Using gulp.src as a writable passthrough?

As per the changelog and lots of other stuff (1, 2, 3), I'm under the impression I should be able to do this:

gulp.task('js', function(){
    gulp.src('js/*')
        .pipe(uglify())
        .pipe(gulp.src([
            'lib/jquery/dist/jquery.min.js',
            'lib/canjs/can.jquery.min.js',
            'lib/bootstrap/dist/bootstrap.min.js',
            'lib/momentjs/min/moment.min.js'
        ]))
        .pipe(concat('app.js'))
        .pipe(gulp.dest('build'));
});

Trying to first pull my code, minify, add lib files, concat all, and write. I don't want to be uglify-ing all these lib files that have already been minified.

I think I'm up to date.

$ gulp -v
[15:11:30] CLI version 3.8.0
[15:11:30] Local version 3.8.6

Has anyone gotten this to work?