Merging upstream version 1.69.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

22 files changed, 236 insertions, 36 deletions

diff --git a/tests/ui/consts/const-eval/const-eval-query-stack.rs b/tests/ui/consts/const-eval/const-eval-query-stack.rs
index 8f8a8cee3..81f28c175 100644
--- a/tests/ui/consts/const-eval/const-eval-query-stack.rs
+++ b/tests/ui/consts/const-eval/const-eval-query-stack.rs
@@ -1,8 +1,7 @@
 // compile-flags: -Ztreat-err-as-bug=1
 // failure-status: 101
 // rustc-env:RUST_BACKTRACE=1
-// normalize-stderr-test "\nerror: internal compiler error.*\n\n" -> ""
-// normalize-stderr-test "note:.*unexpectedly panicked.*\n\n" -> ""
+// normalize-stderr-test "\nerror: .*unexpectedly panicked.*\n\n" -> ""
 // normalize-stderr-test "note: we would appreciate a bug report.*\n\n" -> ""
 // normalize-stderr-test "note: compiler flags.*\n\n" -> ""
 // normalize-stderr-test "note: rustc.*running on.*\n\n" -> ""
diff --git a/tests/ui/consts/const-eval/const-eval-query-stack.stderr b/tests/ui/consts/const-eval/const-eval-query-stack.stderr
index b97975c4c..01fb8153c 100644
--- a/tests/ui/consts/const-eval/const-eval-query-stack.stderr
+++ b/tests/ui/consts/const-eval/const-eval-query-stack.stderr
@@ -1,5 +1,5 @@
 error[E0080]: evaluation of constant value failed
-  --> $DIR/const-eval-query-stack.rs:17:16
+  --> $DIR/const-eval-query-stack.rs:16:16
    |
 LL | const X: i32 = 1 / 0;
    |                ^^^^^ attempt to divide `1_i32` by zero
diff --git a/tests/ui/consts/const-eval/const-eval-span.rs b/tests/ui/consts/const-eval/const-eval-span.rs
index 82f101b47..1667c77d1 100644
--- a/tests/ui/consts/const-eval/const-eval-span.rs
+++ b/tests/ui/consts/const-eval/const-eval-span.rs
@@ -8,7 +8,7 @@ const CONSTANT: S = S(0);
 enum E {
     V = CONSTANT,
     //~^ ERROR mismatched types
-    //~| expected `isize`, found struct `S`
+    //~| expected `isize`, found `S`
 }
 
 fn main() {}
diff --git a/tests/ui/consts/const-eval/const-eval-span.stderr b/tests/ui/consts/const-eval/const-eval-span.stderr
index c5b001899..fe33ad490 100644
--- a/tests/ui/consts/const-eval/const-eval-span.stderr
+++ b/tests/ui/consts/const-eval/const-eval-span.stderr
@@ -2,7 +2,7 @@ error[E0308]: mismatched types
   --> $DIR/const-eval-span.rs:9:9
    |
 LL |     V = CONSTANT,
-   |         ^^^^^^^^ expected `isize`, found struct `S`
+   |         ^^^^^^^^ expected `isize`, found `S`
 
 error: aborting due to previous error
 
diff --git a/tests/ui/consts/const-eval/infinite_loop.stderr b/tests/ui/consts/const-eval/infinite_loop.stderr
index 8b58cb279..f30bfaf3f 100644
--- a/tests/ui/consts/const-eval/infinite_loop.stderr
+++ b/tests/ui/consts/const-eval/infinite_loop.stderr
@@ -1,8 +1,11 @@
 error[E0080]: evaluation of constant value failed
-  --> $DIR/infinite_loop.rs:6:15
+  --> $DIR/infinite_loop.rs:6:9
    |
-LL |         while n != 0 {
-   |               ^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+LL | /         while n != 0 {
+LL | |
+LL | |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
+LL | |         }
+   | |_________^ exceeded interpreter step limit (see `#[const_eval_limit]`)
 
 error: aborting due to previous error
 
diff --git a/tests/ui/consts/const-eval/issue-52475.rs b/tests/ui/consts/const-eval/issue-52475.rs
index ce65407bb..307c1a668 100644
--- a/tests/ui/consts/const-eval/issue-52475.rs
+++ b/tests/ui/consts/const-eval/issue-52475.rs
@@ -2,8 +2,8 @@ fn main() {
     let _ = [(); {
         let mut x = &0;
         let mut n = 0;
-        while n < 5 {
-            n = (n + 1) % 5; //~ ERROR evaluation of constant value failed
+        while n < 5 { //~ ERROR evaluation of constant value failed [E0080]
+            n = (n + 1) % 5;
             x = &0; // Materialize a new AllocId
         }
         0
diff --git a/tests/ui/consts/const-eval/issue-52475.stderr b/tests/ui/consts/const-eval/issue-52475.stderr
index 8536ff02c..3aa6bd277 100644
--- a/tests/ui/consts/const-eval/issue-52475.stderr
+++ b/tests/ui/consts/const-eval/issue-52475.stderr
@@ -1,8 +1,11 @@
 error[E0080]: evaluation of constant value failed
-  --> $DIR/issue-52475.rs:6:17
+  --> $DIR/issue-52475.rs:5:9
    |
-LL |             n = (n + 1) % 5;
-   |                 ^^^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+LL | /         while n < 5 {
+LL | |             n = (n + 1) % 5;
+LL | |             x = &0; // Materialize a new AllocId
+LL | |         }
+   | |_________^ exceeded interpreter step limit (see `#[const_eval_limit]`)
 
 error: aborting due to previous error
 
diff --git a/tests/ui/consts/const-eval/issue-91827-extern-types.rs b/tests/ui/consts/const-eval/issue-91827-extern-types.rs
index 43c99799f..c9aaa6e55 100644
--- a/tests/ui/consts/const-eval/issue-91827-extern-types.rs
+++ b/tests/ui/consts/const-eval/issue-91827-extern-types.rs
@@ -28,7 +28,10 @@ pub struct ListImpl<T, const N: usize> {
 
 impl<T> List<T> {
     const fn as_slice(&self) -> &[T] {
-        unsafe { std::slice::from_raw_parts(self.data.as_ptr(), self.len) }
+        unsafe {
+            let ptr = addr_of!(self.tail) as *const T;
+            std::slice::from_raw_parts(ptr, self.len)
+        }
     }
 }
 
diff --git a/tests/ui/consts/const-eval/raw-bytes.32bit.stderr b/tests/ui/consts/const-eval/raw-bytes.32bit.stderr
index 91a426580..a0f8dd097 100644
--- a/tests/ui/consts/const-eval/raw-bytes.32bit.stderr
+++ b/tests/ui/consts/const-eval/raw-bytes.32bit.stderr
@@ -167,7 +167,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/raw-bytes.rs:96:1
    |
 LL | const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: 4, align: 4) {
@@ -178,7 +178,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/raw-bytes.rs:99:1
    |
 LL | const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: 4, align: 4) {
diff --git a/tests/ui/consts/const-eval/raw-bytes.64bit.stderr b/tests/ui/consts/const-eval/raw-bytes.64bit.stderr
index e4c5e62f6..9706f3ec2 100644
--- a/tests/ui/consts/const-eval/raw-bytes.64bit.stderr
+++ b/tests/ui/consts/const-eval/raw-bytes.64bit.stderr
@@ -167,7 +167,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/raw-bytes.rs:96:1
    |
 LL | const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: 8, align: 8) {
@@ -178,7 +178,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/raw-bytes.rs:99:1
    |
 LL | const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: 8, align: 8) {
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.rs b/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.rs
new file mode 100644
index 000000000..c59596238
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.rs
@@ -0,0 +1,36 @@
+// check-fail
+// compile-flags: -Z tiny-const-eval-limit
+
+const fn foo() {}
+
+const fn call_foo() -> u32 {
+    foo();
+    foo();
+    foo();
+    foo();
+    foo();
+
+    foo();
+    foo();
+    foo();
+    foo();
+    foo();
+
+    foo();
+    foo();
+    foo();
+    foo();
+    foo();
+
+    foo();
+    foo();
+    foo();
+    foo(); //~ ERROR evaluation of constant value failed [E0080]
+    0
+}
+
+const X: u32 = call_foo();
+
+fn main() {
+    println!("{X}");
+}
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.stderr b/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.stderr
new file mode 100644
index 000000000..ed70975af
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-fn-call.stderr
@@ -0,0 +1,20 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ctfe-fn-call.rs:28:5
+   |
+LL |     foo();
+   |     ^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+   |
+note: inside `call_foo`
+  --> $DIR/ctfe-fn-call.rs:28:5
+   |
+LL |     foo();
+   |     ^^^^^
+note: inside `X`
+  --> $DIR/ctfe-fn-call.rs:32:16
+   |
+LL | const X: u32 = call_foo();
+   |                ^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.rs b/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.rs
new file mode 100644
index 000000000..c10b8d837
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.rs
@@ -0,0 +1,19 @@
+// check-fail
+// compile-flags: -Z tiny-const-eval-limit
+
+const fn labelled_loop(n: u32) -> u32 {
+    let mut i = 0;
+    'mylabel: loop { //~ ERROR evaluation of constant value failed [E0080]
+        if i > n {
+            break 'mylabel
+        }
+        i += 1;
+    }
+    0
+}
+
+const X: u32 = labelled_loop(19);
+
+fn main() {
+    println!("{X}");
+}
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.stderr b/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.stderr
new file mode 100644
index 000000000..d9404edd5
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-labelled-loop.stderr
@@ -0,0 +1,30 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ctfe-labelled-loop.rs:6:5
+   |
+LL | /     'mylabel: loop {
+LL | |         if i > n {
+LL | |             break 'mylabel
+LL | |         }
+LL | |         i += 1;
+LL | |     }
+   | |_____^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+   |
+note: inside `labelled_loop`
+  --> $DIR/ctfe-labelled-loop.rs:6:5
+   |
+LL | /     'mylabel: loop {
+LL | |         if i > n {
+LL | |             break 'mylabel
+LL | |         }
+LL | |         i += 1;
+LL | |     }
+   | |_____^
+note: inside `X`
+  --> $DIR/ctfe-labelled-loop.rs:15:16
+   |
+LL | const X: u32 = labelled_loop(19);
+   |                ^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.rs b/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.rs
new file mode 100644
index 000000000..80ff835f3
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.rs
@@ -0,0 +1,16 @@
+// check-fail
+// compile-flags: -Z tiny-const-eval-limit
+
+const fn recurse(n: u32) -> u32 {
+    if n == 0 {
+        n
+    } else {
+        recurse(n - 1) //~ ERROR evaluation of constant value failed [E0080]
+    }
+}
+
+const X: u32 = recurse(19);
+
+fn main() {
+    println!("{X}");
+}
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.stderr b/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.stderr
new file mode 100644
index 000000000..ed9a31119
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-recursion.stderr
@@ -0,0 +1,25 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ctfe-recursion.rs:8:9
+   |
+LL |         recurse(n - 1)
+   |         ^^^^^^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+   |
+note: inside `recurse`
+  --> $DIR/ctfe-recursion.rs:8:9
+   |
+LL |         recurse(n - 1)
+   |         ^^^^^^^^^^^^^^
+note: [... 18 additional calls inside `recurse` ...]
+  --> $DIR/ctfe-recursion.rs:8:9
+   |
+LL |         recurse(n - 1)
+   |         ^^^^^^^^^^^^^^
+note: inside `X`
+  --> $DIR/ctfe-recursion.rs:12:16
+   |
+LL | const X: u32 = recurse(19);
+   |                ^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.rs b/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.rs
new file mode 100644
index 000000000..ca0eec93c
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.rs
@@ -0,0 +1,15 @@
+// check-fail
+// compile-flags: -Z tiny-const-eval-limit
+const fn simple_loop(n: u32) -> u32 {
+    let mut index = 0;
+    while index < n { //~ ERROR evaluation of constant value failed [E0080]
+        index = index + 1;
+    }
+    0
+}
+
+const X: u32 = simple_loop(19);
+
+fn main() {
+    println!("{X}");
+}
diff --git a/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.stderr b/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.stderr
new file mode 100644
index 000000000..83ff275de
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/ctfe-simple-loop.stderr
@@ -0,0 +1,24 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ctfe-simple-loop.rs:5:5
+   |
+LL | /     while index < n {
+LL | |         index = index + 1;
+LL | |     }
+   | |_____^ exceeded interpreter step limit (see `#[const_eval_limit]`)
+   |
+note: inside `simple_loop`
+  --> $DIR/ctfe-simple-loop.rs:5:5
+   |
+LL | /     while index < n {
+LL | |         index = index + 1;
+LL | |     }
+   | |_____^
+note: inside `X`
+  --> $DIR/ctfe-simple-loop.rs:11:16
+   |
+LL | const X: u32 = simple_loop(19);
+   |                ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/const-eval/stable-metric/dominators-edge-case.rs b/tests/ui/consts/const-eval/stable-metric/dominators-edge-case.rs
new file mode 100644
index 000000000..0b0f36180
--- /dev/null
+++ b/tests/ui/consts/const-eval/stable-metric/dominators-edge-case.rs
@@ -0,0 +1,19 @@
+// check-pass
+//
+// Exercising an edge case which was found during Stage 2 compilation.
+// Compilation would fail for this code when running the `CtfeLimit`
+// MirPass (specifically when looking up the dominators).
+#![crate_type="lib"]
+
+const DUMMY: Expr = Expr::Path(ExprPath {
+    attrs: Vec::new(),
+    path: Vec::new(),
+});
+
+pub enum Expr {
+    Path(ExprPath),
+}
+pub struct ExprPath {
+    pub attrs: Vec<()>,
+    pub path: Vec<()>,
+}
diff --git a/tests/ui/consts/const-eval/ub-ref-ptr.stderr b/tests/ui/consts/const-eval/ub-ref-ptr.stderr
index ce618802b..6bd367b64 100644
--- a/tests/ui/consts/const-eval/ub-ref-ptr.stderr
+++ b/tests/ui/consts/const-eval/ub-ref-ptr.stderr
@@ -85,7 +85,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/ub-ref-ptr.rs:43:1
    |
 LL | const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: $SIZE, align: $ALIGN) {
@@ -96,7 +96,7 @@ error[E0080]: it is undefined behavior to use this value
   --> $DIR/ub-ref-ptr.rs:46:1
    |
 LL | const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (address 0x539 is unallocated)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (0x539[noalloc] has no provenance)
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: $SIZE, align: $ALIGN) {
diff --git a/tests/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr b/tests/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr
index 9710bf476..69fb1a59d 100644
--- a/tests/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr
+++ b/tests/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr
@@ -2,10 +2,7 @@ warning: the type `!` does not permit zero-initialization
   --> $DIR/validate_uninhabited_zsts.rs:4:14
    |
 LL |     unsafe { std::mem::transmute(()) }
-   |              ^^^^^^^^^^^^^^^^^^^^^^^
-   |              |
-   |              this code causes undefined behavior when executed
-   |              help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+   |              ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
    |
    = note: the `!` type has no valid value
    = note: `#[warn(invalid_value)]` on by default
@@ -40,10 +37,7 @@ warning: the type `empty::Empty` does not permit zero-initialization
   --> $DIR/validate_uninhabited_zsts.rs:21:42
    |
 LL | const BAR: [empty::Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
-   |                                          ^^^^^^^^^^^^^^^^^^^^^^^
-   |                                          |
-   |                                          this code causes undefined behavior when executed
-   |                                          help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
    |
 note: in this struct field
   --> $DIR/validate_uninhabited_zsts.rs:16:22
diff --git a/tests/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr b/tests/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr
index 9710bf476..69fb1a59d 100644
--- a/tests/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr
+++ b/tests/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr
@@ -2,10 +2,7 @@ warning: the type `!` does not permit zero-initialization
   --> $DIR/validate_uninhabited_zsts.rs:4:14
    |
 LL |     unsafe { std::mem::transmute(()) }
-   |              ^^^^^^^^^^^^^^^^^^^^^^^
-   |              |
-   |              this code causes undefined behavior when executed
-   |              help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+   |              ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
    |
    = note: the `!` type has no valid value
    = note: `#[warn(invalid_value)]` on by default
@@ -40,10 +37,7 @@ warning: the type `empty::Empty` does not permit zero-initialization
   --> $DIR/validate_uninhabited_zsts.rs:21:42
    |
 LL | const BAR: [empty::Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
-   |                                          ^^^^^^^^^^^^^^^^^^^^^^^
-   |                                          |
-   |                                          this code causes undefined behavior when executed
-   |                                          help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
    |
 note: in this struct field
   --> $DIR/validate_uninhabited_zsts.rs:16:22