fail("An IllegalArgumentException was expected");
} catch (IllegalArgumentException ignored) {
}
assertThat(struct.isFrozen(), is(false));
struct = struct.frozenCopy();
assertThat(struct.isFrozen(), is(true));
assertThat(struct.copy().isFrozen(), is(false));
try {
struct.set("name", "John");
fail("An IllegalStateException was expected");