diff --git a/src/ship/drops/box_drop_table.rs b/src/ship/drops/box_drop_table.rs
index 94abd84..f507d27 100644
--- a/src/ship/drops/box_drop_table.rs
+++ b/src/ship/drops/box_drop_table.rs
@@ -170,7 +170,7 @@ impl BoxDropTable {
                 else {
                     None
                 }
-            }).nth(0)
+            }).next()
     }
     
     fn random_box_drop<R: Rng>(&self, map_area: &MapArea, rng: &mut R) -> Option<ItemDropType> {
diff --git a/src/ship/drops/generic_weapon.rs b/src/ship/drops/generic_weapon.rs
index 71e578c..28a5007 100644
--- a/src/ship/drops/generic_weapon.rs
+++ b/src/ship/drops/generic_weapon.rs
@@ -266,30 +266,24 @@ impl AttributeTable {
     fn attributes<R: Rng>(&self, percent_pattern: &AttributePercentPattern, attribute_rate: &AttributeRate, rng: &mut R) -> [Option<WeaponAttribute>; 3] {
         let mut percents = vec![
             percent_pattern.attribute1.and_then(|pattern_type| {
-                self.generate_attribute(&pattern_type, &attribute_rate, rng)
+                self.generate_attribute(&pattern_type, attribute_rate, rng)
             }),
             percent_pattern.attribute2.and_then(|pattern_type| {
-                self.generate_attribute(&pattern_type, &attribute_rate, rng)
+                self.generate_attribute(&pattern_type, attribute_rate, rng)
             }),
             percent_pattern.attribute3.and_then(|pattern_type| {
-                self.generate_attribute(&pattern_type, &attribute_rate, rng)
+                self.generate_attribute(&pattern_type, attribute_rate, rng)
             }),
         ];
         percents.sort_by_key(|p| {
-            match p {
-                Some(a) => Some(a.attr),
-                None => None,
-            }
+            p.as_ref().map(|a| a.attr)
         });
         percents.dedup_by_key(|p| {
-            match p {
-                Some(a) => Some(a.attr),
-                None => None,
-            }
+            p.as_ref().map(|a| a.attr)
         });
         percents.iter()
             .fold(([None; 3], 0), |(mut acc, index), p| { // one day I'll be able to collece into an array
-                if let Some(_) = p {
+                if  p.is_some() {
                     acc[index] = *p;
                     (acc, index + 1)
                 }
diff --git a/src/ship/drops/mod.rs b/src/ship/drops/mod.rs
index edfa8db..8de0408 100644
--- a/src/ship/drops/mod.rs
+++ b/src/ship/drops/mod.rs
@@ -152,7 +152,7 @@ impl<R: Rng + SeedableRng> DropTable<R> {
             return None;
         }
 
-        if let Some(item) = self.rare_table.get_drop(map_area, &monster, &mut self.rng) {
+        if let Some(item) = self.rare_table.get_drop(map_area, monster, &mut self.rng) {
             return Some(item);
         }
 
diff --git a/src/ship/drops/rare_drop_table.rs b/src/ship/drops/rare_drop_table.rs
index df9ec8d..0ca356c 100644
--- a/src/ship/drops/rare_drop_table.rs
+++ b/src/ship/drops/rare_drop_table.rs
@@ -30,19 +30,18 @@ pub enum RareDropItem {
 impl RareDropItem {
     pub fn from_string(name: String) -> RareDropItem {
         let parse_funcs: [Box<dyn Fn(&String) -> Option<RareDropItem>>; 6] = [
-            Box::new(|i| Some(RareDropItem::Weapon(str::parse::<WeaponType>(&i).ok()?))),
-            Box::new(|i| Some(RareDropItem::Armor(str::parse::<ArmorType>(&i).ok()?))),
-            Box::new(|i| Some(RareDropItem::Shield(str::parse::<ShieldType>(&i).ok()?))),
-            Box::new(|i| Some(RareDropItem::Unit(str::parse::<UnitType>(&i).ok()?))),
-            Box::new(|i| Some(RareDropItem::Tool(str::parse::<ToolType>(&i).ok()?))),
-            Box::new(|i| Some(RareDropItem::Mag(str::parse::<MagType>(&i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Weapon(str::parse::<WeaponType>(i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Armor(str::parse::<ArmorType>(i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Shield(str::parse::<ShieldType>(i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Unit(str::parse::<UnitType>(i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Tool(str::parse::<ToolType>(i).ok()?))),
+            Box::new(|i| Some(RareDropItem::Mag(str::parse::<MagType>(i).ok()?))),
         ];
 
         for parse in parse_funcs.iter() {
-            match parse(&name) {
-                Some(k) => return k,
-                None => {},
-            }
+           if let Some (k) = parse(&name) {
+                return k
+           }
         }
 
         panic!()
@@ -151,7 +150,7 @@ impl RareDropTable {
                         else {
                             None
                         }
-                    }).nth(0)
+                    }).next()
             })
     }
 }