Fix all clippy warnings or block them.

rtiow/src/kdtree.rs

@@ -43,7 +43,7 @@ fn vec_split_into<T>(v: Vec<T>, offset: usize) -> (Vec<T>, Vec<T>) {
 
 impl KDTree {
     pub fn new(l: Vec<Box<Hit>>, t_min: f32, t_max: f32) -> KDTree {
-        if l.len() == 0 {
+        if l.is_empty() {
             panic!("Attempt to build k-d tree with no Hit objects");
         }
 
@@ -119,15 +119,15 @@ fn print_tree(f: &mut fmt::Formatter, depth: usize, kdt: &KDTree) -> fmt::Result
     let vol = kdt.volume();
     write!(f, "{:8.2}{}", vol, " ".repeat(depth * 2))?;
     match kdt {
-        KDTree::Leaf(ref hit) => write!(
+        KDTree::Leaf(ref hit) => writeln!(
             f,
-            "Leaf: {}\n",
+            "Leaf: {}",
             hit.bounding_box(0., 0.)
                 .map_or("NO BBOX".to_owned(), |bb| bb.to_string())
         )?,
-        KDTree::Branch { bbox, .. } => write!(
+        KDTree::Branch { bbox, .. } => writeln!(
             f,
-            "Branch: {}\n",
+            "Branch: {}",
             // TODO(wathiede): removing this .clone() results in a complaint about moving out
             // of a borrow.
             bbox.clone()
@@ -143,7 +143,7 @@ fn print_tree(f: &mut fmt::Formatter, depth: usize, kdt: &KDTree) -> fmt::Result
 
 impl fmt::Display for KDTree {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "kd-tree\n")?;
+        writeln!(f, "kd-tree")?;
         print_tree(f, 1, &self)
     }
 }