Program: 83908
Project: 83908
Buggy source:
@Override public int getSignatureMatch(String name,IValue instance,List<IValue> arguments){
  if (name == null) {
    return 1;
  }
  if (!name.equals(this.qualifiedName)) {
    return 0;
  }
  if (arguments == null) {
    return 1;
  }
  int pOff=0;
  int match=1;
  int len=arguments.size();
  List<Parameter> params=this.parameters;
  if (instance != null && (this.modifiers & Modifiers.INFIX) == Modifiers.INFIX) {
    if (len != params.size() - 1) {
      return 0;
    }
    IType t2=params.get(0).type;
    int m=instance.getTypeMatch(t2);
    if (m == 0) {
      return 0;
    }
    match+=m;
    pOff=1;
  }
 else   if ((this.modifiers & Modifiers.VARARGS) != 0) {
    int parCount=this.parameters.size() - 1;
    if (len <= parCount) {
      return 0;
    }
    Parameter varParam=params.get(parCount);
    for (int i=0; i < len; i++) {
      Parameter par=(i > parCount ? varParam : params.get(i + pOff));
      IType t1=par.type;
      IValue argument=arguments.get(i);
      int m=argument.getTypeMatch(t1);
      if (m != 0) {
        return match + m;
      }
      m=argument.getTypeMatch(t1.getElementType());
      if (m == 0) {
        return 0;
      }
      match+=m;
    }
    return match;
  }
 else   if (len != this.parameters.size()) {
    return 0;
  }
  for (int i=0; i < len; i++) {
    IType t1=params.get(i + pOff).type;
    IValue argument=arguments.get(i);
    int m=argument.getTypeMatch(t1);
    if (m == 0) {
      return 0;
    }
    match+=m;
  }
  return match;
}

Fixed version (ground truth):
@Override public int getSignatureMatch(String name,IValue instance,List<IValue> arguments){
  if (name == null) {
    return 1;
  }
  if (!name.equals(this.qualifiedName)) {
    return 0;
  }
  if (arguments == null) {
    return 1;
  }
  int pOff=0;
  int match=1;
  int len=arguments.size();
  List<Parameter> params=this.parameters;
  int mods=(this.modifiers & Modifiers.INFIX);
  if (instance != null && mods == Modifiers.INFIX) {
    if (len != params.size() - 1) {
      return 0;
    }
    IType t2=params.get(0).type;
    int m=instance.getTypeMatch(t2);
    if (m == 0) {
      return 0;
    }
    match+=m;
    pOff=1;
  }
 else   if (mods == Modifiers.STATIC && instance != null && instance.getValueType() != IValue.CLASS_ACCESS) {
    return 0;
  }
 else   if ((this.modifiers & Modifiers.VARARGS) != 0) {
    int parCount=this.parameters.size() - 1;
    if (len <= parCount) {
      return 0;
    }
    Parameter varParam=params.get(parCount);
    for (int i=0; i < len; i++) {
      Parameter par=(i > parCount ? varParam : params.get(i + pOff));
      IType t1=par.type;
      IValue argument=arguments.get(i);
      int m=argument.getTypeMatch(t1);
      if (m != 0) {
        return match + m;
      }
      m=argument.getTypeMatch(t1.getElementType());
      if (m == 0) {
        return 0;
      }
      match+=m;
    }
    return match;
  }
 else   if (len != this.parameters.size()) {
    return 0;
  }
  for (int i=0; i < len; i++) {
    IType t1=params.get(i + pOff).type;
    IValue argument=arguments.get(i);
    int m=argument.getTypeMatch(t1);
    if (m == 0) {
      return 0;
    }
    match+=m;
  }
  return match;
}