hunk.code_window:   it('should emit one value chosen by a selector', function (done) {
       function callback(datum, cb) {
         cb(null, datum);
       }
       var boundCallback = Observable.bindCallback(callback, null, function (err, datum) { return datum; });
       boundCallback(42)
         .subscribe(function (x) {
           expect(x).toBe(42);
  
hunk.labels: keep keep keep keep keep replace keep keep keep keep
hunk.after_edit:     var boundCallback = Observable.bindCallback(callback, function (err, datum) { return datum; });
  
hunk.file_path: spec/observables/bindCallback-spec.js
hunk.type: replace
file: import {Observable} from '../../Observable';
  import {merge} from '../../operator/merge-static';
  Observable.merge = merge;
  