message: Print a message when panicking from mini_core
diff: @@ -268,6 +268,7 @@ pub trait FnMut<Args>: FnOnce<Args> {
  #[lang = "panic"]
  pub fn panic(&(_msg, _file, _line, _col): &(&'static str, &'static str, u32, u32)) -> ! {
  unsafe {
  + libc::puts("Panicking\0" as *const str as *const u8);
  intrinsics::abort();
  }
  }
  