Merge branch 'master' into refactor-hints

51 files changed, 107 insertions, 0 deletions

diff --git a/exercises/enums/enums1.rs b/exercises/enums/enums1.rs
index ee665db..a2223d3 100644
--- a/exercises/enums/enums1.rs
+++ b/exercises/enums/enums1.rs
@@ -1,6 +1,8 @@
 // enums1.rs
 // Make me compile! Execute `rustlings hint enums1` for hints!
 
+// I AM NOT DONE
+
 #[derive(Debug)]
 enum Message {
     // TODO: define a few types of messages as used below
diff --git a/exercises/enums/enums2.rs b/exercises/enums/enums2.rs
index f9eb8bd..52ccb22 100644
--- a/exercises/enums/enums2.rs
+++ b/exercises/enums/enums2.rs
@@ -1,6 +1,8 @@
 // enums2.rs
 // Make me compile! Execute `rustlings hint enums2` for hints!
 
+// I AM NOT DONE
+
 #[derive(Debug)]
 enum Message {
     // TODO: define the different variants used below
diff --git a/exercises/enums/enums3.rs b/exercises/enums/enums3.rs
index c5d81bf..bb7dfb4 100644
--- a/exercises/enums/enums3.rs
+++ b/exercises/enums/enums3.rs
@@ -1,6 +1,8 @@
 // enums3.rs
 // Address all the TODOs to make the tests pass!
 
+// I AM NOT DONE
+
 enum Message {
     // TODO: implement the message variant types based on their usage below
 }
diff --git a/exercises/error_handling/errors1.rs b/exercises/error_handling/errors1.rs
index f585e29..9c24d85 100644
--- a/exercises/error_handling/errors1.rs
+++ b/exercises/error_handling/errors1.rs
@@ -6,6 +6,8 @@
 // this function to have.
 // Execute `rustlings hint errors1` for hints!
 
+// I AM NOT DONE
+
 pub fn generate_nametag_text(name: String) -> Option<String> {
     if name.len() > 0 {
         Some(format!("Hi! My name is {}", name))
diff --git a/exercises/error_handling/errors2.rs b/exercises/error_handling/errors2.rs
index 5ac6339..aad3a93 100644
--- a/exercises/error_handling/errors2.rs
+++ b/exercises/error_handling/errors2.rs
@@ -16,6 +16,8 @@
 // There are at least two ways to implement this that are both correct-- but
 // one is a lot shorter! Execute `rustlings hint errors2` for hints to both ways.
 
+// I AM NOT DONE
+
 use std::num::ParseIntError;
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
diff --git a/exercises/error_handling/errors3.rs b/exercises/error_handling/errors3.rs
index d9ec133..460ac5c 100644
--- a/exercises/error_handling/errors3.rs
+++ b/exercises/error_handling/errors3.rs
@@ -4,6 +4,8 @@
 // Why not? What should we do to fix it?
 // Execute `rustlings hint errors3` for hints!
 
+// I AM NOT DONE
+
 use std::num::ParseIntError;
 
 fn main() {
diff --git a/exercises/error_handling/errorsn.rs b/exercises/error_handling/errorsn.rs
index 2f3566b..fc25308 100644
--- a/exercises/error_handling/errorsn.rs
+++ b/exercises/error_handling/errorsn.rs
@@ -15,6 +15,8 @@
 //
 // Execute `rustlings hint errors4` for hints :)
 
+// I AM NOT DONE
+
 use std::error;
 use std::fmt;
 use std::io;
diff --git a/exercises/error_handling/option1.rs b/exercises/error_handling/option1.rs
index e334e93..5d81b15 100644
--- a/exercises/error_handling/option1.rs
+++ b/exercises/error_handling/option1.rs
@@ -4,6 +4,8 @@
 // on `None`. Handle this in a more graceful way than calling `unwrap`!
 // Execute `rustlings hint option1` for hints :)
 
+// I AM NOT DONE
+
 pub fn pop_too_much() -> bool {
     let mut list = vec![3];
 
diff --git a/exercises/error_handling/result1.rs b/exercises/error_handling/result1.rs
index c3f2d6e..352a6c2 100644
--- a/exercises/error_handling/result1.rs
+++ b/exercises/error_handling/result1.rs
@@ -1,6 +1,8 @@
 // result1.rs
 // Make this test pass! Execute `rustlings hint option2` for hints :)
 
+// I AM NOT DONE
+
 #[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
 
diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs
index 313fe1e..49d48e9 100644
--- a/exercises/functions/functions1.rs
+++ b/exercises/functions/functions1.rs
@@ -1,6 +1,8 @@
 // functions1.rs
 // Make me compile! Execute `rustlings hint function1` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     call_me();
 }
diff --git a/exercises/functions/functions2.rs b/exercises/functions/functions2.rs
index 9bb3d76..108ba38 100644
--- a/exercises/functions/functions2.rs
+++ b/exercises/functions/functions2.rs
@@ -1,6 +1,8 @@
 // functions2.rs
 // Make me compile! Execute `rustlings hint functions2` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     call_me(3);
 }
diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs
index b2e90f6..e3c1bf7 100644
--- a/exercises/functions/functions3.rs
+++ b/exercises/functions/functions3.rs
@@ -1,6 +1,8 @@
 // functions3.rs
 // Make me compile! Execute `rustlings hint functions3` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     call_me();
 }
diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs
index 78fc27b..6bf46f0 100644
--- a/exercises/functions/functions4.rs
+++ b/exercises/functions/functions4.rs
@@ -4,6 +4,8 @@
 // This store is having a sale where if the price is an even number, you get
 // 10 (money unit) off, but if it's an odd number, it's 3 (money unit) less.
 
+// I AM NOT DONE
+
 fn main() {
     let original_price = 51;
     println!("Your sale price is {}", sale_price(original_price));
diff --git a/exercises/functions/functions5.rs b/exercises/functions/functions5.rs
index c7841a6..d22aa6c 100644
--- a/exercises/functions/functions5.rs
+++ b/exercises/functions/functions5.rs
@@ -1,6 +1,8 @@
 // functions5.rs
 // Make me compile! Execute `rustlings hint functions5` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     let answer = square(3);
     println!("The answer is {}", answer);
diff --git a/exercises/if/if1.rs b/exercises/if/if1.rs
index bce052a..9086754 100644
--- a/exercises/if/if1.rs
+++ b/exercises/if/if1.rs
@@ -1,5 +1,7 @@
 // if1.rs
 
+// I AM NOT DONE
+
 pub fn bigger(a: i32, b: i32) -> i32 {
     // Complete this function to return the bigger number!
     // Do not use:
diff --git a/exercises/macros/macros1.rs b/exercises/macros/macros1.rs
index 0bc2a69..ed0dac8 100644
--- a/exercises/macros/macros1.rs
+++ b/exercises/macros/macros1.rs
@@ -1,6 +1,8 @@
 // macros1.rs
 // Make me compile! Execute `rustlings hint macros1` for hints :)
 
+// I AM NOT DONE
+
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
diff --git a/exercises/macros/macros2.rs b/exercises/macros/macros2.rs
index c4b4510..d0be123 100644
--- a/exercises/macros/macros2.rs
+++ b/exercises/macros/macros2.rs
@@ -1,6 +1,8 @@
 // macros2.rs
 // Make me compile! Execute `rustlings hint macros2` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     my_macro!();
 }
diff --git a/exercises/macros/macros3.rs b/exercises/macros/macros3.rs
index 9b08adc..93a4311 100644
--- a/exercises/macros/macros3.rs
+++ b/exercises/macros/macros3.rs
@@ -2,6 +2,8 @@
 // Make me compile, without taking the macro out of the module!
 // Execute `rustlings hint macros3` for hints :)
 
+// I AM NOT DONE
+
 mod macros {
     macro_rules! my_macro {
         () => {
diff --git a/exercises/macros/macros4.rs b/exercises/macros/macros4.rs
index 2ecba7d..3a74807 100644
--- a/exercises/macros/macros4.rs
+++ b/exercises/macros/macros4.rs
@@ -1,6 +1,8 @@
 // macros4.rs
 // Make me compile! Execute `rustlings hint macros4` for hints :)
 
+// I AM NOT DONE
+
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
diff --git a/exercises/modules/modules1.rs b/exercises/modules/modules1.rs
index c50d62f..812dfee 100644
--- a/exercises/modules/modules1.rs
+++ b/exercises/modules/modules1.rs
@@ -1,6 +1,8 @@
 // modules1.rs
 // Make me compile! Execute `rustlings hint modules1` for hints :)
 
+// I AM NOT DONE
+
 mod sausage_factory {
     fn make_sausage() {
         println!("sausage!");
diff --git a/exercises/modules/modules2.rs b/exercises/modules/modules2.rs
index c3bf4f7..fde439d 100644
--- a/exercises/modules/modules2.rs
+++ b/exercises/modules/modules2.rs
@@ -1,6 +1,8 @@
 // modules2.rs
 // Make me compile! Execute `rustlings hint modules2` for hints :)
 
+// I AM NOT DONE
+
 mod delicious_snacks {
     use self::fruits::PEAR as fruit;
     use self::veggies::CUCUMBER as veggie;
diff --git a/exercises/move_semantics/move_semantics1.rs b/exercises/move_semantics/move_semantics1.rs
index a69ec60..e2f5876 100644
--- a/exercises/move_semantics/move_semantics1.rs
+++ b/exercises/move_semantics/move_semantics1.rs
@@ -1,6 +1,8 @@
 // move_semantics1.rs
 // Make me compile! Execute `rustlings hint move_semantics1` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
diff --git a/exercises/move_semantics/move_semantics2.rs b/exercises/move_semantics/move_semantics2.rs
index b945042..9233bb7 100644
--- a/exercises/move_semantics/move_semantics2.rs
+++ b/exercises/move_semantics/move_semantics2.rs
@@ -2,6 +2,8 @@
 // Make me compile without changing line 10!
 // Execute `rustlings hint move_semantics2` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs
index 3f7958f..43fef74 100644
--- a/exercises/move_semantics/move_semantics3.rs
+++ b/exercises/move_semantics/move_semantics3.rs
@@ -3,6 +3,8 @@
 // (no lines with multiple semicolons necessary!)
 // Execute `rustlings hint move_semantics3` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
diff --git a/exercises/move_semantics/move_semantics4.rs b/exercises/move_semantics/move_semantics4.rs
index 2143b81..a1c4a41 100644
--- a/exercises/move_semantics/move_semantics4.rs
+++ b/exercises/move_semantics/move_semantics4.rs
@@ -4,6 +4,8 @@
 // freshly created vector from fill_vec to its caller.
 // Execute `rustlings hint move_semantics4` for hints!
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs
index c3d11fe..0912139 100644
--- a/exercises/primitive_types/primitive_types1.rs
+++ b/exercises/primitive_types/primitive_types1.rs
@@ -2,6 +2,8 @@
 // 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`)
 
diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs
index f5c8f87..6576a4d 100644
--- a/exercises/primitive_types/primitive_types2.rs
+++ b/exercises/primitive_types/primitive_types2.rs
@@ -2,6 +2,8 @@
 // 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`)
 
diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs
index e58c76c..dfd6351 100644
--- a/exercises/primitive_types/primitive_types3.rs
+++ b/exercises/primitive_types/primitive_types3.rs
@@ -2,6 +2,8 @@
 // Create an array with at least 100 elements in it where the ??? is. 
 // Execute `rustlings hint primitive_types3` for hints!
 
+// I AM NOT DONE
+
 fn main() {
     let a = ???
 
diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs
index 2efa58a..ff1e279 100644
--- a/exercises/primitive_types/primitive_types4.rs
+++ b/exercises/primitive_types/primitive_types4.rs
@@ -2,6 +2,8 @@
 // Get a slice out of Array a where the ??? is so that the `if` statement
 // returns true. Execute `rustlings hint primitive_types4` for hints!!
 
+// I AM NOT DONE
+
 #[test]
 fn main() {
     let a = [1, 2, 3, 4, 5];
diff --git a/exercises/primitive_types/primitive_types5.rs b/exercises/primitive_types/primitive_types5.rs
index 6ab1c21..680d8d2 100644
--- a/exercises/primitive_types/primitive_types5.rs
+++ b/exercises/primitive_types/primitive_types5.rs
@@ -2,6 +2,8 @@
 // Destructure the `cat` tuple so that the println will work.
 // Execute `rustlings hint primitive_types5` for hints!
 
+// I AM NOT DONE
+
 fn main() {
     let cat = ("Furry McFurson", 3.5);
     let /* your pattern here */ = cat;
diff --git a/exercises/primitive_types/primitive_types6.rs b/exercises/primitive_types/primitive_types6.rs
index 219a53e..2bc817e 100644
--- a/exercises/primitive_types/primitive_types6.rs
+++ b/exercises/primitive_types/primitive_types6.rs
@@ -3,6 +3,8 @@
 // You can put this right into the `println!` where the ??? is.
 // Execute `rustlings hint primitive_types6` for hints!
 
+// I AM NOT DONE
+
 fn main() {
     let numbers = (1, 2, 3);
     println!("The second number is {}", ???);
diff --git a/exercises/standard_library_types/arc1.rs b/exercises/standard_library_types/arc1.rs
index 5aa02d9..04c169f 100644
--- a/exercises/standard_library_types/arc1.rs
+++ b/exercises/standard_library_types/arc1.rs
@@ -4,6 +4,8 @@
 // somewhere. Try not to create any copies of the `numbers` Vec!
 // Execute `rustlings help arc1` for hints :)
 
+// I AM NOT DONE
+
 use std::sync::Arc;
 use std::thread;
 
diff --git a/exercises/standard_library_types/iterators2.rs b/exercises/standard_library_types/iterators2.rs
index e70d5b6..a1274a2 100644
--- a/exercises/standard_library_types/iterators2.rs
+++ b/exercises/standard_library_types/iterators2.rs
@@ -5,6 +5,8 @@
 // Step 3. Apply the `capitalize_first` function again to a list, but try and ensure it returns a single string
 // As always, there are hints if you execute `rustlings hint iterators2`!
 
+// I AM NOT DONE
+
 pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
diff --git a/exercises/standard_library_types/iterators3.rs b/exercises/standard_library_types/iterators3.rs
index d5a5afa..353cea6 100644
--- a/exercises/standard_library_types/iterators3.rs
+++ b/exercises/standard_library_types/iterators3.rs
@@ -7,6 +7,8 @@
 // Execute `rustlings hint iterators3` to get some hints!
 // Have fun :-)
 
+// I AM NOT DONE
+
 #[derive(Debug, PartialEq, Eq)]
 pub enum DivisionError {
     NotDivisible(NotDivisibleError),
diff --git a/exercises/standard_library_types/iterators4.rs b/exercises/standard_library_types/iterators4.rs
index bcb7f3c..b945613 100644
--- a/exercises/standard_library_types/iterators4.rs
+++ b/exercises/standard_library_types/iterators4.rs
@@ -1,5 +1,7 @@
 // iterators4.rs
 
+// I AM NOT DONE
+
 pub fn factorial(num: u64) -> u64 {
     // Complete this function to return factorial of num
     // Do not use:
diff --git a/exercises/strings/strings1.rs b/exercises/strings/strings1.rs
index 0faf86e..8090244 100644
--- a/exercises/strings/strings1.rs
+++ b/exercises/strings/strings1.rs
@@ -2,6 +2,8 @@
 // Make me compile without changing the function signature!
 // Execute `rustlings hint strings1` for hints ;)
 
+// I AM NOT DONE
+
 fn main() {
     let answer = current_favorite_color();
     println!("My current favorite color is {}", answer);
diff --git a/exercises/strings/strings2.rs b/exercises/strings/strings2.rs
index bd0f35c..5a2ce74 100644
--- a/exercises/strings/strings2.rs
+++ b/exercises/strings/strings2.rs
@@ -2,6 +2,8 @@
 // Make me compile without changing the function signature!
 // Execute `rustlings hint strings2` for hints :)
 
+// I AM NOT DONE
+
 fn main() {
     let word = String::from("green"); // Try not changing this line :)
     if is_a_color_word(word) {
diff --git a/exercises/structs/structs1.rs b/exercises/structs/structs1.rs
index 138b3fd..6d0b2f4 100644
--- a/exercises/structs/structs1.rs
+++ b/exercises/structs/structs1.rs
@@ -1,6 +1,8 @@
 // structs1.rs
 // Address all the TODOs to make the tests pass!
 
+// I AM NOT DONE
+
 struct ColorClassicStruct {
     // TODO: Something goes here
 }
diff --git a/exercises/structs/structs2.rs b/exercises/structs/structs2.rs
index db381e7..0699137 100644
--- a/exercises/structs/structs2.rs
+++ b/exercises/structs/structs2.rs
@@ -2,6 +2,8 @@
 // Address all the TODOs to make the tests pass!
 // No hints, just do it!
 
+// I AM NOT DONE
+
 #[derive(Debug)]
 struct Order {
     name: String,
diff --git a/exercises/test1.rs b/exercises/test1.rs
index 6c27355..3e13ce5 100644
--- a/exercises/test1.rs
+++ b/exercises/test1.rs
@@ -7,6 +7,8 @@
 // more than 40 at once, each apple only costs 1! Write a function that calculates
 // the price of an order of apples given the order amount. No hints this time!
 
+// I AM NOT DONE
+
 // Put your function here!
 // fn ..... {
 
diff --git a/exercises/test2.rs b/exercises/test2.rs
index 7fe81c6..d01606c 100644
--- a/exercises/test2.rs
+++ b/exercises/test2.rs
@@ -7,6 +7,8 @@
 // you think each value is. That is, add either `string_slice` or `string`
 // before the parentheses on each line. If you're right, it will compile!
 
+// I AM NOT DONE
+
 fn string_slice(arg: &str) {
     println!("{}", arg);
 }
diff --git a/exercises/test3.rs b/exercises/test3.rs
index 9a72118..f94c36f 100644
--- a/exercises/test3.rs
+++ b/exercises/test3.rs
@@ -7,6 +7,8 @@
 // we expect to get when we call `times_two` with a negative number.
 // No hints, you can do this :)
 
+// I AM NOT DONE
+
 pub fn times_two(num: i32) -> i32 {
     num * 2
 }
diff --git a/exercises/test4.rs b/exercises/test4.rs
index e50f1b0..c543a64 100644
--- a/exercises/test4.rs
+++ b/exercises/test4.rs
@@ -5,6 +5,8 @@
 
 // Write a macro that passes the test! No hints this time, you can do it!
 
+// I AM NOT DONE
+
 fn main() {
     if my_macro!("world!") != "Hello world!" {
         panic!("Oh no! Wrong output!");
diff --git a/exercises/tests/tests1.rs b/exercises/tests/tests1.rs
index 5eb918a..b37cefa 100644
--- a/exercises/tests/tests1.rs
+++ b/exercises/tests/tests1.rs
@@ -6,6 +6,8 @@
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Execute `rustlings hint tests1` for hints :)
 
+// I AM NOT DONE
+
 #[cfg(test)]
 mod tests {
     #[test]
diff --git a/exercises/tests/tests2.rs b/exercises/tests/tests2.rs
index 044ed9e..0d981ad 100644
--- a/exercises/tests/tests2.rs
+++ b/exercises/tests/tests2.rs
@@ -2,6 +2,8 @@
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Execute `rustlings hint tests2` for hints :)
 
+// I AM NOT DONE
+
 #[cfg(test)]
 mod tests {
     #[test]
diff --git a/exercises/tests/tests3.rs b/exercises/tests/tests3.rs
index 0f244b3..693b8aa 100644
--- a/exercises/tests/tests3.rs
+++ b/exercises/tests/tests3.rs
@@ -4,6 +4,8 @@
 // we expect to get when we call `is_even(5)`.
 // Execute `rustlings hint tests3` for hints :)
 
+// I AM NOT DONE
+
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
 }
diff --git a/exercises/threads/threads1.rs b/exercises/threads/threads1.rs
index 3308321..288ddd1 100644
--- a/exercises/threads/threads1.rs
+++ b/exercises/threads/threads1.rs
@@ -5,6 +5,8 @@
 // of "waiting..." and the program ends without timing out when running,
 // you've got it :)
 
+// I AM NOT DONE
+
 use std::sync::Arc;
 use std::thread;
 use std::time::Duration;
diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index 65452c2..5ddc37d 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -1,6 +1,13 @@
 // variables1.rs
 // Make me compile! Execute the command `rustlings hint variables1` if you want a hint :)
 
+// About this `I AM NOT DONE` thing:
+// We sometimes encourage you to keep trying things on a given exercise,
+// even after you already figured it out. If you got everything working and
+// feel ready for the next exercise, you the `I AM NOT DONE` comment below.
+
+// I AM NOT DONE
+
 fn main() {
     x = 5;
     println!("x has the value {}", x);
diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs
index 388b05d..7774a8f 100644
--- a/exercises/variables/variables2.rs
+++ b/exercises/variables/variables2.rs
@@ -1,6 +1,8 @@
 // variables2.rs
 // Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
 
+// I AM NOT DONE
+
 fn main() {
     let x;
     if x == 10 {
diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index f2c9c63..07b1a52 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -1,6 +1,8 @@
 // variables3.rs
 // Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
 
+// I AM NOT DONE
+
 fn main() {
     let x = 3;
     println!("Number {}", x);
diff --git a/exercises/variables/variables4.rs b/exercises/variables/variables4.rs
index f1ed6ef..77f1e9a 100644
--- a/exercises/variables/variables4.rs
+++ b/exercises/variables/variables4.rs
@@ -1,6 +1,8 @@
 // variables4.rs
 // Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
 
+// I AM NOT DONE
+
 fn main() {
     let x: i32;
     println!("Number {}", x);