library/alloc/src/collections/vec_deque/macros.rs

   1 macro_rules! __impl_slice_eq1 {
   2     ([$($vars:tt)*] $lhs:ty, $rhs:ty, $($constraints:tt)*) => {
   3         #[stable(feature = "vec_deque_partial_eq_slice", since = "1.17.0")]
   4         impl<T, U, A: Allocator, $($vars)*> PartialEq<$rhs> for $lhs
   5         where
   6             T: PartialEq<U>,
   7             $($constraints)*
   8         {
   9             fn eq(&self, other: &$rhs) -> bool {
  10                 if self.len() != other.len() {
  11                     return false;
  12                 }
  13                 let (sa, sb) = self.as_slices();
  14                 let (oa, ob) = other[..].split_at(sa.len());
  15                 sa == oa && sb == ob
  16             }
  17         }
  18     }
  19 }