Prepare for removal of safe_packed_borrows lint

src/lib.rs

@@ -590,8 +590,8 @@ macro_rules! __pin_project_internal {
 
             // Ensure that it's impossible to use pin projections on a #[repr(packed)] struct.
             //
-            // Taking a reference to a packed field is unsafe, amd appplying
-            // #[forbid(safe_packed_borrows)] makes sure that doing this without
+            // Taking a reference to a packed field is unsafe, and appplying
+            // #[forbid(unaligned_references)] makes sure that doing this without
             // an 'unsafe' block (which we deliberately do not generate)
             // is a hard error.
             //
@@ -601,7 +601,14 @@ macro_rules! __pin_project_internal {
             // a much nicer error above.
             //
             // See /~https://github.com/taiki-e/pin-project/pull/34 for more details.
-            #[forbid(safe_packed_borrows)]
+            //
+            // Lint-based tricks aren't perfect, but they're much better than nothing:
+            // /~https://github.com/taiki-e/pin-project-lite/issues/26
+            //
+            // TODO: Enable both lint as unaligned_references does not exist in older compilers.
+            // However, for now, disable safe_packed_borrows to see if unaligned_references is working.
+            // #[forbid(safe_packed_borrows)]
+            #[forbid(unaligned_references)]
             fn __assert_not_repr_packed <$($impl_generics)*> (this: &$ident <$($ty_generics)*>)
             $(where
                 $($where_clause)*)?