Marker exhaustion & auto-removal in invalid positions

src/main/java/com/volmit/iris/util/function/Consumer4.java

@@ -18,6 +18,8 @@
 
 package com.volmit.iris.util.function;
 
+import java.util.concurrent.ExecutionException;
+
 @FunctionalInterface
 public interface Consumer4<A, B, C, D> {
     void accept(A a, B b, C c, D d);