diff --git a/src/tools/miri/tests/fail/erroneous_const.rs b/src/tools/miri/tests/fail/erroneous_const.rs
index c35a9050359..d14998ccba2 100644
--- a/src/tools/miri/tests/fail/erroneous_const.rs
+++ b/src/tools/miri/tests/fail/erroneous_const.rs
@@ -3,7 +3,6 @@
 // Inlining changes the error location
 //@compile-flags: -Zmir-opt-level=0
 #![feature(never_type)]
-#![warn(warnings, const_err)]
 
 struct PrintName<T>(T);
 impl<T> PrintName<T> {
diff --git a/src/tools/miri/tests/fail/erroneous_const2.rs b/src/tools/miri/tests/fail/erroneous_const2.rs
index 6628166cfac..9a1a970778f 100644
--- a/src/tools/miri/tests/fail/erroneous_const2.rs
+++ b/src/tools/miri/tests/fail/erroneous_const2.rs
@@ -1,13 +1,9 @@
 const X: u32 = 5;
 const Y: u32 = 6;
 const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
-//~^ERROR: any use of this value
-//~|WARN: previously accepted
+//~^ERROR: evaluation of constant value failed
 
 #[rustfmt::skip] // rustfmt bug: https://github.com/rust-lang/rustfmt/issues/5391
 fn main() {
-    println!("{}", FOO); //~ERROR: post-monomorphization error
-    //~|ERROR: evaluation of constant value failed
-    //~|ERROR: erroneous constant used
-    //~|WARN: previously accepted
+    println!("{}", FOO);
 }
diff --git a/src/tools/miri/tests/fail/erroneous_const2.stderr b/src/tools/miri/tests/fail/erroneous_const2.stderr
index 4d402257b8b..d41fcfd2302 100644
--- a/src/tools/miri/tests/fail/erroneous_const2.stderr
+++ b/src/tools/miri/tests/fail/erroneous_const2.stderr
@@ -1,39 +1,9 @@
-error: any use of this value will cause an error
-  --> $DIR/erroneous_const2.rs:LL:CC
-   |
-LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
-   | --------------    ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow
-   |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
-   = note: `#[deny(const_err)]` on by default
-
 error[E0080]: evaluation of constant value failed
   --> $DIR/erroneous_const2.rs:LL:CC
    |
-LL |     println!("{}", FOO);
-   |                    ^^^ referenced constant has errors
+LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
+   |                   ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow
 
-error: erroneous constant used
-  --> $DIR/erroneous_const2.rs:LL:CC
-   |
-LL |     println!("{}", FOO);
-   |                    ^^^ referenced constant has errors
-   |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
-   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error: post-monomorphization error: referenced constant has errors
-  --> $DIR/erroneous_const2.rs:LL:CC
-   |
-LL |     println!("{}", FOO);
-   |                    ^^^ referenced constant has errors
-   |
-   = note: inside `main` at $DIR/erroneous_const2.rs:LL:CC
-
-note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
-
-error: aborting due to 4 previous errors
+error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0080`.
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.rs b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.rs
index 73adc4dc449..47d1f782cb6 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.rs
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.rs
@@ -3,7 +3,7 @@
 
 fn main() {
     // Try many times as this might work by chance.
-    for _ in 0..10 {
+    for _ in 0..20 {
         let x = [2u16, 3, 4]; // Make it big enough so we don't get an out-of-bounds error.
         let x = &x[0] as *const _ as *const u32;
         // This must fail because alignment is violated: the allocation's base is not sufficiently aligned.
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_addr_of.rs b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_addr_of.rs
index e439cf2b03b..f1032ab52bc 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_addr_of.rs
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_addr_of.rs
@@ -4,7 +4,7 @@
 
 fn main() {
     // Try many times as this might work by chance.
-    for _ in 0..10 {
+    for _ in 0..20 {
         let x = [2u16, 3, 4]; // Make it big enough so we don't get an out-of-bounds error.
         let x = &x[0] as *const _ as *const u32;
         // This must fail because alignment is violated: the allocation's base is not sufficiently aligned.