Allow dead code for all exercises and solutions

dev/Cargo.toml

@@ -203,19 +203,21 @@ panic = "abort"
 panic = "abort"
 
 [lints.rust]
-# You shouldn't write unsafe code in Rustlings
+# You shouldn't write unsafe code in Rustlings!
 unsafe_code = "forbid"
-# You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust
+# You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust.
 unstable_features = "forbid"
 
 [lints.clippy]
-# You forgot a `todo!()`
+# You forgot a `todo!()`!
 todo = "forbid"
-# This can only happen by mistake in Rustlings
+# This can only happen by mistake in Rustlings.
 empty_loop = "forbid"
-# No infinite loops are needed in Rustlings
+# No infinite loops are needed in Rustlings.
 infinite_loop = "deny"
-# You shouldn't leak memory while still learning Rust
+# You shouldn't leak memory while still learning Rust!
 mem_forget = "deny"
+# Dead code warnings can't be avoided in some exercises and might distract while learning.
+dead_code = "allow"
 # Currently, there are no disallowed methods. This line avoids problems when developing Rustlings.
 disallowed_methods = "allow"

exercises/08_enums/enums2.rs

@@ -1,5 +1,3 @@
-#![allow(dead_code)]
-
 #[derive(Debug)]
 struct Point {
     x: u64,

exercises/10_modules/modules2.rs

@@ -1,7 +1,6 @@
 // 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/15_traits/traits3.rs

@@ -1,5 +1,3 @@
-#![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

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

solutions/08_enums/enums2.rs

@@ -1,5 +1,3 @@
-#![allow(dead_code)]
-
 #[derive(Debug)]
 struct Point {
     x: u64,

solutions/10_modules/modules2.rs

@@ -1,4 +1,3 @@
-#[allow(dead_code)]
 mod delicious_snacks {
     // Added `pub` and used the expected alias after `as`.
     pub use self::fruits::PEAR as fruit;

solutions/15_traits/traits3.rs

@@ -1,5 +1,3 @@
-#![allow(dead_code)]
-
 trait Licensed {
     fn licensing_info(&self) -> String {
         "Default license".to_string()

solutions/19_smart_pointers/rc1.rs

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