Program: 187971
Project: 187971
Buggy source:
/** 
 * Import the pony from file
 * @return  The pony
 */
public Pony importCow(){
  InputStream in=System.in;
  if (this.file != null)   in=new BufferedInputStream(new FileInputStream(this.file));
  Scanner sc=new Scanner(in,"String_Node_Str");
  StringBuilder cow=new StringBuilder();
  StringBuilder data=new StringBuilder();
  boolean meta=false;
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  while (sc.hasNextLine()) {
    String line=sc.nextLine();
    if (line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").startsWith("String_Node_Str")) {
      if (meta == false) {
        meta=true;
        data.append("String_Node_Str");
      }
      line=line.substring(line.indexOf("String_Node_Str") + 1);
      if (line.equals("String_Node_Str"))       line="String_Node_Str";
      data.append(line + "String_Node_Str");
      data.append('\n');
    }
 else {
      cow.append(line.replace("String_Node_Str","String_Node_Str"));
      cow.append('\n');
    }
  }
  if (meta)   data.append("String_Node_Str");
  cow.append("String_Node_Str");
  if (in != System.in)   in.close();
  String pony=new String(execCow(cow.toString()),"String_Node_Str");
  String line=pony.substring(0,pony.indexOf('\n'));
  int pos=line.indexOf("String_Node_Str") + 3;
  if (pos > 3)   data.append("String_Node_Str" + pos + "String_Node_Str");
 else   data.append("String_Node_Str");
  data.append(pony);
  InputStream stdin=System.in;
  try {
    final byte[] streamdata=data.toString().getBytes("String_Node_Str");
    System.setIn(new InputStream(){
      int ptr=0;
      @Override public int read(){
        if (this.ptr == streamdata.length)         return -1;
        return streamdata[this.ptr++] & 255;
      }
      @Override public int available(){
        return streamdata.length - this.ptr;
      }
    }
);
    this.flags.put("String_Node_Str",null);
    Ponysay ponysay=new Ponysay(this.flags);
    if (ponysay.version == this.version)     throw new Error("String_Node_Str");
    return ponysay.importPony();
  }
  finally {
    System.setIn(stdin);
  }
}

Fixed version (ground truth):
/** 
 * Import the pony from file
 * @return  The pony
 * @throws IOException  On I/O error
 */
public Pony importCow() throws IOException {
  InputStream in=System.in;
  if (this.file != null)   in=new BufferedInputStream(new FileInputStream(this.file));
  Scanner sc=new Scanner(in,"String_Node_Str");
  StringBuilder cow=new StringBuilder();
  StringBuilder data=new StringBuilder();
  boolean meta=false;
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  cow.append("String_Node_Str");
  while (sc.hasNextLine()) {
    String line=sc.nextLine();
    if (line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").startsWith("String_Node_Str")) {
      if (meta == false) {
        meta=true;
        data.append("String_Node_Str");
      }
      line=line.substring(line.indexOf("String_Node_Str") + 1);
      if (line.equals("String_Node_Str"))       line="String_Node_Str";
      data.append(line + "String_Node_Str");
      data.append('\n');
    }
 else {
      cow.append(line.replace("String_Node_Str","String_Node_Str"));
      cow.append('\n');
    }
  }
  if (meta)   data.append("String_Node_Str");
  cow.append("String_Node_Str");
  if (in != System.in)   in.close();
  String pony=new String(execCow(cow.toString()),"String_Node_Str");
  String line=pony.substring(0,pony.indexOf('\n'));
  int pos=line.indexOf("String_Node_Str") + 3;
  if (pos > 3)   data.append("String_Node_Str" + pos + "String_Node_Str");
 else   data.append("String_Node_Str");
  data.append(pony);
  InputStream stdin=System.in;
  try {
    final byte[] streamdata=data.toString().getBytes("String_Node_Str");
    System.setIn(new InputStream(){
      int ptr=0;
      @Override public int read(){
        if (this.ptr == streamdata.length)         return -1;
        return streamdata[this.ptr++] & 255;
      }
      @Override public int available(){
        return streamdata.length - this.ptr;
      }
    }
);
    this.flags.put("String_Node_Str",null);
    Ponysay ponysay=new Ponysay(this.flags);
    if (ponysay.version == this.version)     throw new Error("String_Node_Str");
    return ponysay.importPony();
  }
  finally {
    System.setIn(stdin);
  }
}