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original.java

public ImmutableSet<ClassInfo> getClasses(Package pkg) {
  return getClasses(pkg.getName());
}

modified.java

public ImmutableSet<ClassInfo> getClassesRecursive(String packageName) {
  checkNotNull(packageName);
  String packagePrefix = packageName + '.';
  ImmutableSet.Builder<ClassInfo> builder = ImmutableSet.builder();
  for (ClassInfo classInfo : classes) {
    if (classInfo.getName().startsWith(packagePrefix)) {
      builder.add(classInfo);
    }
  }
  return builder.build();
}