diff --git a/src/main/java/de/dhbwstuttgart/syntaxtree/statement/Block.java b/src/main/java/de/dhbwstuttgart/syntaxtree/statement/Block.java
index bc35364b..3cbcea38 100644
--- a/src/main/java/de/dhbwstuttgart/syntaxtree/statement/Block.java
+++ b/src/main/java/de/dhbwstuttgart/syntaxtree/statement/Block.java
@@ -1,12 +1,12 @@
 package de.dhbwstuttgart.syntaxtree.statement;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.antlr.v4.runtime.Token;
 
 import de.dhbwstuttgart.syntaxtree.StatementVisitor;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
-import de.dhbwstuttgart.typeinference.assumptions.TypeInferenceBlockInformation;
-import de.dhbwstuttgart.typeinference.constraints.ConstraintSet;
-import org.antlr.v4.runtime.Token;
 
 public class Block extends Statement {
     public Block(List<Statement> statements, Token offset) {
diff --git a/src/main/java/de/dhbwstuttgart/syntaxtree/statement/InstanceOf.java b/src/main/java/de/dhbwstuttgart/syntaxtree/statement/InstanceOf.java
index 7b9e0555..55d5e6da 100644
--- a/src/main/java/de/dhbwstuttgart/syntaxtree/statement/InstanceOf.java
+++ b/src/main/java/de/dhbwstuttgart/syntaxtree/statement/InstanceOf.java
@@ -7,26 +7,28 @@ import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
 
 public class InstanceOf extends BinaryExpr {
-    private RefTypeOrTPHOrWildcardOrGeneric reftype;
-    private String name = null;
+    private Pattern pattern;
 
     public InstanceOf(Expression expr, RefTypeOrTPHOrWildcardOrGeneric reftype, Token offset) {
         super(BinaryExpr.Operator.INSTOF, TypePlaceholder.fresh(offset), expr, new LocalVar("", reftype, reftype.getOffset()), offset);
-        this.reftype = reftype;
+        this.pattern = new Pattern(null, reftype, offset);
     }
 
     public InstanceOf(Expression expr, Pattern pattern, Token offset) {
         super(BinaryExpr.Operator.INSTOF, TypePlaceholder.fresh(offset), expr, new LocalVar(pattern.getName(), pattern.getType(), pattern.getOffset()), offset);
-        this.reftype = pattern.getType();
-        this.name = pattern.getName();
+        this.pattern = pattern;
     }
 
     public RefTypeOrTPHOrWildcardOrGeneric getReftype() {
-        return reftype;
+        return pattern.getType();
     }
 
     public String getName() {
-        return name;
+        return pattern.getName();
+    }
+
+    public Pattern gPattern() {
+        return pattern;
     }
 
     @Override
diff --git a/src/test/java/syntaxtreegenerator/TestComplete.java b/src/test/java/syntaxtreegenerator/TestComplete.java
index e60f01d8..9d538415 100644
--- a/src/test/java/syntaxtreegenerator/TestComplete.java
+++ b/src/test/java/syntaxtreegenerator/TestComplete.java
@@ -7,6 +7,9 @@ import static org.junit.Assert.fail;
 import java.io.File;
 import java.io.FileFilter;
 import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
 import java.util.HashMap;
 
 import org.junit.BeforeClass;
@@ -14,6 +17,7 @@ import org.junit.Test;
 
 import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.exceptions.NotImplementedException;
+import de.dhbwstuttgart.syntaxtree.SourceFile;
 import de.dhbwstuttgart.syntaxtree.visual.ASTPrinter;
 
 /**