gistfile1.java

interface ItemType
{
  int getMaxDamage();
}

class net.minecraft.src.Item
{
  ...
  
  int getMaxDamage() //becomes func_24925_a
  {
    return this.maxDamage;
  }
  
  ...
}

@Mixin(Item.class)
@Implements(@Interface(iface = ItemType.class, prefix = "sp$"))
abstract class MixinItemType
{
  @Shadow
  public abstract int getMaxDamage();
  
  public int sp$getMaxDamage()
  {
    return getMaxDamage();
  }
  
}