Bug 120585 [clean up] needs two invocations until all clean ups are performed
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/quickfix/CleanUpTest.java
if (result == null) {
			
			ASTParser parser= ASTParser.newParser(ASTProvider.AST_LEVEL);
			parser.setSource(compilationUnit);
			parser.setResolveBindings(true);
			result= (CompilationUnit) parser.createAST(null);
		}
		return result;
	}
	
	private void setOptions(ICleanUp fix) {
		setOptions(new ICleanUp[] {fix});
	}
	
	private void setOptions(ICleanUp[] fixes) {
		Hashtable options= JavaCore.getOptions();
		for (Iterator iter= options.keySet().iterator(); iter.hasNext();) {
			String key= (String)iter.next();
			String value= (String)options.get(key);
			if ("error".equals(value) || "warning".equals(value)) {  
				options.put(key, "ignore"); 
			}
		}
		
		for (int i= 0; i < fixes.length; i++) {
			ICleanUp fix= fixes[i];
			Map fixOptions= fix.getRequiredOptions();
			if (fixOptions != null) {
				options.putAll(fixOptions);
			}