message: Add full paths for some manually-implemented derives
  This further reduces the difference between pairing's manual and derived
  implementations.
diff: @@ -795,21 +795,21 @@ fn prime_field_impl(
  let top_limb_index = limbs - 1;
  quote!{
  - impl Copy for #name { }
  + impl ::std::marker::Copy for #name { }
  - impl Clone for #name {
  + impl ::std::clone::Clone for #name {
  fn clone(&self) -> #name {
  *self
  }
  }
  - impl PartialEq for #name {
  + impl ::std::cmp::PartialEq for #name {
  fn eq(&self, other: &#name) -> bool {
  self.0 == other.0
  }
  }
  - impl Eq for #name { }
  + impl ::std::cmp::Eq for #name { }
  impl ::std::fmt::Debug for #name
  {
  