Fix CI failures (mostly linting with clippy)

Cargo.toml

@@ -3,6 +3,7 @@
 name = "ndarray"
 version = "0.15.5"
 edition = "2018"
+rust-version = "1.51"
 authors = [
   "Ulrik Sverdrup \"bluss\"",
   "Jim Turner"

src/arrayformat.rs

@@ -189,7 +189,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::Display, S, D: Dimension> fmt::Display for ArrayBase<S, D>
+impl<A: fmt::Display, S, D: Dimension> fmt::Display for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {
@@ -203,7 +203,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::Debug, S, D: Dimension> fmt::Debug for ArrayBase<S, D>
+impl<A: fmt::Debug, S, D: Dimension> fmt::Debug for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {
@@ -217,7 +217,7 @@ where
             ", shape={:?}, strides={:?}, layout={:?}",
             self.shape(),
             self.strides(),
-            layout = self.view().layout()
+            self.view().layout(),
         )?;
         match D::NDIM {
             Some(ndim) => write!(f, ", const ndim={}", ndim)?,
@@ -231,7 +231,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::LowerExp, S, D: Dimension> fmt::LowerExp for ArrayBase<S, D>
+impl<A: fmt::LowerExp, S, D: Dimension> fmt::LowerExp for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {
@@ -245,7 +245,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::UpperExp, S, D: Dimension> fmt::UpperExp for ArrayBase<S, D>
+impl<A: fmt::UpperExp, S, D: Dimension> fmt::UpperExp for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {
@@ -258,7 +258,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::LowerHex, S, D: Dimension> fmt::LowerHex for ArrayBase<S, D>
+impl<A: fmt::LowerHex, S, D: Dimension> fmt::LowerHex for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {
@@ -272,7 +272,7 @@ where
 /// to each element.
 ///
 /// The array is shown in multiline style.
-impl<'a, A: fmt::Binary, S, D: Dimension> fmt::Binary for ArrayBase<S, D>
+impl<A: fmt::Binary, S, D: Dimension> fmt::Binary for ArrayBase<S, D>
 where
     S: Data<Elem = A>,
 {

src/arraytraits.rs

@@ -252,7 +252,7 @@ where
     }
 }
 
-impl<'a, S, D> hash::Hash for ArrayBase<S, D>
+impl<S, D> hash::Hash for ArrayBase<S, D>
 where
     D: Dimension,
     S: Data,

src/data_traits.rs

@@ -162,6 +162,7 @@ pub unsafe trait DataMut: Data + RawDataMut {
     /// Returns whether the array has unique access to its data.
     #[doc(hidden)]
     #[inline]
+    #[allow(clippy::wrong_self_convention)]  // mut needed for Arc types
     fn is_unique(&mut self) -> bool {
         self.try_is_unique().unwrap()
     }

src/dimension/dimension_trait.rs

@@ -293,7 +293,7 @@ pub trait Dimension:
         let mut cstride = 1;
         for &i in order.slice() {
             // a dimension of length 1 can have unequal strides
-            if dim_slice[i] != 1 && (strides[i] as isize).abs() as usize != cstride {
+            if dim_slice[i] != 1 && (strides[i] as isize).unsigned_abs() != cstride {
                 return false;
             }
             cstride *= dim_slice[i];

src/dimension/dynindeximpl.rs

@@ -21,7 +21,7 @@ impl<T> Deref for IxDynRepr<T> {
                 debug_assert!(len as usize <= ar.len());
                 unsafe { ar.get_unchecked(..len as usize) }
             }
-            IxDynRepr::Alloc(ref ar) => &*ar,
+            IxDynRepr::Alloc(ref ar) => ar,
         }
     }
 }
@@ -33,7 +33,7 @@ impl<T> DerefMut for IxDynRepr<T> {
                 debug_assert!(len as usize <= ar.len());
                 unsafe { ar.get_unchecked_mut(..len as usize) }
             }
-            IxDynRepr::Alloc(ref mut ar) => &mut *ar,
+            IxDynRepr::Alloc(ref mut ar) => ar,
         }
     }
 }

src/dimension/mod.rs

@@ -185,7 +185,7 @@ where
         .try_fold(0usize, |acc, (&d, &s)| {
             let s = s as isize;
             // Calculate maximum possible absolute movement along this axis.
-            let off = d.saturating_sub(1).checked_mul(s.abs() as usize)?;
+            let off = d.saturating_sub(1).checked_mul(s.unsigned_abs())?;
             acc.checked_add(off)
         })
         .ok_or_else(|| from_kind(ErrorKind::Overflow))?;
@@ -333,7 +333,7 @@ where
     }
 }
 
-impl<'a> DimensionExt for [Ix] {
+impl DimensionExt for [Ix] {
     #[inline]
     fn axis(&self, axis: Axis) -> Ix {
         self[axis.index()]
@@ -457,7 +457,7 @@ pub fn do_slice(dim: &mut usize, stride: &mut usize, slice: Slice) -> isize {
     };
 
     // Update dimension.
-    let abs_step = step.abs() as usize;
+    let abs_step = step.unsigned_abs();
     *dim = if abs_step == 1 {
         m
     } else {
@@ -651,7 +651,7 @@ pub fn slices_intersect<D: Dimension>(
                     Some(m) => m,
                     None => return false,
                 };
-                if ind < min || ind > max || (ind - min) % step.abs() as usize != 0 {
+                if ind < min || ind > max || (ind - min) % step.unsigned_abs() != 0 {
                     return false;
                 }
             }

src/dimension/ndindex.rs

@@ -230,7 +230,7 @@ unsafe impl<'a> NdIndex<IxDyn> for &'a IxDyn {
 
 unsafe impl<'a> NdIndex<IxDyn> for &'a [Ix] {
     fn index_checked(&self, dim: &IxDyn, strides: &IxDyn) -> Option<isize> {
-        stride_offset_checked(dim.ix(), strides.ix(), *self)
+        stride_offset_checked(dim.ix(), strides.ix(), self)
     }
     fn index_unchecked(&self, strides: &IxDyn) -> isize {
         zip(strides.ix(), *self)

src/impl_constructors.rs

@@ -634,6 +634,7 @@ where
 
     #[deprecated(note = "This method is hard to use correctly. Use `uninit` instead.",
                  since = "0.15.0")]
+    #[allow(clippy::uninit_vec)]  // this is explicitly intended to create uninitialized memory
     /// Create an array with uninitialized elements, shape `shape`.
     ///
     /// Prefer to use [`uninit()`](ArrayBase::uninit) if possible, because it is

src/iterators/lanes.rs

@@ -39,17 +39,16 @@ impl<'a, A, D: Dimension> Lanes<'a, A, D> {
         let ndim = v.ndim();
         let len;
         let stride;
-        let iter_v;
-        if ndim == 0 {
+        let iter_v = if ndim == 0 {
             len = 1;
             stride = 1;
-            iter_v = v.try_remove_axis(Axis(0))
+            v.try_remove_axis(Axis(0))
         } else {
             let i = axis.index();
             len = v.dim[i];
             stride = v.strides[i] as isize;
-            iter_v = v.try_remove_axis(axis)
-        }
+            v.try_remove_axis(axis)
+        };
         Lanes {
             inner_len: len,
             inner_stride: stride,
@@ -108,17 +107,16 @@ impl<'a, A, D: Dimension> LanesMut<'a, A, D> {
         let ndim = v.ndim();
         let len;
         let stride;
-        let iter_v;
-        if ndim == 0 {
+        let iter_v = if ndim == 0 {
             len = 1;
             stride = 1;
-            iter_v = v.try_remove_axis(Axis(0))
+            v.try_remove_axis(Axis(0))
         } else {
             let i = axis.index();
             len = v.dim[i];
             stride = v.strides[i] as isize;
-            iter_v = v.try_remove_axis(axis)
-        }
+            v.try_remove_axis(axis)
+        };
         LanesMut {
             inner_len: len,
             inner_stride: stride,

src/iterators/mod.rs

@@ -103,7 +103,7 @@ impl<A, D: Dimension> Iterator for Baseiter<A, D> {
     }
 }
 
-impl<'a, A, D: Dimension> ExactSizeIterator for Baseiter<A, D> {
+impl<A, D: Dimension> ExactSizeIterator for Baseiter<A, D> {
     fn len(&self) -> usize {
         match self.index {
             None => 0,

src/itertools.rs

@@ -86,7 +86,8 @@ where
 /// **Note:** To enable the macros in this crate, use the `#[macro_use]`
 /// attribute when importing the crate:
 ///
-/// ```
+/// ```no_run
+/// # #[allow(unused_imports)]
 /// #[macro_use] extern crate itertools;
 /// # fn main() { }
 /// ```