diff --git a/compiler/rustc_codegen_cranelift/example/mini_core.rs b/compiler/rustc_codegen_cranelift/example/mini_core.rs
index 934e4b1786f..3607b7cd944 100644
--- a/compiler/rustc_codegen_cranelift/example/mini_core.rs
+++ b/compiler/rustc_codegen_cranelift/example/mini_core.rs
@@ -11,7 +11,7 @@
     thread_local
 )]
 #![no_core]
-#![allow(dead_code, internal_features)]
+#![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
 
 #[lang = "sized"]
 pub trait Sized {}
diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
index 81de7085e09..9003963300f 100644
--- a/library/alloc/tests/vec.rs
+++ b/library/alloc/tests/vec.rs
@@ -1974,7 +1974,7 @@ fn vec_macro_repeating_null_raw_fat_pointer() {
 
     let vec = vec![null_raw_dyn; 1];
     dbg!(ptr_metadata(vec[0]));
-    assert!(vec[0] == null_raw_dyn);
+    assert!(std::ptr::eq(vec[0], null_raw_dyn));
 
     // Polyfill for https://github.com/rust-lang/rfcs/pull/2580
 
diff --git a/src/tools/miri/tests/pass/pointers.rs b/src/tools/miri/tests/pass/pointers.rs
index 1525ded6151..c7b720dafa2 100644
--- a/src/tools/miri/tests/pass/pointers.rs
+++ b/src/tools/miri/tests/pass/pointers.rs
@@ -2,6 +2,7 @@
 //@[tree]compile-flags: -Zmiri-tree-borrows
 //@compile-flags: -Zmiri-permissive-provenance
 #![feature(ptr_metadata, const_raw_ptr_comparison)]
+#![allow(ambiguous_wide_pointer_comparisons)]
 
 use std::mem::{self, transmute};
 use std::ptr;
diff --git a/src/tools/miri/tests/pass/rc.rs b/src/tools/miri/tests/pass/rc.rs
index 6375abcd232..6dd1b3aff9e 100644
--- a/src/tools/miri/tests/pass/rc.rs
+++ b/src/tools/miri/tests/pass/rc.rs
@@ -3,6 +3,7 @@
 //@compile-flags: -Zmiri-strict-provenance
 #![feature(new_uninit)]
 #![feature(get_mut_unchecked)]
+#![allow(ambiguous_wide_pointer_comparisons)]
 
 use std::cell::{Cell, RefCell};
 use std::fmt::Debug;
diff --git a/tests/ui/issues/issue-17336.rs b/tests/ui/issues/issue-17336.rs
index 89ce59b11f2..97782ff9f0e 100644
--- a/tests/ui/issues/issue-17336.rs
+++ b/tests/ui/issues/issue-17336.rs
@@ -1,5 +1,8 @@
 // build-pass
+
 #![allow(unused_must_use)]
+#![allow(ambiguous_wide_pointer_comparisons)]
+
 #[allow(dead_code)]
 fn check(a: &str) {
     let x = a as *const str;
diff --git a/tests/ui/mir/mir_raw_fat_ptr.rs b/tests/ui/mir/mir_raw_fat_ptr.rs
index 6aceefbe715..f4a9afd2308 100644
--- a/tests/ui/mir/mir_raw_fat_ptr.rs
+++ b/tests/ui/mir/mir_raw_fat_ptr.rs
@@ -1,7 +1,9 @@
 // run-pass
 // check raw fat pointer ops in mir
 // FIXME: please improve this when we get monomorphization support
+
 #![feature(raw_ref_op)]
+#![allow(ambiguous_wide_pointer_comparisons)]
 
 use std::mem;