Auto merge of #52014 - pietroalbini:rollup, r=pietroalbini

Rollup of 13 pull requests

Successful merges:

 - #51548 (Initialize LLVM's AMDGPU target machine, if available.)
 - #51809 (Add read_exact_at and write_all_at methods to FileExt on unix)
 - #51914 (add outlives annotations to `BTreeMap`)
 - #51958 (Show known meta items in unknown meta items error)
 - #51973 (Make Stdio handle UnwindSafe)
 - #51977 (bootstrap: tests should use rustc from config.toml)
 - #51978 (Do not suggest changes to str literal if it isn't one)
 - #51979 (Get rid of `TyImplTraitExistential`)
 - #51980 (Emit column info in debuginfo for non msvc like targets)
 - #51982 (incr.comp.: Take names of children into account when computing the ICH of a module's HIR.)
 - #51997 (add entry for cargo-metadata feature to RELEASES)
 - #52004 (toolstate: Fixed detection of changed submodule, and other fixes.)
 - #52006 ( Change --keep-stage to apply more often)

Failed merges:

r? @ghost

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libstd/sys_common/remutex.rs b/src/libstd/sys_common/remutex.rs
index 022056f8a8a..071a3a25c7a 100644
--- a/src/libstd/sys_common/remutex.rs
+++ b/src/libstd/sys_common/remutex.rs
@@ -13,6 +13,7 @@ use marker;
 use ops::Deref;
 use sys_common::poison::{self, TryLockError, TryLockResult, LockResult};
 use sys::mutex as sys;
+use panic::{UnwindSafe, RefUnwindSafe};
 
 /// A re-entrant mutual exclusion
 ///
@@ -28,6 +29,9 @@ pub struct ReentrantMutex<T> {
 unsafe impl<T: Send> Send for ReentrantMutex<T> {}
 unsafe impl<T: Send> Sync for ReentrantMutex<T> {}
 
+impl<T> UnwindSafe for ReentrantMutex<T> {}
+impl<T> RefUnwindSafe for ReentrantMutex<T> {}
+
 
 /// An RAII implementation of a "scoped lock" of a mutex. When this structure is
 /// dropped (falls out of scope), the lock will be unlocked.