Auto merge of #134625 - compiler-errors:unsafe-binders-ty, r=oli-obk

Begin to implement type system layer of unsafe binders

Mostly TODOs, but there's a lot of match arms that are basically just noops so I wanted to split these out before I put up the MIR lowering/projection part of this logic.

r? oli-obk

Tracking:

- https://github.com/rust-lang/rust/issues/130516

clippy_lints/src/dereference.rs

@@ -877,7 +877,8 @@ fn for_mir_ty<'tcx>(tcx: TyCtxt<'tcx>, def_site_def_id: Option<DefId>, ty: Ty<'t
                 | ty::CoroutineClosure(..)
                 | ty::Never
                 | ty::Tuple(_)
-                | ty::Alias(ty::Projection, _) => Self::Deref,
+                | ty::Alias(ty::Projection, _)
+                | ty::UnsafeBinder(_) => Self::Deref,
             };
         }
     }

clippy_utils/src/visitors.rs

@@ -677,6 +677,9 @@ fn helper<'tcx, B>(
             ExprKind::Type(e, _) => {
                 helper(typeck, consume, e, f)?;
             },
+            ExprKind::UnsafeBinderCast(_, e, _) => {
+                helper(typeck, consume, e, f)?;
+            },
 
             // Either drops temporaries, jumps out of the current expression, or has no sub expression.
             ExprKind::DropTemps(_)
@@ -694,7 +697,6 @@ fn helper<'tcx, B>(
             | ExprKind::Continue(_)
             | ExprKind::InlineAsm(_)
             | ExprKind::OffsetOf(..)
-            | ExprKind::UnsafeBinderCast(..)
             | ExprKind::Err(_) => (),
         }
         ControlFlow::Continue(())