testProp = new Properties(System.getProperties());
    String override = "test\njava.version : hidden";

    testProp.load(new StringReader(override));

    result = Maps.fromProperties(testProp);
    assertTrue(result.size() > 2);
    assertEquals("", result.get("test"));
    assertEquals("hidden", result.get("java.version"));
    assertNotSame(System.getProperty("java.version"), result.get("java.version"));

    testProp = new Properties(System.getProperties());
    String override = "test\njava.version : hidden";

    testProp.load(new StringReader(override));

    result = Maps.fromProperties(testProp);
    assertTrue(result.size() > 2);
    assertEquals("", result.get("test"));
    assertEquals("hidden", result.get("java.version"));
    assertNotSame(System.getProperty("java.version"), result.get("java.version"));

      smartAssertTrue(inputs, e, intersect(inputs, ImmutableSet.of(doneCancelled)));
    }
  }

  /**
   * {@link Futures#allAsList(Iterable)} or {@link Futures#successfulAsList(Iterable)}, hidden
   * behind a common interface for testing.
   */
  @J2ktIncompatible
  @GwtIncompatible // used only in GwtIncompatible tests
  private interface Merger {

      assertThat(expected).hasMessageThat().isEqualTo("index (-1) must not be negative");
    }
  }

  public void testCheckElementIndex_tooHigh() {
    try {
      Preconditions.checkElementIndex(1, 1);
      fail();
    } catch (IndexOutOfBoundsException expected) {
      assertThat(expected).hasMessageThat().isEqualTo("index (1) must be less than size (1)");
    }
  }

      smartAssertTrue(inputs, e, intersect(inputs, ImmutableSet.of(doneCancelled)));
    }
  }

  /**
   * {@link Futures#allAsList(Iterable)} or {@link Futures#successfulAsList(Iterable)}, hidden
   * behind a common interface for testing.
   */
  @J2ktIncompatible
  @GwtIncompatible // used only in GwtIncompatible tests
  private interface Merger {

      assertThat(expected).hasMessageThat().isEqualTo("index (-1) must not be negative");
    }
  }

  public void testCheckElementIndex_tooHigh() {
    try {
      Preconditions.checkElementIndex(1, 1);
      fail();
    } catch (IndexOutOfBoundsException expected) {
      assertThat(expected).hasMessageThat().isEqualTo("index (1) must be less than size (1)");
    }
  }

      if (declaringClass.getEnclosingConstructor() != null) {
        // Enclosed in a constructor, needs hidden this
        return true;
      }
      Method enclosingMethod = declaringClass.getEnclosingMethod();
      if (enclosingMethod != null) {
        // Enclosed in a method, if it's not static, must need hidden this.
        return !Modifier.isStatic(enclosingMethod.getModifiers());
      } else {