Program: 53386
Project: 53386
Buggy source:
public boolean castFailsTrivially(JReferenceType fromType,JReferenceType toType){
  if (!fromType.canBeNull() && toType.isNullType()) {
    return true;
  }
  if (!fromType.canBeSubclass() && fromType.getUnderlyingType() instanceof JClassType && fromType.getUnderlyingType() != toType.getUnderlyingType() && !isSuperClass(fromType,toType) && !implementsInterface(fromType,toType)) {
    return true;
  }
  fromType=fromType.getUnderlyingType();
  toType=toType.getUnderlyingType();
  if (fromType == toType || isJavaLangObject(fromType)) {
    return false;
  }
  if (canCrossCastLikeJso(fromType) && canCrossCastLikeJso(toType)) {
    return false;
  }
  if (castSucceedsTrivially(fromType,toType)) {
    return false;
  }
  if (fromType instanceof JArrayType) {
    JArrayType fromArrayType=(JArrayType)fromType;
    if (toType instanceof JArrayType) {
      JArrayType toArrayType=(JArrayType)toType;
      JType fromLeafType=fromArrayType.getLeafType();
      JType toLeafType=toArrayType.getLeafType();
      int fromDims=fromArrayType.getDims();
      int toDims=toArrayType.getDims();
      if (fromDims < toDims && !isJavaLangObject(fromLeafType) && !fromLeafType.isNullType()) {
        return true;
      }
      if (fromDims == toDims && fromLeafType instanceof JReferenceType && toLeafType instanceof JReferenceType) {
        return castFailsTrivially((JReferenceType)fromLeafType,(JReferenceType)toLeafType);
      }
    }
  }
 else   if (fromType instanceof JClassType) {
    JClassType cType=(JClassType)fromType;
    if (toType instanceof JClassType) {
      return !isSubClass(cType,(JClassType)toType);
    }
 else     if (toType instanceof JInterfaceType) {
      return !potentialInterfaceByClass.containsEntry(cType.getName(),toType.getName());
    }
  }
 else   if (fromType instanceof JInterfaceType) {
    JInterfaceType fromInterfaceType=(JInterfaceType)fromType;
    if (toType instanceof JClassType) {
      return !potentialInterfaceByClass.containsEntry(toType.getName(),fromInterfaceType.getName());
    }
  }
  return false;
}

Fixed version (ground truth):
public boolean castFailsTrivially(JReferenceType fromType,JReferenceType toType){
  if (!fromType.canBeNull() && toType.isNullType()) {
    return true;
  }
  if (isJsInteropCrossCastTarget(toType.getUnderlyingType())) {
    return false;
  }
  if (!fromType.canBeSubclass() && fromType.getUnderlyingType() instanceof JClassType && fromType.getUnderlyingType() != toType.getUnderlyingType() && !isSuperClass(fromType,toType) && !implementsInterface(fromType,toType)) {
    return true;
  }
  fromType=fromType.getUnderlyingType();
  toType=toType.getUnderlyingType();
  if (fromType == toType || isJavaLangObject(fromType)) {
    return false;
  }
  if (canCrossCastLikeJso(fromType) && canCrossCastLikeJso(toType)) {
    return false;
  }
  if (castSucceedsTrivially(fromType,toType)) {
    return false;
  }
  if (fromType instanceof JArrayType) {
    JArrayType fromArrayType=(JArrayType)fromType;
    if (toType instanceof JArrayType) {
      JArrayType toArrayType=(JArrayType)toType;
      JType fromLeafType=fromArrayType.getLeafType();
      JType toLeafType=toArrayType.getLeafType();
      int fromDims=fromArrayType.getDims();
      int toDims=toArrayType.getDims();
      if (fromDims < toDims && !isJavaLangObject(fromLeafType) && !fromLeafType.isNullType()) {
        return true;
      }
      if (fromDims == toDims && fromLeafType instanceof JReferenceType && toLeafType instanceof JReferenceType) {
        return castFailsTrivially((JReferenceType)fromLeafType,(JReferenceType)toLeafType);
      }
    }
  }
 else   if (fromType instanceof JClassType) {
    JClassType cType=(JClassType)fromType;
    if (toType instanceof JClassType) {
      return !isSubClass(cType,(JClassType)toType);
    }
 else     if (toType instanceof JInterfaceType) {
      return !potentialInterfaceByClass.containsEntry(cType.getName(),toType.getName());
    }
  }
 else   if (fromType instanceof JInterfaceType) {
    JInterfaceType fromInterfaceType=(JInterfaceType)fromType;
    if (toType instanceof JClassType) {
      return !potentialInterfaceByClass.containsEntry(toType.getName(),fromInterfaceType.getName());
    }
  }
  return false;
}