}
    }

    private static ImmutableList<String> collectChanges(ChangeContainer changes) {
        ImmutableList.Builder<String> builder = ImmutableList.builder();
        MessageCollectingChangeVisitor visitor = new MessageCollectingChangeVisitor(builder, ExecutionStateChangeDetector.MAX_OUT_OF_DATE_MESSAGES);
        changes.accept(visitor);
        return builder.build();
    }