Fixing clippy warnings

util/src/lib.rs

@@ -19,9 +19,17 @@
 #![feature(augmented_assignments)]
 #![feature(associated_consts)]
 #![feature(plugin)]
-#![plugin(clippy)]
-#![allow(needless_range_loop, match_bool)]
 #![feature(catch_panic)]
+// Clippy settings
+#![plugin(clippy)]
+// TODO [todr] not really sure
+#![allow(needless_range_loop)]
+// Shorter than if-else
+#![allow(match_bool)]
+// We use that to be more explicit about handled cases
+#![allow(match_same_arms)]
+// Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
+#![allow(clone_on_copy)]
 
 //! Ethcore-util library
 //!

util/src/panics.rs

@@ -104,7 +104,7 @@ impl<F> OnPanicListener for F
 }
 
 fn convert_to_string(t: &Box<Any + Send>) -> Option<String> {
-	let as_str = t.downcast_ref::<&'static str>().map(|t| t.clone().to_owned());
+	let as_str = t.downcast_ref::<&'static str>().cloned().map(|t| t.to_owned());
 	let as_string = t.downcast_ref::<String>().cloned();
 
 	as_str.or(as_string)