adjust old test

src/test/ui/packed/packed-struct-borrow-element-64bit.rs

+// run-pass (note: this is spec-UB, but it works for now)
+// ignore-32bit (needs `usize` to be 8-aligned to reproduce all the errors below)
+#![allow(dead_code)]
+// ignore-emscripten weird assertion?
+
+#[repr(C, packed(4))]
+struct Foo4C {
+    bar: u8,
+    baz: usize
+}
+
+pub fn main() {
+    let foo = Foo4C { bar: 1, baz: 2 };
+    let brw = &foo.baz; //~WARN reference to packed field is unaligned
+    //~^ previously accepted
+    assert_eq!(*brw, 2);
+}

src/test/ui/packed/packed-struct-borrow-element-64bit.stderr

+warning: reference to packed field is unaligned
+  --> $DIR/packed-struct-borrow-element-64bit.rs:14:15
+   |
+LL |     let brw = &foo.baz;
+   |               ^^^^^^^^
+   |
+   = note: `#[warn(unaligned_references)]` on by default
+   = 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 #82523 <https://github.com/rust-lang/rust/issues/82523>
+   = note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+
+warning: 1 warning emitted
+

src/test/ui/packed/packed-struct-borrow-element.rs

@@ -30,9 +30,4 @@ pub fn main() {
     let brw = &foo.baz; //~WARN reference to packed field is unaligned
     //~^ previously accepted
     assert_eq!(*brw, 2);
-
-    let foo = Foo4C { bar: 1, baz: 2 };
-    let brw = &foo.baz; //~WARN reference to packed field is unaligned
-    //~^ previously accepted
-    assert_eq!(*brw, 2);
 }

src/test/ui/packed/packed-struct-borrow-element.stderr

@@ -19,15 +19,5 @@ LL |     let brw = &foo.baz;
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
    = note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
 
-warning: reference to packed field is unaligned
-  --> $DIR/packed-struct-borrow-element.rs:35:15
-   |
-LL |     let brw = &foo.baz;
-   |               ^^^^^^^^
-   |
-   = 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 #82523 <https://github.com/rust-lang/rust/issues/82523>
-   = note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
-
-warning: 3 warnings emitted
+warning: 2 warnings emitted