*/
    public <T> T execute(Function<WorkResult, T> function) {
        ensureEmptyDirectoriesBeforeExecution();
        List<StashedFile> stashedFiles = stashFilesThatShouldBeDeleted();
        try {
            if (supportsIncrementalCompilationAfterFailure()) {
                spec.setClassBackupDir(backupDirectory);
            }