Fix all hashCodes

Author: ibbem

default.nix

@@ -137,7 +137,7 @@ pkgs.stdenvNoCC.mkDerivation rec {
   checkPhase = ''
     runHook preTest
 
-    mvn --offline -Dmaven.repo.local="$mavenRepo" test
+    MAVEN_OPTS='-XX:+UnlockExperimentalVMOptions -XX:hashCode=2' mvn --offline -Dmaven.repo.local="$mavenRepo" test
 
     runHook postTest
   '';

src/main/java/org/variantsync/diffdetective/variation/diff/construction/GumTreeDiff.java

@@ -97,6 +97,7 @@ public static <B extends VariationNode<B, L>, L extends Label> DiffNode<L> diffU
         }
 
         // We assume that the root nodes are matched.
+        System.out.println("first assertConsistency");
         matching.assertConsistency();
         if (!matching.has(src, dst)) {
             System.out.println("-----------------------------------------------------------");
@@ -118,6 +119,7 @@ public static <B extends VariationNode<B, L>, L extends Label> DiffNode<L> diffU
         for (var mapping : matching) {
             System.out.println(mapping.first + " <-> " + mapping.second);
         }
+        System.out.println("second assertConsistency");
         matching.assertConsistency();
 
         removeUnmapped(matching, src);