Rollup merge of #73479 - pickfire:liballoc-spell, r=dtolnay

Minor tweaks to liballoc

src/liballoc/vec.rs

@@ -1639,7 +1639,7 @@ pub fn resize_default(&mut self, new_len: usize) {
     }
 }
 
-// This code generalises `extend_with_{element,default}`.
+// This code generalizes `extend_with_{element,default}`.
 trait ExtendWith<T> {
     fn next(&mut self) -> T;
     fn last(self) -> T;
@@ -1837,7 +1837,7 @@ unsafe trait IsZero {
 }
 
 macro_rules! impl_is_zero {
-    ($t: ty, $is_zero: expr) => {
+    ($t:ty, $is_zero:expr) => {
         unsafe impl IsZero for $t {
             #[inline]
             fn is_zero(&self) -> bool {
@@ -2362,9 +2362,9 @@ fn ne(&self, other: &$rhs) -> bool { self[..] != other[..] }
 __impl_slice_eq1! { [] Vec<A>, Vec<B>, }
 __impl_slice_eq1! { [] Vec<A>, &[B], }
 __impl_slice_eq1! { [] Vec<A>, &mut [B], }
+__impl_slice_eq1! { [] Cow<'_, [A]>, Vec<B>, A: Clone }
 __impl_slice_eq1! { [] Cow<'_, [A]>, &[B], A: Clone }
 __impl_slice_eq1! { [] Cow<'_, [A]>, &mut [B], A: Clone }
-__impl_slice_eq1! { [] Cow<'_, [A]>, Vec<B>, A: Clone }
 __impl_slice_eq1! { [const N: usize] Vec<A>, [B; N], [B; N]: LengthAtMost32 }
 __impl_slice_eq1! { [const N: usize] Vec<A>, &[B; N], [B; N]: LengthAtMost32 }