Merging upstream version 1.70.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 6 insertions, 10 deletions

diff --git a/library/std/src/panicking.rs b/library/std/src/panicking.rs
index e59f32af7..a46a29cba 100644
--- a/library/std/src/panicking.rs
+++ b/library/std/src/panicking.rs
@@ -46,12 +46,10 @@ extern "C" {
     fn __rust_panic_cleanup(payload: *mut u8) -> *mut (dyn Any + Send + 'static);
 }
 
-#[allow(improper_ctypes)]
 extern "Rust" {
-    /// `payload` is passed through another layer of raw pointers as `&mut dyn Trait` is not
-    /// FFI-safe. `BoxMeUp` lazily performs allocation only when needed (this avoids allocations
-    /// when using the "abort" panic runtime).
-    fn __rust_start_panic(payload: *mut &mut dyn BoxMeUp) -> u32;
+    /// `BoxMeUp` lazily performs allocation only when needed (this avoids
+    /// allocations when using the "abort" panic runtime).
+    fn __rust_start_panic(payload: &mut dyn BoxMeUp) -> u32;
 }
 
 /// This function is called by the panic runtime if FFI code catches a Rust
@@ -500,6 +498,7 @@ pub unsafe fn r#try<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<dyn Any + Send>>
     // This function cannot be marked as `unsafe` because `intrinsics::r#try`
     // expects normal function pointers.
     #[inline]
+    #[rustc_nounwind] // `intrinsic::r#try` requires catch fn to be nounwind
     fn do_catch<F: FnOnce() -> R, R>(data: *mut u8, payload: *mut u8) {
         // SAFETY: this is the responsibility of the caller, see above.
         //
@@ -738,10 +737,7 @@ pub fn rust_panic_without_hook(payload: Box<dyn Any + Send>) -> ! {
 /// yer breakpoints.
 #[inline(never)]
 #[cfg_attr(not(test), rustc_std_internal_symbol)]
-fn rust_panic(mut msg: &mut dyn BoxMeUp) -> ! {
-    let code = unsafe {
-        let obj = &mut msg as *mut &mut dyn BoxMeUp;
-        __rust_start_panic(obj)
-    };
+fn rust_panic(msg: &mut dyn BoxMeUp) -> ! {
+    let code = unsafe { __rust_start_panic(msg) };
     rtabort!("failed to initiate panic, error {code}")
 }