anchor.diff:          default = false;
           type = types.bool;
           description = ''
  -          Make Memtest86+, a memory testing program, available from the
  -          GRUB boot menu.
  +          Make Memtest86+ (or MemTest86 if EFI support is enabled),
  +          a memory testing program, available from the
  +          GRUB boot menu. MemTest86 is an unfree program, so
  +          this requires <literal>allowUnfree</literal> to be set to
  +          <literal>true</literal>.
           '';
         };
   
  
positive.code: 
  let
    memtest86 = pkgs.memtest86plus;
    cfg = config.boot.loader.grub.memtest86;
  in
  
  
negative.code: # This module adds Memtest86+/Memtest86 to the GRUB boot menu.
  
  { config, lib, pkgs, ... }:
  
  