Add the rustc:: lint prefix

Author: saethlin

library/alloc/src/alloc.rs

@@ -419,7 +419,7 @@ pub mod __alloc_error_handler {
     // called via generated `__rust_alloc_error_handler` if there is no
     // `#[alloc_error_handler]`.
     #[rustc_std_internal_symbol]
-    #[allow(missing_panic_entrypoint)]
+    #[allow(rustc::missing_panic_entrypoint)]
     pub unsafe fn __rdl_alloc_error_handler(size: usize, _align: usize) -> ! {
         core::panicking::panic_nounwind_fmt(
             format_args!("memory allocation of {size} bytes failed"),

library/alloc/src/lib.rs

@@ -82,7 +82,7 @@
 #![warn(rustdoc::unescaped_backticks)]
 #![deny(ffi_unwind_calls)]
 #![warn(unreachable_pub)]
-#![warn(missing_panic_entrypoint)]
+#![warn(rustc::missing_panic_entrypoint)]
 //
 // Library features:
 // tidy-alphabetical-start

library/core/src/lib.rs

@@ -88,7 +88,7 @@
 #![warn(multiple_supertrait_upcastable)]
 #![allow(internal_features)]
 #![deny(ffi_unwind_calls)]
-#![warn(missing_panic_entrypoint)]
+#![warn(rustc::missing_panic_entrypoint)]
 #![warn(unreachable_pub)]
 // Do not check link redundancy on bootstrapping phase
 #![allow(rustdoc::redundant_explicit_links)]

library/core/src/panicking.rs

@@ -372,7 +372,7 @@ pub fn assert_matches_failed<T: fmt::Debug + ?Sized>(
 
 /// Non-generic version of the above functions, to avoid code bloat.
 #[track_caller]
-#[allow(missing_panic_entrypoint)]
+#[rustc_panic_entrypoint]
 fn assert_failed_inner(
     kind: AssertKind,
     left: &dyn fmt::Debug,