clone EdnItem

edn/src/edn_item.rs

@@ -38,6 +38,18 @@ impl<T: PartialEq> PartialEq for EdnItem<T> {
         }
     }
 }
+impl EdnItem<&str> {
+    pub fn clone (&self) -> EdnItem<String> {
+        use EdnItem::*;
+        match self {
+            Nil    => Nil,
+            Num(u) => Num(*u),
+            Sym(u) => Sym(u.to_string()),
+            Key(u) => Key(u.to_string()),
+            Exp(e) => Exp(e.iter().map(|i|i.clone()).collect()),
+        }
+    }
+}
 impl<T: AsRef<str> + PartialEq + Default + Clone + std::fmt::Debug> EdnItem<T> {
     pub fn to_ref (&self) -> EdnItem<&str> {
         match self {