Auto merge of #61201 - Centril:rollup-975knrk, r=Centril

Rollup of 9 pull requests

Successful merges:

 - #61087 (Tweak `self` arg not as first argument of a method diagnostic)
 - #61114 (Vec: avoid creating slices to the elements)
 - #61144 (Suggest borrowing for loop head on move error)
 - #61149 (Fix spelling in release notes)
 - #61161 (MaybeUninit doctest: remove unnecessary type ascription)
 - #61173 (Auto-derive Encode and Decode implementations of DefPathTable)
 - #61184 (Add additional trace statements to the const propagator)
 - #61189 (Turn turbo 🐟 🍨 into an error)
 - #61193 (Add comment to explain why we change the layout for Projection)

Failed merges:

r? @ghost

1 files changed, 21 insertions, 0 deletions

diff --git a/src/liballoc/tests/vec.rs b/src/liballoc/tests/vec.rs
index 3307bdf94f9..5ddac673c9f 100644
--- a/src/liballoc/tests/vec.rs
+++ b/src/liballoc/tests/vec.rs
@@ -1152,3 +1152,24 @@ fn test_try_reserve_exact() {
     }
 
 }
+
+#[test]
+fn test_stable_push_pop() {
+    // Test that, if we reserved enough space, adding and removing elements does not
+    // invalidate references into the vector (such as `v0`).  This test also
+    // runs in Miri, which would detect such problems.
+    let mut v = Vec::with_capacity(10);
+    v.push(13);
+
+    // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
+    let v0 = unsafe { &*(&v[0] as *const _) };
+
+    // Now do a bunch of things and occasionally use `v0` again to assert it is still valid.
+    v.push(1);
+    v.push(2);
+    v.insert(1, 1);
+    assert_eq!(*v0, 13);
+    v.remove(1);
+    v.pop().unwrap();
+    assert_eq!(*v0, 13);
+}