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An extension for the Truth test assertion framework supporting Protocol Buffers.

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package com.google.common.truth.extensions.proto;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableListMultimap;
import com.google.errorprone.annotations.concurrent.LazyInit;
import com.google.protobuf.Message;
import java.lang.Integer;
import java.lang.Iterable;
import java.lang.Override;
import java.lang.SuppressWarnings;

final class AutoValue_DiffResult extends $AutoValue_DiffResult {
  @LazyInit
  @SuppressWarnings("Immutable")
  private transient volatile Iterable childEntities;

  AutoValue_DiffResult(Message actual, Message expected,
      ImmutableListMultimap singularFields,
      ImmutableListMultimap repeatedFields,
      Optional unknownFields) {
    super(actual, expected, singularFields, repeatedFields, unknownFields);
  }

  @Override
  Iterable childEntities() {
    if (childEntities == null) {
      synchronized (this) {
        if (childEntities == null) {
          childEntities = super.childEntities();
          if (childEntities == null) {
            throw new NullPointerException("childEntities() cannot return null");
          }
        }
      }
    }
    return childEntities;
  }
}