hunk.code_window: import { MonoTypeOperatorFunction } from '../types';
   import { operate } from '../util/lift';
   import { Subscription } from '../Subscription';
   import { EMPTY } from '../observable/empty';
   import { OperatorSubscriber } from './OperatorSubscriber';
  
hunk.labels: keep keep keep replace keep
hunk.file_path: src/internal/operators/retry.ts
hunk.type: replace
file: export function identity<T>(x: T): T {
    return x;
  }
  