use the new feature "panic_handler" to define a panic handler

librs/src/lib.rs

@@ -36,7 +36,6 @@
 #![feature(integer_atomics)]
 #![feature(lang_items)]
 #![feature(linkage)]
-#![feature(panic_implementation)]
 #![feature(panic_info_message)]
 #![feature(specialization)]
 #![allow(unused_macros)]

librs/src/runtime_glue.rs

@@ -30,8 +30,7 @@ use arch;
 use core::panic::PanicInfo;
 
 // see https://users.rust-lang.org/t/psa-breaking-change-panic-fmt-language-item-removed-in-favor-of-panic-implementation/17875
-#[panic_implementation]
-#[no_mangle]
+#[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
 	print!("[{}][!!!PANIC!!!] ", arch::percore::core_id());
 

loader/src/lib.rs

@@ -24,7 +24,6 @@
 #![feature(asm)]
 #![feature(const_fn)]
 #![feature(lang_items)]
-#![feature(panic_implementation)]
 #![feature(panic_info_message)]
 #![feature(specialization)]
 #![no_std]

loader/src/runtime_glue.rs

@@ -29,9 +29,7 @@
 use arch;
 use core::panic::PanicInfo;
 
-// see https://users.rust-lang.org/t/psa-breaking-change-panic-fmt-language-item-removed-in-favor-of-panic-implementation/17875
-#[panic_implementation]
-#[no_mangle]
+#[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
 	loaderlog!("PANIC: ");