Program: 84033
Project: 84033
Buggy source:
@Override public void check(List<Marker> markers,IContext context){
  if ((this.modifiers & Modifiers.STATIC) == 0) {
    if (this.overrideMethod == null) {
      if ((this.modifiers & Modifiers.OVERRIDE) != 0) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
    }
 else     if (!this.isConstructor) {
      if ((this.modifiers & Modifiers.OVERRIDE) == 0) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
 else       if (this.overrideMethod.hasModifier(Modifiers.FINAL)) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
 else {
        IType type=this.overrideMethod.getType();
        if (!Type.isSuperType(type,this.type)) {
          SemanticError error=new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str");
          error.addInfo("String_Node_Str" + this.type);
          error.addInfo("String_Node_Str" + type);
          markers.add(error);
        }
      }
    }
  }
  for (  Annotation a : this.annotations) {
    a.check(markers,context);
  }
  for (  Parameter p : this.parameters) {
    p.check(markers,context);
  }
  for (  Variable v : this.variables) {
    v.check(markers,context);
  }
  if (this.statement != null) {
    if (this.isConstructor) {
      if (!this.statement.requireType(Type.VOID)) {
        SemanticError error=new SemanticError(this.position,"String_Node_Str");
        error.addInfo("String_Node_Str" + this.statement.getType());
        markers.add(error);
      }
    }
 else     if (!this.statement.requireType(this.type)) {
      SemanticError error=new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str");
      error.addInfo("String_Node_Str" + this.type);
      error.addInfo("String_Node_Str" + this.statement.getType());
      markers.add(error);
    }
    this.statement.check(markers,context);
  }
 else   if (this.isStatic()) {
    markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
  }
 else   if ((this.modifiers & Modifiers.ABSTRACT) == 0) {
    if (this.theClass.isAbstract()) {
      this.modifiers|=Modifiers.ABSTRACT;
    }
 else {
      markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
    }
  }
}

Fixed version (ground truth):
@Override public void check(List<Marker> markers,IContext context){
  if ((this.modifiers & Modifiers.STATIC) == 0) {
    if (this.overrideMethod == null) {
      if ((this.modifiers & Modifiers.OVERRIDE) != 0) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
    }
 else     if (!this.isConstructor) {
      if ((this.modifiers & Modifiers.OVERRIDE) == 0) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
 else       if (this.overrideMethod.hasModifier(Modifiers.FINAL)) {
        markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
      }
 else {
        IType type=this.overrideMethod.getType();
        if (!Type.isSuperType(type,this.type)) {
          SemanticError error=new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str");
          error.addInfo("String_Node_Str" + this.type);
          error.addInfo("String_Node_Str" + type);
          markers.add(error);
        }
      }
    }
  }
  for (  Annotation a : this.annotations) {
    a.check(markers,context);
  }
  for (  Parameter p : this.parameters) {
    p.check(markers,context);
  }
  if (this.statement != null) {
    if (this.isConstructor) {
      if (!this.statement.requireType(Type.VOID)) {
        SemanticError error=new SemanticError(this.position,"String_Node_Str");
        error.addInfo("String_Node_Str" + this.statement.getType());
        markers.add(error);
      }
    }
 else     if (!this.statement.requireType(this.type)) {
      SemanticError error=new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str");
      error.addInfo("String_Node_Str" + this.type);
      error.addInfo("String_Node_Str" + this.statement.getType());
      markers.add(error);
    }
    this.statement.check(markers,context);
  }
 else   if (this.isStatic()) {
    markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
  }
 else   if ((this.modifiers & Modifiers.ABSTRACT) == 0) {
    if (this.theClass.isAbstract()) {
      this.modifiers|=Modifiers.ABSTRACT;
    }
 else {
      markers.add(new SemanticError(this.position,"String_Node_Str" + this.name + "String_Node_Str"));
    }
  }
}