void (@NotNull Project project, @NotNull PsiFile file, @Nullable Editor editor, @NotNull PsiElement startElement, @NotNull PsiElement endElement) { RefactoringActionHandler handler = LanguageRefactoringSupport.INSTANCE.forLanguage(JavaLanguage.INSTANCE).getIntroduceVariableHandler(); assert handler != null; ((JavaIntroduceVariableHandlerBase)handler).invoke(project, editor, (PsiExpression)startElement); }