builder.add("bar");
    RegularImmutableList<String> list = (RegularImmutableList<String>) builder.build();
    builder.add("baz");
    assertTrue(list.array != builder.contents);
  }

  @SuppressWarnings("ModifiedButNotUsed")
  @GwtIncompatible // actually allocates nCopies
  @J2ktIncompatible // actually allocates nCopies
  public void testAddOverflowCollection() {
    ImmutableList.Builder<String> builder = ImmutableList.builder();

  @SuppressWarnings("InlineMeInliner")
  public void testAsList() {
    ImmutableList<String> list = ImmutableList.of("a", "b");
    assertThat(list.asList()).isSameInstanceAs(list);
  }

  @SuppressWarnings("ModifiedButNotUsed")
  @GwtIncompatible // actually allocates nCopies
  @J2ktIncompatible // actually allocates nCopies
  public void testAddOverflowCollection() {
    ImmutableList.Builder<String> builder = ImmutableList.builder();