public static RefactoringStatusContext create(ICompilationUnit cunit) { return create(cunit, (ISourceRange)null);
public static RefactoringStatusContext create(IMember member) { if (member == null || !member.exists()) return null; return new MemberSourceContext(member);
	public static RefactoringStatusContext create(ICompilationUnit cunit) {		return create(cunit, (ISourceRange)null);	}