*     constructor that omits the cause.
   */
  @Deprecated
  protected UncheckedExecutionException() {}

  /**
   * Creates a new instance with the given detail message and no cause.
   *
   * @deprecated Prefer {@linkplain UncheckedExecutionException(String, Throwable)} a constructor
   *     that accepts a cause: Users of this class typically expect for instances to have a non-null

      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(CHECKED_EXCEPTION, expected.getCause());
    }
  }

  public void testGetUnchecked_ExecutionExceptionUnchecked() {
    try {
      getUnchecked(FAILED_FUTURE_UNCHECKED_EXCEPTION);
      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(UNCHECKED_EXCEPTION, expected.getCause());

      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(CHECKED_EXCEPTION, expected.getCause());
    }
  }

  public void testGetUnchecked_ExecutionExceptionUnchecked() {
    try {
      getUnchecked(FAILED_FUTURE_UNCHECKED_EXCEPTION);
      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(UNCHECKED_EXCEPTION, expected.getCause());

    checkNotNull(callable);
    checkNotNull(timeoutUnit);
    try {
      return callable.call();
    } catch (RuntimeException e) {
      throw new UncheckedExecutionException(e);
    } catch (Exception e) {
      restoreInterruptIfIsInterruptedException(e);
      throw new ExecutionException(e);
    } catch (Error e) {
      throw new ExecutionError(e);
    }
  }

   * from the underlying computation in an {@code UncheckedExecutionException} or {@code
   * ExecutionError}.
   *
   * <p>For an uninterruptible {@code get} that preserves other exceptions, see {@link
   * Uninterruptibles#getUninterruptibly(Future)}.
   *
   * @throws UncheckedExecutionException if {@code get} throws an {@code ExecutionException} with an
   *     {@code Exception} as its cause

 * ExecutionException}, the error's {@linkplain #getCause() cause} comes from a failed task,
 * possibly run in another thread. That cause should itself be an {@code Error}; if not, use {@code
 * ExecutionException} or {@link UncheckedExecutionException}. This allows the client code to
 * continue to distinguish between exceptions and errors, even when they come from other threads.
 *
 * @author Chris Povirk
 * @since 10.0
 */
@GwtCompatible

import com.google.common.cache.AbstractCache.StatsCounter;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.ExecutionError;
import com.google.common.util.concurrent.UncheckedExecutionException;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.HashMap;

      Throwable cause, Class<X> exceptionClass) throws X {
    if (cause instanceof Error) {
      throw new ExecutionError((Error) cause);
    }
    if (cause instanceof RuntimeException) {
      throw new UncheckedExecutionException(cause);
    }
    throw newWithCause(exceptionClass, cause);
  }

  /*
   * TODO(user): FutureChecker interface for these to be static methods on? If so, refer to it in

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import com.google.common.util.concurrent.UncheckedExecutionException;
import com.google.common.util.concurrent.Uninterruptibles;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.concurrent.GuardedBy;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import com.google.common.util.concurrent.UncheckedExecutionException;
import com.google.common.util.concurrent.Uninterruptibles;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.concurrent.GuardedBy;