diff --git a/rust-version b/rust-version
index c3b3aed9a42..26d88f5b07b 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-c5cbf7852a7692c7c51df64c09a59e7838b55202
+4e880f8cbc191374ce7db335962489f41d6d4e3e
diff --git a/tests/compile-fail/validity/invalid_wide_raw.rs b/tests/compile-fail/validity/invalid_wide_raw.rs
index 6e0809b15ca..ac2d79b5a92 100644
--- a/tests/compile-fail/validity/invalid_wide_raw.rs
+++ b/tests/compile-fail/validity/invalid_wide_raw.rs
@@ -4,6 +4,7 @@ fn main() {
     trait T { }
     #[derive(Debug)]
     struct S {
+        #[allow(dead_code)]
         x: * mut dyn T
     }
     dbg!(S { x: unsafe { std::mem::transmute((0usize, 0usize)) } }); //~ ERROR: encountered dangling vtable pointer in wide pointer
diff --git a/tests/run-pass/issue-3794.rs b/tests/run-pass/issue-3794.rs
index fb1c19b04e9..5b5b22b5494 100644
--- a/tests/run-pass/issue-3794.rs
+++ b/tests/run-pass/issue-3794.rs
@@ -6,6 +6,7 @@ trait T {
 
 #[derive(Debug)]
 struct S {
+    #[allow(dead_code)]
     s: isize,
 }