private SuppressedWarnings getSuppressedWarnings() {
    if (suppressedWarnings == null) {
      suppressedWarnings =
          SuppressedWarnings.forElement(
              element,
              style().generateSuppressAllWarnings(),
              hasDeprecatedAttributes());
    }
    return suppressedWarnings;
  }
Means object hashcode is cached at some point. Either lazily (on first access)
or eagerly (during construction).
@see #isUseLazyhash()
@see #isUsePrehashed()
value-processor/src/org/immutables/value/processor/meta/ValueType.java