temporary patch to work around UB in a test

Author: RalfJung

rust-src.diff

@@ -0,0 +1,24 @@
+diff --git a/library/alloc/tests/arc.rs b/library/alloc/tests/arc.rs
+index eb379e4d6a1..9191fa95150 100644
+--- a/library/alloc/tests/arc.rs
++++ b/library/alloc/tests/arc.rs
+@@ -212,6 +212,7 @@ fn hmm<'a>(val: &'a mut Weak<&'a str>) -> Weak<&'a str> {
+ }
+ 
+ #[test]
++#[cfg_attr(miri, ignore)] // test has UB (https://github.com/rust-lang/rust/issues/104565)
+ fn arc_from_vec_opt() {
+     let mut v = Vec::with_capacity(64);
+     v.push(0usize);
+diff --git a/library/alloc/tests/rc.rs b/library/alloc/tests/rc.rs
+index 1d5f3c52006..0a19162a402 100644
+--- a/library/alloc/tests/rc.rs
++++ b/library/alloc/tests/rc.rs
+@@ -208,6 +208,7 @@ fn hmm<'a>(val: &'a mut Weak<&'a str>) -> Weak<&'a str> {
+ }
+ 
+ #[test]
++#[cfg_attr(miri, ignore)] // test has UB (https://github.com/rust-lang/rust/issues/104565)
+ fn rc_from_vec_opt() {
+     let mut v = Vec::with_capacity(64);
+     v.push(0usize);

rust-version

@@ -1 +1 @@
-nightly-2022-11-17
+nightly-2022-11-19