Code example for Closer

         * It ensures that suppressed exceptions from the Closeables are 
         * handled correctly. 
         */ 
        try { 
            try { 
                throw _closer.rethrow(exc, Exception.class);
            } finally { 
                _closer.close();
            } 
        } catch (Throwable t) {
            fail(t, attachment);
        } 
    } 
 
    private void fail(Throwable t, A attachment)
    { 
        try { 
            onFailure(t, attachment);
        } catch (Exception replacement) {
            if (replacement.getCause() == t) {