Adapted panic message to the new stabilized PanicInfo::message me…

…thod.

This commit removed unneccessary/depricated code paths as well as adapts the panic handler to use the newly stabilized ``PanicInfo::message``

src/lib.rs

@@ -1,7 +1,6 @@
 #![no_std]
 #![feature(start)]
 #![feature(const_fn_floating_point_arithmetic)]
-#![feature(panic_info_message)]
 
 use alloc::fmt;
 use alloc::vec::Vec;

src/panic.rs

@@ -31,14 +31,9 @@ fn panic(info: &core::panic::PanicInfo) -> ! {
             None => ("(unknown file)", 0),
         };
 
-        if let Some(m) = info.message() {
-            let _ = write!(ConsoleWriter, "PANIC: {m}\n at {file}:{line}");
-        } else if let Some(m) = info.payload().downcast_ref::<&str>() {
-            let _ = write!(ConsoleWriter, "PANIC: {m}\n at {file}:{line}");
-        } else {
-            let _ = write!(ConsoleWriter, "PANIC: (no message)\n at {file}:{line}");
-        }
+        let message = info.message();
+
+        let _ = write!(ConsoleWriter, "PANIC: {message}\n at {file}:{line}");
     }
-
     loop {}
 }