Auto merge of #109507 - Amanieu:panic-oom-payload, r=davidtwco

Report allocation errors as panics

OOM is now reported as a panic but with a custom payload type (`AllocErrorPanicPayload`) which holds the layout that was passed to `handle_alloc_error`.

This should be review one commit at a time:
- The first commit adds `AllocErrorPanicPayload` and changes allocation errors to always be reported as panics.
- The second commit removes `#[alloc_error_handler]` and the `alloc_error_hook` API.

ACP: https://github.com/rust-lang/libs-team/issues/192

Closes #51540
Closes #51245

2 files changed, 1 insertions, 13 deletions

diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs
index 7c93c93b4a0..cc3179ee780 100644
--- a/library/core/src/macros/mod.rs
+++ b/library/core/src/macros/mod.rs
@@ -1531,16 +1531,6 @@ pub(crate) mod builtin {
         /* compiler built-in */
     }
 
-    /// Attribute macro applied to a function to register it as a handler for allocation failure.
-    ///
-    /// See also [`std::alloc::handle_alloc_error`](../../../std/alloc/fn.handle_alloc_error.html).
-    #[unstable(feature = "alloc_error_handler", issue = "51540")]
-    #[allow_internal_unstable(rustc_attrs)]
-    #[rustc_builtin_macro]
-    pub macro alloc_error_handler($item:item) {
-        /* compiler built-in */
-    }
-
     /// Keeps the item it's applied to if the passed path is accessible, and removes it otherwise.
     #[unstable(
         feature = "cfg_accessible",
diff --git a/library/core/src/prelude/v1.rs b/library/core/src/prelude/v1.rs
index 10525a16f3a..9c4c0f6ab7a 100644
--- a/library/core/src/prelude/v1.rs
+++ b/library/core/src/prelude/v1.rs
@@ -76,9 +76,7 @@ pub use crate::macros::builtin::{RustcDecodable, RustcEncodable};
 // Do not `doc(no_inline)` so that they become doc items on their own
 // (no public module for them to be re-exported from).
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
-pub use crate::macros::builtin::{
-    alloc_error_handler, bench, derive, global_allocator, test, test_case,
-};
+pub use crate::macros::builtin::{bench, derive, global_allocator, test, test_case};
 
 #[unstable(feature = "derive_const", issue = "none")]
 pub use crate::macros::builtin::derive_const;