hunk.code_window:  * @param {function(value: T, ?index: number): ObservableInput} project A function
    * that, when applied to an item emitted by the source Observable, returns an
    * Observable.
    * @return {Observable} An Observable that emits the result of applying the
    * projection function (and the optional `resultSelector`) to each item emitted
    * by the source Observable and taking values from each projected inner
    * Observable sequentially.
    * @method concatMap
    * @owner Observable
  
hunk.labels: keep keep keep keep replace keep keep keep keep
hunk.after_edit:  * projection function (and the optional deprecated `resultSelector`) to each item emitted
  
hunk.file_path: src/internal/operators/concatMap.ts
hunk.type: replace
file: export * from 'rxjs-compat/util/tryCatch';
  