Support Container attributes rename_all only for Serialize or Deserialize

serde_derive/src/internals/case.rs

@@ -10,7 +10,7 @@ use std::str::FromStr;
 use self::RenameRule::*;
 
 /// The different possible ways to change case of fields in a struct, or variants in an enum.
-#[derive(PartialEq)]
+#[derive(PartialEq, Copy, Clone)]
 pub enum RenameRule {
     /// Don't apply a default rename rule.
     None,