From cbc9e112bdf0cb1437520e6d0267c5b7de5f0fc8 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Thu, 13 Apr 2017 17:53:34 +0200
Subject: [PATCH] Print a proper message on panics

---
 src/lib.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index a30dd50..433b051 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,4 +31,11 @@ pub extern fn rust_main(multiboot_information_address: usize) {
 }
 
 #[lang = "eh_personality"] extern fn eh_personality() {}
-#[lang = "panic_fmt"] #[no_mangle] pub extern fn panic_fmt() -> ! {loop{}}
+
+#[lang = "panic_fmt"]
+#[no_mangle]
+pub extern fn panic_fmt(fmt: core::fmt::Arguments, file: &'static str, line: u32) -> ! {
+    println!("\n\nPANIC in {} at line {}:", file, line);
+    println!("    {}", fmt);
+    loop{}
+}