ColorCode::new does not need to be a const fn

src/main.rs

@@ -1,5 +1,4 @@
 #![feature(lang_items)] // required for defining the panic handler
-#![feature(const_fn)] // allow declaring functions as const
 #![no_std] // don't link the Rust standard library
 #![cfg_attr(not(test), no_main)] // disable all Rust-level entry points
 #![cfg_attr(test, allow(dead_code, unused_macros))] // allow unused code in test mode

src/vga_buffer.rs

@@ -42,7 +42,7 @@ struct ColorCode(u8);
 
 impl ColorCode {
     /// Create a new `ColorCode` with the given foreground and background colors.
-    const fn new(foreground: Color, background: Color) -> ColorCode {
+    fn new(foreground: Color, background: Color) -> ColorCode {
         ColorCode((background as u8) << 4 | (foreground as u8))
     }
 }