Following clippy lints

Author: ZuseZ4

src/slice.rs

@@ -110,18 +110,12 @@ copy_and_clone! {SliceOrIndex}
 impl SliceOrIndex {
     /// Returns `true` if `self` is a `Slice` value.
     pub fn is_slice(&self) -> bool {
-        match self {
-            SliceOrIndex::Slice { .. } => true,
-            _ => false,
-        }
+        matches!(self, SliceOrIndex::Slice { .. })
     }
 
     /// Returns `true` if `self` is an `Index` value.
     pub fn is_index(&self) -> bool {
-        match self {
-            SliceOrIndex::Index(_) => true,
-            _ => false,
-        }
+        matches!(self, SliceOrIndex::Index(_))
     }
 
     /// Returns a new `SliceOrIndex` with the given step size (multiplied with

src/stacking.rs

@@ -165,7 +165,7 @@ where
     let mut res = Array::from_shape_vec(res_dim, v)?;
 
     res.axis_iter_mut(axis)
-        .zip(arrays.into_iter())
+        .zip(arrays.iter())
         .for_each(|(mut assign_view, array)| {
             assign_view.assign(&array);
         });