feat(crabnet): fix warnings and test regression

* Remove the pointer extension trait for `NonNull` as of the `non_null_convenience` feature.
  CC: rust-lang/rust#117691
* Update the test stderr files, to match with the new error style.

Signed-off-by: Anhad Singh <[email protected]>

Author: Andy-Python-Programmer

src/lib.rs

@@ -1,5 +1,11 @@
 #![no_std]
-#![feature(allocator_api, trivial_bounds, new_uninit, associated_type_defaults)]
+#![feature(
+    non_null_convenience,
+    allocator_api,
+    trivial_bounds,
+    new_uninit,
+    associated_type_defaults
+)]
 
 extern crate alloc;
 
@@ -91,23 +97,6 @@ where
     fn into_boxed_bytes_in<A: Allocator>(self, alloc: A) -> Box<[u8], A>;
 }
 
-trait PointerExtension {
-    unsafe fn add(self, count: usize) -> Self;
-    unsafe fn sub(self, count: usize) -> Self;
-}
-
-impl<T> PointerExtension for NonNull<T> {
-    #[inline]
-    unsafe fn add(self, count: usize) -> Self {
-        NonNull::new_unchecked(self.as_ptr().add(count))
-    }
-
-    #[inline]
-    unsafe fn sub(self, count: usize) -> Self {
-        NonNull::new_unchecked(self.as_ptr().sub(count))
-    }
-}
-
 // impl for [T; N]
 unsafe impl<const N: usize, T> StackingAnchor<[T; N]> for [T; N] {}
 unsafe impl<const N: usize, T, U: Protocol> StackingAnchor<[T; N]> for crate::Stacked<U, [T; N]> {}

src/transport/tcp.rs

@@ -5,7 +5,7 @@ use byte_endian::BigEndian;
 use static_assertions::const_assert_eq;
 
 use crate::network::Ipv4;
-use crate::{Parsable, Parsed, PointerExtension, Protocol, Stack, Stacked, StackingAnchor};
+use crate::{Parsable, Parsed, Protocol, Stack, Stacked, StackingAnchor};
 
 #[derive(Default, Debug, Copy, Clone, PartialEq)]
 #[repr(transparent)]

src/transport/udp.rs

@@ -2,7 +2,7 @@ use byte_endian::BigEndian;
 use static_assertions::const_assert_eq;
 
 use crate::network::Ipv4;
-use crate::{Parsable, PointerExtension, Protocol, Stack, Stacked, StackingAnchor};
+use crate::{Parsable, Protocol, Stack, Stacked, StackingAnchor};
 
 #[repr(C, packed)]
 pub struct Udp {

tests/ui/udp_no_parent.stderr

@@ -7,10 +7,7 @@ error[E0599]: the method `into_boxed_bytes` exists for struct `Stacked<Udp, [u8;
  ::: src/lib.rs
   |
   | pub struct Stacked<U: Protocol, L: Protocol> {
-  | --------------------------------------------
-  | |
-  | doesn't satisfy `_: IntoBoxedBytes`
-  | doesn't satisfy `_: IsSafeToWrite`
+  | -------------------------------------------- doesn't satisfy `_: IntoBoxedBytes` or `_: IsSafeToWrite`
   |
   = note: the following trait bounds were not satisfied:
           `Stacked<crabnet::transport::Udp, [u8; 4]>: IsSafeToWrite`
@@ -29,10 +26,7 @@ error[E0599]: the method `into_boxed_bytes` exists for struct `Udp`, but its tra
  ::: src/transport/udp.rs
   |
   | pub struct Udp {
-  | --------------
-  | |
-  | doesn't satisfy `crabnet::transport::Udp: IntoBoxedBytes`
-  | doesn't satisfy `crabnet::transport::Udp: IsSafeToWrite`
+  | -------------- doesn't satisfy `crabnet::transport::Udp: IntoBoxedBytes` or `crabnet::transport::Udp: IsSafeToWrite`
   |
   = note: the following trait bounds were not satisfied:
           `crabnet::transport::Udp: IsSafeToWrite`

tests/ui/valid_parent.stderr

@@ -2,7 +2,7 @@ error[E0277]: the trait bound `Eth: StackingAnchor<Ipv4>` is not satisfied
  --> tests/ui/valid_parent.rs:8:17
   |
 8 |     let x = eth / udp;
-  |                 ^ the trait `StackingAnchor<Ipv4>` is not implemented for `Eth`
+  |                 ^ the trait `StackingAnchor<Ipv4>` is not implemented for `Eth`, which is required by `Eth: Div<_>`
   |
   = help: the trait `StackingAnchor<Eth>` is implemented for `Eth`
   = help: for that trait implementation, expected `Eth`, found `Ipv4`