     }
 }
 
@@ -61,8 +55,6 @@ impl TryFrom<[i16; 3]> for Color {
 impl TryFrom<&[i16]> for Color {
     type Error = IntoColorError;
     fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
-        if slice.len() != 3 { return Err(IntoColorError::BadLen); }
-        Self::try_from((slice[0], slice[1], slice[2]))
     }
 }
 

exercises/23_conversions/using_as.rs

@@ -10,11 +10,11 @@
 // Execute `rustlings hint using_as` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().sum::<f64>();
-    total / values.len() as f64
+    total / values.len()
 }
 
 fn main() {

exercises/quiz1.rs

@@ -13,11 +13,10 @@
 //
 // No hints this time ;)
 
-// I AM  DONE
+// I AM NOT DONE
 
-fn calculate_price_of_apples(qty: u16) -> u32 {
-    if qty > 40 { qty.into() } else { (qty * 2).into() }
-}
+// Put your function here!
+// fn calculate_price_of_apples {
 
 // Don't modify this function!
 #[test]

exercises/quiz2.rs

@@ -20,7 +20,7 @@
 //
 // No hints this time!
 
-// I AM  DONE
+// I AM NOT DONE
 
 pub enum Command {
     Uppercase,
@@ -32,22 +32,11 @@ 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![];
+        let mut output: ??? = vec![];
         for (string, command) in input.iter() {
             // TODO: Complete the function body. You can do it!
-            output.push(match command {
-                Command::Uppercase =>string.to_uppercase(),
-                Command::Trim =>string.trim().into(),
-                Command::Append(num) => {
-                    let mut string = String::from(string);
-                    for i in 0..*num {
-                        string.push_str("bar");
-                    };
-                    string
-                },
-            })
         }
         output
     }
@@ -56,7 +45,7 @@ mod my_module {
 #[cfg(test)]
 mod tests {
     // TODO: What do we need to import to have `transformer` in scope?
-    use super::my_module::transformer;
+    use ???;
     use super::Command;
 
     #[test]

exercises/quiz3.rs

@@ -16,17 +16,15 @@
 //
 // Execute `rustlings hint quiz3` or use the `hint` watch subcommand for a hint.
 
-// I AM  DONE
+// I AM NOT DONE
 
-use std::fmt::Display;
-
-pub struct ReportCard<T: Display> {
-    pub grade: T,
+pub struct ReportCard {
+    pub grade: f32,
     pub student_name: String,
     pub student_age: u8,
 }
 
-impl<T: Display> ReportCard<T> {
+impl ReportCard {
     pub fn print(&self) -> String {
         format!("{} ({}) - achieved a grade of {}",
             &self.student_name, &self.student_age, &self.grade)
@@ -54,7 +52,7 @@ mod tests {
     fn generate_alphabetic_report_card() {
         // TODO: Make sure to change the grade here after you finish the exercise.
         let report_card = ReportCard {
-            grade: "A+",
+            grade: 2.1,
             student_name: "Gary Plotter".to_string(),
             student_age: 11,
         };

rustlings

@@ -1 +0,0 @@
-Subproject commit 9a743f80c57cc6bf27819589a8ddb5a5579ab1a4