implement empty visitors

src/main/java/de/hsrm/compiler/Klang/visitors/EvalVisitor.java

@@ -484,4 +484,10 @@ public class EvalVisitor implements Visitor<Value> {
     return null;
   }
 
+  @Override
+  public Value visit(StructFieldAccessExpression e) {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
 }

src/main/java/de/hsrm/compiler/Klang/visitors/GenASM.java

@@ -807,4 +807,10 @@ public class GenASM implements Visitor<Void> {
     return null;
   }
 
+  @Override
+  public Void visit(StructFieldAccessExpression e) {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
 }

src/main/java/de/hsrm/compiler/Klang/visitors/GetVars.java

@@ -250,4 +250,9 @@ class GetVars implements Visitor<Void> {
     return null;
   }
 
+  @Override
+  public Void visit(StructFieldAccessExpression e) {
+    return null;
+  }
+
 }

src/main/java/de/hsrm/compiler/Klang/visitors/PrettyPrintVisitor.java

@@ -62,7 +62,7 @@ public class PrettyPrintVisitor implements Visitor<Void> {
       ex.nl();
     }
 
-    for (var structDef: e.structs) {
+    for (var structDef: e.structs.values()) {
       structDef.welcome(this);
       ex.nl();
       ex.nl();
@@ -405,4 +405,10 @@ public class PrettyPrintVisitor implements Visitor<Void> {
     return null;
   }
 
+  @Override
+  public Void visit(StructFieldAccessExpression e) {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
 }

src/main/java/de/hsrm/compiler/Klang/visitors/Visitor.java

@@ -45,4 +45,5 @@ public interface Visitor<R> {
     R visit(Parameter e);
     R visit(StructDefinition e);
     R visit(StructField e);
+    R visit(StructFieldAccessExpression e);
 }