private List fecthConvertingProposal(StringBuffer buf, ICompilationUnit cu) {
private List fecthConvertingProposal(StringBuffer buf, ICompilationUnit cu) throws Exception {
	private List fecthConvertingProposal(StringBuffer buf, ICompilationUnit cu) {		int offset= buf.toString().indexOf("for");		AssistContext context= getCorrectionContext(cu, offset, 0);		List proposals= collectAssists(context, false);		for (Iterator it= proposals.iterator(); it.hasNext();) {			CUCorrectionProposal proposal= (CUCorrectionProposal)it.next();			if (proposal instanceof ConvertForLoopProposal) {				fConvertLoopProposal= (ConvertForLoopProposal)proposal;			}		}		return proposals;	}