@Override
  public int count(@Nullable Object element) {
    throw new AssertionError();
  }

  @Override
  public ImmutableSet<E> elementSet() {
    throw new AssertionError();
  }

  @Override
  Entry<E> getEntry(int index) {
    throw new AssertionError();
  }

  @Override
  boolean isPartialView() {
    throw new AssertionError();
  }

  @Override
  public int size() {

      try {
        output.write(b);
      } catch (IOException impossible) {
        throw new AssertionError(impossible);
      }
    }

    @Override
    public void write(byte[] b) {
      try {
        output.write(b);
      } catch (IOException impossible) {
        throw new AssertionError(impossible);
      }
    }

    @Override
    public void write(byte[] b, int off, int len) {

          @Override
          public Integer computeNext() {
            if (haveBeenCalled) {
              throw new AssertionError("Should not have been called again");
            } else {
              haveBeenCalled = true;
              sneakyThrow(new SomeCheckedException());
              throw new AssertionError(); // unreachable
            }
          }
        };

        BoundType boundType, DiscreteDomain<Comparable<?>> domain) {
      throw new AssertionError("this statement should be unreachable");
    }

    @Override
    void describeAsLowerBound(StringBuilder sb) {
      sb.append("(-\u221e");
    }

    @Override
    void describeAsUpperBound(StringBuilder sb) {
      throw new AssertionError();
    }

    @Override

          @Override
          public Integer computeNext() {
            if (haveBeenCalled) {
              throw new AssertionError("Should not have been called again");
            } else {
              haveBeenCalled = true;
              sneakyThrow(new SomeCheckedException());
              throw new AssertionError(); // unreachable
            }
          }
        };

    // The first time, the sneakily-thrown exception comes out

          @Override
          public Integer computeNext() {
            if (haveBeenCalled) {
              throw new AssertionError("Should not have been called again");
            } else {
              haveBeenCalled = true;
              sneakyThrow(new SomeCheckedException());
              throw new AssertionError(); // unreachable
            }
          }
        };

    // The first time, the sneakily-thrown exception comes out

        break;
      case LAST_BEFORE:
        if (list.contains(key)) {
          assertEquals(list.indexOf(key) - 1, answer);
          return;
        }
        break;
      default:
        throw new AssertionError();
    }
    // key is not present
    int nextHigherIndex = list.size();
    for (int i = list.size() - 1; i >= 0 && list.get(i) > key; i--) {
      nextHigherIndex = i;
    }
    switch (absentBehavior) {

        }
      }
    };
  }

  /** Alternative to AssertionError(String, Throwable), which doesn't exist in Java 1.6 */
  private static AssertionError newAssertionError(String message, Throwable cause) {
    AssertionError e = new AssertionError(message);
    e.initCause(cause);
    return e;
  }

      future.cancel(true /* mayInterruptIfRunning */);
      throw e;
    } catch (ExecutionException e) {
      wrapAndThrowExecutionExceptionOrError(e.getCause());
      throw new AssertionError();
    }
  }

  @CanIgnoreReturnValue
  @Override
  @ParametricNullness
  public <T extends @Nullable Object> T callUninterruptiblyWithTimeout(

  // TODO(dpb): Use Expect once that supports JUnit 3, or we can use JUnit 4.
  final List<AssertionError> failures = new ArrayList<>();
  final StandardSubjectBuilder expect =
      StandardSubjectBuilder.forCustomFailureStrategy(
          new FailureStrategy() {
            @Override
            public void fail(AssertionError failure) {
              failures.add(failure);
            }
          });