Importing rustc-1.66.1

Test: ./build.py --lto=thin
Change-Id: I8c59a688cb65b4edeee76b7be0946a902f9257c0
diff --git a/src/test/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr b/src/test/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr
index f3289e2..ea3d0d3 100644
--- a/src/test/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr
+++ b/src/test/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr
@@ -5,6 +5,11 @@
    |         - binding declared here but left uninitialized
 LL |     let y = x as *const i32;
    |             ^ `*x` used here but it isn't initialized
+   |
+help: consider assigning a value
+   |
+LL |     let x: &i32 = todo!();
+   |                 +++++++++
 
 error: aborting due to previous error