Program: 136131
Project: 136131
Buggy source:
public final boolean levelCheck(int itr){
  if (this.levelChecked >= itr)   return this.levelCorrect;
  this.levelChecked=itr;
  this.levelCorrect=true;
  if (!this.body.levelCheck(itr)) {
    this.levelCorrect=false;
  }
  for (int i=0; i < this.substs.length; i++) {
    if (!this.getSubWith(i).levelCheck(itr)) {
      this.levelCorrect=false;
    }
  }
  this.level=this.body.getLevel();
  HashSet lpSet=this.body.getLevelParams();
  for (int i=0; i < this.substs.length; i++) {
    if (lpSet.contains(this.getSubFor(i))) {
      this.level=Math.max(level,this.getSubWith(i).getLevel());
    }
  }
  Iterator iter=lpSet.iterator();
  while (iter.hasNext()) {
    Object param=iter.next();
    this.levelParams.addAll(Subst.paramSet(param,this.substs));
  }
  this.allParams=this.body.getAllParams();
  this.nonLeibnizParams=this.body.getNonLeibnizParams();
  for (int i=0; i < this.substs.length; i++) {
    OpDeclNode param=substs[i].getOp();
    if (this.allParams.contains(param)) {
      this.allParams.remove(param);
      this.allParams.addAll(substs[i].getExpr().getAllParams());
      this.nonLeibnizParams.addAll(substs[i].getExpr().getNonLeibnizParams());
      if (this.nonLeibnizParams.contains(param)) {
        this.nonLeibnizParams.remove(param);
        this.nonLeibnizParams.addAll(substs[i].getExpr().getAllParams());
      }
      ;
    }
    ;
  }
  ;
  boolean isConstant=this.instantiatedModule.isConstant();
  this.levelConstraints=Subst.getSubLCSet(this.body,this.substs,isConstant,itr);
  this.argLevelConstraints=Subst.getSubALCSet(this.body,this.substs,itr);
  this.argLevelParams=Subst.getSubALPSet(this.body,this.substs);
  return this.levelCorrect;
}

Fixed version (ground truth):
public final boolean levelCheck(int itr){
  if (this.levelChecked >= itr)   return this.levelCorrect;
  this.levelChecked=itr;
  this.levelCorrect=true;
  if (!this.body.levelCheck(itr)) {
    this.levelCorrect=false;
  }
  for (int i=0; i < this.substs.length; i++) {
    if (!this.getSubWith(i).levelCheck(itr)) {
      this.levelCorrect=false;
    }
  }
  this.level=this.body.getLevel();
  HashSet lpSet=this.body.getLevelParams();
  for (int i=0; i < this.substs.length; i++) {
    if (lpSet.contains(this.getSubFor(i))) {
      this.level=Math.max(level,this.getSubWith(i).getLevel());
    }
  }
  Iterator iter=lpSet.iterator();
  while (iter.hasNext()) {
    Object param=iter.next();
    this.levelParams.addAll(Subst.paramSet(param,this.substs));
  }
  this.allParams=(HashSet)this.body.getAllParams().clone();
  this.nonLeibnizParams=(HashSet)this.body.getNonLeibnizParams().clone();
  for (int i=0; i < this.substs.length; i++) {
    OpDeclNode param=substs[i].getOp();
    if (this.allParams.contains(param)) {
      this.allParams.remove(param);
      this.allParams.addAll(substs[i].getExpr().getAllParams());
      this.nonLeibnizParams.addAll(substs[i].getExpr().getNonLeibnizParams());
      if (this.nonLeibnizParams.contains(param)) {
        this.nonLeibnizParams.remove(param);
        this.nonLeibnizParams.addAll(substs[i].getExpr().getAllParams());
      }
      ;
    }
    ;
  }
  ;
  boolean isConstant=this.instantiatedModule.isConstant();
  this.levelConstraints=Subst.getSubLCSet(this.body,this.substs,isConstant,itr);
  this.argLevelConstraints=Subst.getSubALCSet(this.body,this.substs,itr);
  this.argLevelParams=Subst.getSubALPSet(this.body,this.substs);
  return this.levelCorrect;
}