diff --git a/src/vector2d.rs b/src/vector2d.rs
index a90c1d9..b3aa335 100644
--- a/src/vector2d.rs
+++ b/src/vector2d.rs
@@ -45,22 +45,14 @@ where
     &mut v[y][x]
 }
 
-pub fn in_range<T, U>(v: &[Vec<U>], idx: &Vector2D<T>) -> bool
+pub fn in_range<I, C>(v: &[Vec<C>], idx: &Vector2D<I>) -> bool
 where
-    usize: TryInto<T>,
-    <usize as TryInto<T>>::Error: Debug,
-    usize: TryFrom<T>,
-    <usize as TryFrom<T>>::Error: Debug,
-    T: PartialOrd + Copy,
+    I: Copy,
+    usize: TryFrom<I>,
 {
-    idx.y >= 0.try_into().unwrap()
-        && idx.y < v.len().try_into().unwrap()
-        && idx.x >= 0.try_into().unwrap()
-        && idx.x
-            < v[TryInto::<usize>::try_into(idx.y).unwrap()]
-                .len()
-                .try_into()
-                .unwrap()
+    usize::try_from(idx.y)
+        .and_then(|y| usize::try_from(idx.x).map(|x| y < v.len() && x < v[y].len()))
+        .unwrap_or(false)
 }
 
 impl<T: Copy> Vector2D<T> {