Add a print_error function, which works for exceptions inside println

src/vga_buffer.rs

@@ -38,6 +38,19 @@ pub fn clear_screen() {
     }
 }
 
+pub unsafe fn print_error(fmt: fmt::Arguments) {
+    use core::fmt::Write;
+
+    let mut writer = Writer {
+        column_position: 0,
+        color_code: ColorCode::new(Color::Red, Color::Black),
+        buffer: Unique::new(0xb8000 as *mut _),
+    };
+    writer.new_line();
+    writer.write_fmt(fmt);
+}
+
+
 #[allow(dead_code)]
 #[repr(u8)]
 pub enum Color {