Auto merge of #69118 - Dylan-DPC:rollup-7hpm1fj, r=Dylan-DPC

Rollup of 9 pull requests

Successful merges:

 - #67642 (Relax bounds on HashMap/HashSet)
 - #68848 (Hasten macro parsing)
 - #69008 (Properly use parent generics for opaque types)
 - #69048 (Suggestion when encountering assoc types from hrtb)
 - #69049 (Optimize image sizes)
 - #69050 (Micro-optimize the heck out of LEB128 reading and writing.)
 - #69068 (Make the SGX arg cleanup implementation a NOP)
 - #69082 (When expecting `BoxFuture` and using `async {}`, suggest `Box::pin`)
 - #69104 (bootstrap: Configure cmake when building sanitizer runtimes)

Failed merges:

r? @ghost

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libcore/marker.rs b/src/libcore/marker.rs
index b4b595f330e..2800f11cc01 100644
--- a/src/libcore/marker.rs
+++ b/src/libcore/marker.rs
@@ -727,6 +727,10 @@ unsafe impl<T: ?Sized> Freeze for &mut T {}
 /// [`Pin<P>`]: ../pin/struct.Pin.html
 /// [`pin module`]: ../../std/pin/index.html
 #[stable(feature = "pin", since = "1.33.0")]
+#[rustc_on_unimplemented(
+    on(_Self = "std::future::Future", note = "consider using `Box::pin`",),
+    message = "`{Self}` cannot be unpinned"
+)]
 #[lang = "unpin"]
 pub auto trait Unpin {}