rustfmt the exercises

Signed-off-by: Eddy Petrisor <eddy.petrisor@gmail.com>

exercises/error_handling/errors2.rs

@@ -32,10 +32,7 @@ mod tests {
 
     #[test]
     fn item_quantity_is_a_valid_number() {
-        assert_eq!(
-            total_cost("34"),
-            Ok(171)
-        );
+        assert_eq!(total_cost("34"), Ok(171));
     }
 
     #[test]

exercises/error_handling/errorsn.rs

@@ -65,7 +65,7 @@ fn test_ioerror() {
     assert_eq!("uh-oh!", read_and_validate(&mut b).unwrap_err().to_string());
 }
 
-#[derive(PartialEq,Debug)]
+#[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
 
 impl PositiveNonzeroInteger {
@@ -83,11 +83,14 @@ impl PositiveNonzeroInteger {
 #[test]
 fn test_positive_nonzero_integer_creation() {
     assert!(PositiveNonzeroInteger::new(10).is_ok());
-    assert_eq!(Err(CreationError::Negative), PositiveNonzeroInteger::new(-10));
+    assert_eq!(
+        Err(CreationError::Negative),
+        PositiveNonzeroInteger::new(-10)
+    );
     assert_eq!(Err(CreationError::Zero), PositiveNonzeroInteger::new(0));
 }
 
-#[derive(PartialEq,Debug)]
+#[derive(PartialEq, Debug)]
 enum CreationError {
     Negative,
     Zero,

exercises/error_handling/option1.rs

@@ -11,7 +11,10 @@ fn main() {
     println!("The last item in the list is {:?}", last);
 
     let second_to_last = list.pop().unwrap();
-    println!("The second-to-last item in the list is {:?}", second_to_last);
+    println!(
+        "The second-to-last item in the list is {:?}",
+        second_to_last
+    );
 }
 
 

exercises/error_handling/result1.rs

@@ -1,10 +1,10 @@
 // result1.rs
 // Make this test pass! Scroll down for hints :)
 
-#[derive(PartialEq,Debug)]
+#[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
 
-#[derive(PartialEq,Debug)]
+#[derive(PartialEq, Debug)]
 enum CreationError {
     Negative,
     Zero,
@@ -19,7 +19,10 @@ impl PositiveNonzeroInteger {
 #[test]
 fn test_creation() {
     assert!(PositiveNonzeroInteger::new(10).is_ok());
-    assert_eq!(Err(CreationError::Negative), PositiveNonzeroInteger::new(-10));
+    assert_eq!(
+        Err(CreationError::Negative),
+        PositiveNonzeroInteger::new(-10)
+    );
     assert_eq!(Err(CreationError::Zero), PositiveNonzeroInteger::new(0));
 }