Add some more lints, and fix the compile errors they generate

src/entities/account.rs

@@ -82,6 +82,7 @@ fn string_or_bool<'de, D: Deserializer<'de>>(val: D) -> ::std::result::Result<bo
     })
 }
 
+#[derive(Debug)]
 pub struct CredentialsBuilder<'a> {
     display_name: Option<&'a str>,
     note: Option<&'a str>,

src/entities/instance.rs

@@ -37,7 +37,7 @@ pub struct StreamingApi {
 }
 
 /// Statistics about the Mastodon instance.
-#[derive(Debug, Clone, Deserialize)]
+#[derive(Debug, Clone, Copy, Deserialize)]
 pub struct Stats {
     user_count: u64,
     status_count: u64,

src/entities/itemsiter.rs

@@ -24,6 +24,7 @@ use serde::Deserialize;
 /// # Ok(())
 /// # }
 /// ```
+#[derive(Debug, Clone)]
 pub(crate) struct ItemsIter<'a, T: Clone + for<'de> Deserialize<'de>, H: 'a + HttpSend> {
     page: Page<'a, T, H>,
     buffer: Vec<T>,

src/entities/mention.rs

@@ -1,3 +1,4 @@
+#[derive(Debug, Clone)]
 pub struct Mention {
     /// URL of user's profile (can be remote)
     pub url: String,

src/entities/mod.rs

@@ -13,7 +13,7 @@ pub mod search_result;
 pub mod status;
 
 /// An empty JSON object.
-#[derive(Deserialize)]
+#[derive(Deserialize, Debug, Copy, Clone, PartialEq)]
 pub struct Empty {}
 
 pub mod prelude {

src/entities/notification.rs

@@ -20,18 +20,15 @@ pub struct Notification {
 }
 
 /// The type of notification.
-#[derive(Debug, Clone, Deserialize)]
+#[derive(Debug, Clone, Copy, Deserialize)]
+#[serde(rename_all = "lowercase")]
 pub enum NotificationType {
     /// Someone mentioned the application client in another status.
-    #[serde(rename = "mention")]
     Mention,
     /// Someone reblogged one of the application client's statuses.
-    #[serde(rename = "reblog")]
     Reblog,
     /// Someone favourited one of the application client's statuses.
-    #[serde(rename = "favourite")]
     Favourite,
     /// Someone followed the application client.
-    #[serde(rename = "follow")]
     Follow,
 }