this.cause = cause; return this; }
	public synchronized Throwable initCause(Throwable cause) {	    if (cause == this)		throw new IllegalArgumentException ();	    if (containedException != null)		throw new IllegalStateException ();	    containedException = cause;	    causeKnown = true;// FIXME: spec implies "this" may be the right value; another bug?	    return cause;	}