style: enable clippy pedantic

src/lib.rs

@@ -1,2 +1,5 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery, clippy::cargo)]
+#![allow(clippy::cargo_common_metadata)]
+
 pub mod mutate_in_closure;
 pub mod vec_any;

src/mutate_in_closure.rs

@@ -1,6 +1,8 @@
 use std::cell::RefCell;
 
-// Use RefCell to mutate a variable in a closure
+/// Use ``RefCell`` to mutate a variable in a closure
+/// # Panics
+///
 pub fn mutate_in_closure() {
   let my_string = RefCell::new("hello".to_string());
   let mutate = |new_val| {

src/vec_any.rs

@@ -33,8 +33,10 @@ trait AnyAnimal: Animal + AsAny {}
 impl<T: Animal + AsAny> AnyAnimal for T {}
 type BoxedAnimal = Box<dyn AnyAnimal>;
 
-// Demonstrates creating a vector of common Animal trait objects,
-// then downcasting to a concrete Dog type instance to be able to access its fields.
+/// Demonstrates creating a vector of common Animal trait objects,
+/// then downcasting to a concrete Dog type instance to be able to access its fields.
+/// # Panics
+///
 pub fn downcast_concrete_type_instance_from_trait_object() {
   let c = Cat {};
   let d = Dog { name: "Fido".to_string() };