fix(ci): address new lints and float constant deprecations

README-quick-start.md

@@ -108,7 +108,6 @@ Basic operations on arrays are all element-wise; you need to use specific method
 ```rust
 use ndarray::prelude::*;
 use ndarray::Array;
-use std::f64::INFINITY as inf;
 
 fn main() {
     let a = array![
@@ -119,7 +118,7 @@ fn main() {
     assert_eq!(&a + &b, array![[10., 21., 32., 43.,]]);  // Allocates a new array. Note the explicit `&`.
     assert_eq!(&a - &b, array![[10., 19., 28., 37.,]]);
     assert_eq!(&a * &b, array![[0., 20., 60., 120.,]]);
-    assert_eq!(&a / &b, array![[inf, 20., 15., 13.333333333333334,]]);
+    assert_eq!(&a / &b, array![[f64::INFINITY, 20., 15., 13.333333333333334,]]);
 }
 ```
 

src/indexes.rs

@@ -57,10 +57,7 @@ where D: Dimension
     #[inline]
     fn next(&mut self) -> Option<Self::Item>
     {
-        let index = match self.index {
-            None => return None,
-            Some(ref ix) => ix.clone(),
-        };
+        let index = self.index.clone()?;
         self.index = self.dim.next_for(index.clone());
         Some(index.into_pattern())
     }

src/iterators/mod.rs

@@ -512,10 +512,7 @@ impl<'a, A, D: Dimension> Iterator for IndexedIter<'a, A, D>
     #[inline]
     fn next(&mut self) -> Option<Self::Item>
     {
-        let index = match self.0.inner.index {
-            None => return None,
-            Some(ref ix) => ix.clone(),
-        };
+        let index = self.0.inner.index.clone()?;
         match self.0.next() {
             None => None,
             Some(elem) => Some((index.into_pattern(), elem)),
@@ -695,10 +692,7 @@ impl<'a, A, D: Dimension> Iterator for IndexedIterMut<'a, A, D>
     #[inline]
     fn next(&mut self) -> Option<Self::Item>
     {
-        let index = match self.0.inner.index {
-            None => return None,
-            Some(ref ix) => ix.clone(),
-        };
+        let index = self.0.inner.index.clone()?;
         match self.0.next() {
             None => None,
             Some(elem) => Some((index.into_pattern(), elem)),

src/lib.rs

@@ -13,7 +13,6 @@
     clippy::deref_addrof,
     clippy::manual_map, // is not an error
     clippy::while_let_on_iterator, // is not an error
-    clippy::from_iter_instead_of_collect, // using from_iter is good style
     clippy::incompatible_msrv, // false positive PointerExt::offset
 )]
 #![doc(test(attr(deny(warnings))))]

tests/numeric.rs

@@ -4,7 +4,6 @@
 
 use approx::assert_abs_diff_eq;
 use ndarray::{arr0, arr1, arr2, array, aview1, Array, Array1, Array2, Array3, Axis};
-use std::f64;
 
 #[test]
 fn test_mean_with_nan_values()