Add explicit '_ lifetimes to generic types

1 files changed, 2 insertions, 0 deletions

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;