Fix most clippy lints, take more refeernces

Fix clippy lints and subsequently accept references for more function
parameters.

2 files changed, 6 insertions, 6 deletions

diff --git a/src/utils/message_builder.rs b/src/utils/message_builder.rs
index f94b3fd..b3599c2 100644
--- a/src/utils/message_builder.rs
+++ b/src/utils/message_builder.rs
@@ -162,7 +162,7 @@ impl MessageBuilder {
     /// ```
     ///
     /// [Display implementation]: ../model/struct.Emoji.html#method.fmt
-    pub fn emoji(mut self, emoji: Emoji) -> Self {
+    pub fn emoji(mut self, emoji: &Emoji) -> Self {
         let _ = write!(self.0, "{}", emoji);
 
         self
@@ -171,7 +171,7 @@ impl MessageBuilder {
     /// Mentions something that implements the [`Mentionable`] trait.
     ///
     /// [`Mentionable`]: ../model/trait.Mentionable.html
-    pub fn mention<M: Mentionable>(mut self, item: M) -> Self {
+    pub fn mention<M: Mentionable>(mut self, item: &M) -> Self {
         let _ = write!(self.0, "{}", item.mention());
 
         self
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 2660798..907d3a3 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -18,7 +18,7 @@ use model::misc::EmojiIdentifier;
 use std::collections::HashMap;
 use std::ffi::OsStr;
 use std::fs::File;
-use std::hash::Hash;
+use std::hash::{BuildHasher, Hash};
 use std::io::Read;
 use std::path::Path;
 
@@ -28,11 +28,11 @@ use cache::Cache;
 use CACHE;
 
 /// Converts a HashMap into a final `serde_json::Map` representation.
-pub fn hashmap_to_json_map<T>(map: HashMap<T, Value>) -> Map<String, Value>
-    where T: Eq + Hash + ToString {
+pub fn hashmap_to_json_map<H, T>(map: HashMap<T, Value, H>)
+    -> Map<String, Value> where H: BuildHasher, T: Eq + Hash + ToString {
     let mut json_map = Map::new();
 
-    for (key, value) in map.into_iter() {
+    for (key, value) in map {
         json_map.insert(key.to_string(), value);
     }