assert(keywords != null);
next.put(Keywords.keywordsKey, keywords);
JavaCompiler oldCompiler = JavaCompiler.instance(context);
JavaCompiler nextCompiler = JavaCompiler.instance(next);
nextCompiler.initRound(oldCompiler);
JavacTaskImpl task = context.get(JavacTaskImpl.class);
if (task != null) {
next.put(JavacTaskImpl.class, task);
task.updateContext(next);