Build is broken due to panic_fmt being broken about discovery HOT 7 CLOSED

diff --git a/src/16-punch-o-meter/auxiliary/src/lib.rs b/src/16-punch-o-meter/auxiliary/src/lib.rs
index 5484cd7..e268ec8 100644
--- a/src/16-punch-o-meter/auxiliary/src/lib.rs
+++ b/src/16-punch-o-meter/auxiliary/src/lib.rs
@@ -2,6 +2,7 @@
 
 #![feature(lang_items)]
 #![feature(use_extern_macros)]
+#![feature(panic_implementation)]
 #![no_std]
 
 extern crate cortex_m;
@@ -49,20 +50,17 @@ pub fn init() -> (Lsm303dlhc, Delay, MonoTimer, ITM) {
     (lsm303dlhc, delay, mono_timer, cp.ITM)
 }
 
-#[lang = "panic_fmt"]
-unsafe extern "C" fn panic_fmt(
-    args: ::core::fmt::Arguments,
-    file: &'static str,
-    line: u32,
-    col: u32,
-) -> ! {
-    let itm = &mut *ITM::ptr();
-
-    itm::write_str(&mut itm.stim[0], "PANIC at '");
-    itm::write_fmt(&mut itm.stim[0], args);
-    iprintln!(&mut itm.stim[0], "', {}:{}:{}", file, line, col);
-
+use core::panic::PanicInfo;
+#[panic_implementation]
+fn panic(_info: &PanicInfo) -> ! {
+    unsafe {
+        let itm = &mut *ITM::ptr();
+
+        let location = _info.location().unwrap();
+        itm::write_str(&mut itm.stim[0], "PANIC at '");
+        itm::write_str(&mut itm.stim[0], _info.payload().downcast_ref::<&str>().unwrap());
+        iprintln!(&mut itm.stim[0], "', {}:{}:{}", location.file(), location.line(), location.column());
+    }
     cortex_m::asm::bkpt();
-
     loop {}
 }