Fix warnings

exercises/06_move_semantics/move_semantics5.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::ptr_arg)]
+
 // TODO: Fix the compiler errors without changing anything except adding or
 // removing references (the character `&`).
 

exercises/08_enums/enums2.rs

@@ -1,3 +1,4 @@
+#[allow(dead_code)]
 #[derive(Debug)]
 enum Message {
     // TODO: Define the different variants used below.
@@ -5,7 +6,7 @@ enum Message {
 
 impl Message {
     fn call(&self) {
-        println!("{:?}", self);
+        println!("{self:?}");
     }
 }
 

exercises/10_modules/modules2.rs

@@ -1,6 +1,7 @@
 // You can bring module paths into scopes and provide new names for them with
 // the `use` and `as` keywords.
 
+#[allow(dead_code)]
 mod delicious_snacks {
     // TODO: Add the following two `use` statements after fixing them.
     // use self::fruits::PEAR as ???;

exercises/13_error_handling/errors4.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::comparison_chain)]
+
 #[derive(PartialEq, Debug)]
 enum CreationError {
     Negative,

exercises/13_error_handling/errors6.rs

@@ -35,7 +35,7 @@ impl PositiveNonzeroInteger {
     fn new(value: i64) -> Result<Self, CreationError> {
         match value {
             x if x < 0 => Err(CreationError::Negative),
-            x if x == 0 => Err(CreationError::Zero),
+            0 => Err(CreationError::Zero),
             x => Ok(Self(x as u64)),
         }
     }
@@ -55,7 +55,6 @@ fn main() {
 #[cfg(test)]
 mod test {
     use super::*;
-    use std::num::IntErrorKind;
 
     #[test]
     fn test_parse_error() {

exercises/15_traits/traits3.rs

@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 trait Licensed {
     // TODO: Add a default implementation for `licensing_info` so that
     // implementors like the two structs below can share that default behavior

exercises/19_smart_pointers/rc1.rs

@@ -8,6 +8,7 @@ use std::rc::Rc;
 #[derive(Debug)]
 struct Sun;
 
+#[allow(dead_code)]
 #[derive(Debug)]
 enum Planet {
     Mercury(Rc<Sun>),