4 files changed, 13 insertions, 11 deletions

diff --git a/src/exhaustive.rs b/src/exhaustive.rs
index 23a490f..3f42876 100644
--- a/src/exhaustive.rs
+++ b/src/exhaustive.rs
@@ -16,7 +16,7 @@ impl<T> ExhaustiveSearch<T> {
     }
 
     /// Iterate over the items stored in this index.
-    pub fn iter(&self) -> Iter<T> {
+    pub fn iter(&self) -> Iter<'_, T> {
         self.into_iter()
     }
 
diff --git a/src/kd.rs b/src/kd.rs
index 332cabd..3c3699a 100644
--- a/src/kd.rs
+++ b/src/kd.rs
@@ -185,7 +185,7 @@ impl<T: Coordinates> KdTree<T> {
     }
 
     /// Iterate over the items stored in this tree.
-    pub fn iter(&self) -> Iter<T> {
+    pub fn iter(&self) -> Iter<'_, T> {
         self.into_iter()
     }
 
@@ -456,7 +456,7 @@ impl<T: Coordinates> FlatKdTree<T> {
     }
 
     /// Iterate over the items stored in this tree.
-    pub fn iter(&self) -> FlatIter<T> {
+    pub fn iter(&self) -> FlatIter<'_, T> {
         self.into_iter()
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 1e77f6b..29d351a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -122,6 +122,8 @@
 //! [`k_nearest_within()`]: knn::NearestNeighbors#method.k_nearest_within
 //! [`ExactNeighbors`]: knn::ExactNeighbors
 
+#![warn(rust_2018_idioms)]
+
 pub mod chebyshev;
 pub mod coords;
 pub mod cos;
diff --git a/src/vp.rs b/src/vp.rs
index 3e1a8ad..4417b6b 100644
--- a/src/vp.rs
+++ b/src/vp.rs
@@ -197,7 +197,7 @@ impl<T: Proximity> VpTree<T> {
     }
 
     /// Iterate over the items stored in this tree.
-    pub fn iter(&self) -> Iter<T> {
+    pub fn iter(&self) -> Iter<'_, T> {
         self.into_iter()
     }
 
@@ -246,7 +246,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_struct("VpTree")
             .field("root", &self.root)
             .finish()
@@ -295,7 +295,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_struct("IntoIter")
             .field("stack", &self.stack)
             .finish()
@@ -345,7 +345,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_struct("Iter")
             .field("stack", &self.stack)
             .finish()
@@ -504,7 +504,7 @@ impl<T: Proximity> FlatVpTree<T> {
     }
 
     /// Iterate over the items stored in this tree.
-    pub fn iter(&self) -> FlatIter<T> {
+    pub fn iter(&self) -> FlatIter<'_, T> {
         self.into_iter()
     }
 }
@@ -514,7 +514,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_struct("FlatVpTree")
             .field("nodes", &self.nodes)
             .finish()
@@ -535,7 +535,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_tuple("FlatIntoIter")
             .field(&self.0)
             .finish()
@@ -567,7 +567,7 @@ where
     T: Proximity + Debug,
     DistanceValue<T>: Debug,
 {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_tuple("FlatIter")
             .field(&self.0)
             .finish()