Program: 84579
Project: 84579
Buggy source:
@Override public IValue withType(IType type,ITypeContext typeContext,MarkerList markers,IContext context){
  if (!this.isType(type)) {
    return null;
  }
  this.type=type;
  this.method=type.getFunctionalMethod();
  if (this.method != null) {
    if (this.method.hasTypeVariables()) {
      for (int i=0; i < this.parameterCount; i++) {
        IParameter param=this.parameters[i];
        IType parType=param.getType();
        if (parType == null) {
          parType=this.method.getParameter(i).getType();
        }
        param.setType(parType.getConcreteType(this.type));
      }
      this.returnType=this.method.getType().getConcreteType(this.type);
    }
 else {
      for (int i=0; i < this.parameterCount; i++) {
        IParameter param=this.parameters[i];
        if (param.getType() == null) {
          param.setType(this.method.getParameter(i).getType());
        }
      }
      this.returnType=this.method.getType();
    }
    this.context=context;
    this.value=this.value.resolve(markers,this);
    boolean inferReturn=false;
    if (this.returnType == Types.UNKNOWN) {
      inferReturn=true;
      this.returnType=this.value.getType().getReferenceType();
    }
    IValue value1=this.value.withType(this.returnType,typeContext,markers,this);
    if (value1 == null) {
      Marker marker=markers.create(this.value.getPosition(),"String_Node_Str");
      marker.addInfo("String_Node_Str" + this.returnType);
      marker.addInfo("String_Node_Str" + this.value.getType());
    }
 else {
      this.value=value1;
      if (inferReturn) {
        this.returnType=this.value.getType();
      }
    }
    this.context=null;
    ITypeContext tempContext=new MapTypeContext();
    this.method.getType().inferTypes(this.returnType,tempContext);
    IType type1=this.method.getTheClass().getType().getConcreteType(tempContext);
    type.inferTypes(type1,typeContext);
  }
  if (this.type.typeTag() == IType.LAMBDA) {
    this.type=null;
    this.type=this.getType();
  }
 else {
    this.type=type.getConcreteType(typeContext);
  }
  return this;
}

Fixed version (ground truth):
@Override public IValue withType(IType type,ITypeContext typeContext,MarkerList markers,IContext context){
  if (!this.isType(type)) {
    return null;
  }
  this.type=type;
  this.method=type.getFunctionalMethod();
  if (this.method != null) {
    if (this.method.hasTypeVariables()) {
      for (int i=0; i < this.parameterCount; i++) {
        IParameter param=this.parameters[i];
        IType parType=param.getType();
        if (parType == null) {
          parType=this.method.getParameter(i).getType().getConcreteType(this.type).getParameterType();
          param.setType(parType);
        }
      }
      this.returnType=this.method.getType().getConcreteType(this.type).getReturnType();
    }
 else {
      for (int i=0; i < this.parameterCount; i++) {
        IParameter param=this.parameters[i];
        if (param.getType() == null) {
          param.setType(this.method.getParameter(i).getType());
        }
      }
      this.returnType=this.method.getType();
    }
    this.context=context;
    this.value=this.value.resolve(markers,this);
    IType valueType=this.value.getType().getReferenceType();
    IValue value1=this.value.withType(this.returnType,typeContext,markers,this);
    if (value1 == null) {
      Marker marker=markers.create(this.value.getPosition(),"String_Node_Str");
      marker.addInfo("String_Node_Str" + this.returnType);
      marker.addInfo("String_Node_Str" + this.value.getType());
    }
 else {
      this.value=value1;
      valueType=this.value.getType();
    }
    this.context=null;
    ITypeContext tempContext=new MapTypeContext();
    this.method.getType().inferTypes(valueType,tempContext);
    IType type1=this.method.getTheClass().getType().getConcreteType(tempContext);
    type.inferTypes(type1,typeContext);
  }
  if (this.type.typeTag() == IType.LAMBDA) {
    this.type=null;
    this.type=this.getType();
  }
 else {
    this.type=type.getConcreteType(typeContext);
  }
  return this;
}