if (!(fCu instanceof CompilationUnit)) return RefactoringStatus.createFatalErrorStatus("Internal Error");  initializeAST();
if (!(fCu instanceof CompilationUnit)) return RefactoringStatus.createFatalErrorStatus("Internal Error"); pm.worked(1);  initializeAST();
	public RefactoringStatus checkActivation(IProgressMonitor pm) throws JavaModelException {		if (fSelectionStart < 0)			return RefactoringStatus.createFatalErrorStatus("An expression must be selected to activate this refactoring");				if (!(fCu instanceof CompilationUnit))			return RefactoringStatus.createFatalErrorStatus("Internal Error");			initializeAST();				return checkSelection();	}